The 24VAC iComfort Wi‐Fi® thermostat is an electronic communicating, color display touchscreen and 7-day programmable thermostat. It stores system parameters and settings in non-volatile memory (i.e., it retains data when electrical power fails or is turned off).
The iComfort Wi‐Fi® thermostat can connect to online services via the Internet through the homeowner’s Wi-Fi access point. After online registration is completed, the system may then be accessed by the homeowner from anywhere using a remote Internet connection via computer or personal communicating device.
Refer to page 37 for information on making connections to the thermostat.
This thermostat supports:
During initial thermostat start-up the following screen will appear (see figure )This indicates that the thermostat is active and booting up.
During initial thermostat start-up if the following screen appears (see figure 2), this will indicate that the thermostat has been incorrectly wired or has shorted wires. Turn power off to the system and verify that all wiring is correct.
Use the arrows to select Time and Date; touch edit to proceed to the “Set current time and date” screen.
When “Time and Date” screen appears, enter the correct date as follows:
“Circulate” is enabled on the user’s home screen or system settings page.
It keeps air circulating from 15% to 50% percent of time. The following settings approximate how long the fan will run at these typical settings:
NOTE – If the circulate fan mode is on, a timer is set to measure all the time that the fan is blowing, regardless if it is running to deliver heating or cooling or just for air circulation.
Either the dealer number or phone number is required. Once either number is entered, all other fields will automatically be populated once the thermostat has been registered during the Wi-FI setup procedure later on in this instruction (if the dealer has an account with Lennox already).
NOTE – Dealer number is the dealer’s Lennox account number. Dealer phone number is the dealer’s main office phone number.
The following table lists all of the installer configurable system level parameters available from the installer setup screens. After adjusting system settings, select next to continue.
Table 1. System Settings
Parameter Name | Default | Parameter Value Setting | Increment |
Time and Date | — | (Time/date elements screen) | — |
Daylight Saving Time | Enabled | Enabled, Disabled | — |
Circulate Fan ON Time | 35% | Range 15 to 45% | 1% |
Temperature Unit | Fahrenheit | Fahrenheit or Celsius | — |
System Name | — | (keyboard input screen) | — |
Dealer Number Dealer Name Dealer Address Dealer Phone Dealer Email Dealer Website | **** | (keyboard input screen) Note: When adding the dealer number, all other dealer fields will auto populate once thermostat registra tion is completed. | — |
Lennox | — | ||
— | — | ||
1-800-9-LENNOX | — | ||
— | — | ||
www.lennox.com | — |
NOTE – NEVER USE A HOME GUEST ACCOUNT.
NOTE – NEVER USE A OPEN ROUTER CONNECTION (NON-SECURE).
NOTE – ALWAY USE A SECURE CONNECTION PHYSICALLY LOCATED IN THE HOME THAT THE THERMOSTAT IS BEING SETUP IN.
Check the router utility program or contact service provider for help.
When determining the location for the Wi-Fi thermostat, be sure it is in an area near enough to the home Wi-Fi router to ensure good communications signal strength between the thermostat and the Wi-Fi router. (Hint: Use a smart phone with Wi-Fi and Wi-Fi finder application to locate and determine optimal location based on router Wi-Fi signal strength.) NOTE – Thermostat will not be able to reliably connect to a router if the received signal strength indicator (RSSI) is -70 or greater. NOTE – Correct the cause of any alerts prior to continuing setup. Secure Connection Recommended! Verify the home Wi-Fi router supports at least one of the supports wireless bands (802.11b, g or n). Check router utility program or contact service provider for assistance.
To enable the Wi-Fi feature to communicate with a wireless router
There are two methods to setup your Wi-Fi connection. Select either NETWORK SETTINGS or connection status.
Method 1 — Network Settings Method
Method 2 — Connection Status Method
ROUTER / MODEM CHECK IF CONNECTION FAILS
After connecting to your router, you can check your signal strength by pushing the Wi-Fi icon on the home screen, then the networks button, then your network button, then the AP info button (see figure 10). A strong wireless signal (RSSI) is indicated by a NEGATIVE decibel number in the range from -46 to -58db; anything greater than -80db will not connect. If you are connected but have a signal above -70db then you may consider adding a signal repeater/extender or making some of the other router adjustment mentioned in the Router / Modem Check section.
NOTE – This following information is customer setup instructions and is shown here to allow the installer to help walk the customer through the setup process.
After registering through your iComfort Wi‐Fi® thermostat interface, go to the homeowner’s computer and locate the email sent from the server.
NOTE – if the customer has already setup an account, click the “Click Here” button to access that account.
Click on the Register link; the screen (to the left) will appear. Fill in the User Name and Password fields and check the agree to terms and conditions box. Click Create User button.
A series of pages and prompts follows to provide guidance through profile setup and user preference definitions.
To add (or remove) an outdoor unit that is not iComfort®-enabled, you must be at the “Add or Remove Non-communicating equipment?” screen.
ADDING A HUMIDIFIER
Before adding a humidifier, be sure that the:
To add (or remove) a humidifier:
Before adding a dehumidifier, be sure that:
To add (or remove) a dehumidifier, you must be at the “Add or Remove Non-communicating equipment?” screen.
Pre-adjustment REQUIREMENTS:
HEATING MODE (XP25 ONLY) — CLIMATE IQ™
This technology optimizes dehumidification settings for specific climates to improve home comfort during cooling or heating operations.
Two climate settings are available:
COOLING MODE — CLIMATE IQ™
Three climate settings are available:
Pre-adjustment REQUIREMENTS:
Configure the device as follows:
How Humidification Mode Works
DISPLAY, BASIC AND PRECISION—These modes allow user control of relative humidity between 15 and 45%. These conditions must be met for either mode to operate:
PRECISION—Outdoor temperature sensor is required.
Basic Dew Point Control adjustment mode will change the humidification setpoint based on the outdoor temperature and a user-defined dew point adjustment setting.
Precision Dew Point Control adjustment mode will operate when these conditions are met:
Pre-adjustment REQUIREMENTS
DEHUMIDIFICATION SETTINGS — FEATURE SCREEN
HOW DEHUMIDIFICATION MODE WORK — NO EXTERNAL DEHUMIDIFICATION DEVICE
NOTE – OFF, MEDIUM and HIGH dehumidification modes are also a function of the HVAC system with NO external dehumidification devices installed.
In OFF mode, dehumidification if off.
In MEDIUM mode, dehumidification occurs if these conditions are met and signals are present at specific terminals:
In HIGH mode, dehumidification occurs if all BASIC conditions are true, except cooling demand may or may not be present. Also note that:
AUXILIARY DEHUMIDIFIER — COMMUNICATING OR NON-COMMUNICATING OUTDOOR UNITS
Control State | Conditions |
Auxiliary dehumidification is controlled by iComfort® thermostat with or without zoning. | • System must be in cooling mode and have a call for dehumidification from the iComfort® thermostat. This will start the auxiliary dehumidifier. • A separate wire from auxiliary dehumidifier will need to be run to G terminal on indoor unit control to start the blower. |
Auxiliary dehumidification is con trolled by dehumidification con trol with or without zoning | Needs a dehumidification demand from the stand-alone dehumidification thermo stat and a separate wire run to G terminal on indoor unit to start the blower. |
NOTE – Skip if no zoning control device is installed.
When cooling demand is terminated, a 5 minute minimum off time delay is initiated.
Second-stage cooling is energized when the discharge air temperature is 7°F higher than the setpoint of the cooling staging temperature jumper.
Heating Operation Conventional Heat/Cool and Heat Pump Systems
When a in-zone thermostat makes a demand for heating, the zone damper opens and heating equipment begins operating. Heating demand is terminated when:
When heating demand is terminated, a 5minute minimum off time delay is initiated. Second-stage heating is energized if the discharge air temperature is lower than the setpoint of the heating staging temperature setpoint.
Adjustment to all air flows can be made either at the System Devices > System screen or using the Edit and Test Airflow per Zone screen .The following procedure is to adjust individual zone airflow (CFM) for Blower Circulation, Cooling and Heating airflow.
NOTE – The airflow per zone (in red) must be selected and verified before continuing.
Use the following procedure to run test for various heating and cooling stage operations.
The tests feature is available after setup has been completed once. After you touch next in the final setup screen, the “select tests to run” screen (figure 18) will appear. (If you want you may skip tests; touch skip tests.) To run all of the tests, touch select all. All boxes in the list of tests will be checked. Or, touch box(es) next to test(s) to run certain tests. After the tests have been started, the screen will describe which test is running and shows a diagnostic summary of each test (see figure 19). After reviewing the results and concluding that no further tests are needed, touch next to proceed to next test. The technician must verify that the test procedure is producing the desired result at the equipment. After pressing next after the final test, the Testing finished screen will appear (figure 20). At this point, use the EXIT button (if you have completed the required setup), or use the diagnostics button (to analyze the system), or use equipment button (if you wish to make any changes to device details).
Touch confirm to continue system configuration; the screen will change to the system discovery screen. At this point, the program goes through the same setup as the initial setup process which begins on page 3.
NOTE – “Compatible device found” screen (shown below) appears only when a device has been removed and replaced with a compatible device.
Missing:Found Compatible
Device Equipment Type No:Device Equipment Type No.
Model No. (control model no.)Model No. (control model no.)
Serial No. (control serial no.):Serial No. (control serial no.)
Settings were not copied
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
10 | Critical | (Thermostat) The thermostat has found an unknown device on the system. | An unknown device is seen on the subnet in or outside of configuration mode. Clear by reconfiguring the system. Touch the setup tab, touch start, and touch confirm. If problem persists, then check all DEVICE connections to make sure they are iComfort®compatible. |
11 | Critical | (Thermostat) The thermostat cannot find a previously installed unit. | Check all connections and cycle system power. If problem persists, clear by reconfiguring the system. Press the setup tab, touch start, and touch confirm. If problem persists, then check all DEVICE connections to make sure they are iComfort®compatible. |
12 | Critical | (Thermostat) The thermostat cannot find an iComfort®enabled indoor unit. | Thermostat did not find an Indoor Unit. Make sure there is an iComfort® indoor unit on the system. Check R, i+, i and C connections, ohm wires and cycle power. Replace indoor unit control board if there is no response. |
14 | Critical | (Thermostat) The thermostat found more than one thermostat, more than one indoor unit, or more than one outdoor unit on the system. | Check wiring and remove duplicate equipment. Reconfigure system. |
18 | Minor | (Thermostat) The outside temperature is be low the level where the heat pump is pro grammed to heat the home. The system will not use the heat pump to warm your home. | Notification only Outdoor Temp is below the Low Balance Point. Heat Pump will not be used to service a heating demand. |
19 |
Minor | (Thermostat) The outside temperature is higher than the level where the furnace or electric heat is programmed to work. The system will only use the heat pump to warm your home. | Notification only Outdoor Temp is above the High Balance Point. Indoor Unit (furnace or airhandler) will not be used to service a heating demand. |
29 |
Critical | (Thermostat) The thermostat is reading an indoor temperature that is higher than 99ºF. The thermostat will not allow any heating op eration to begin until it senses a temperature lower than 99ºF. | Indoor temperature rose above 99ºF during a heating or cooling demand. Heating opera tion is not allowed. Check to ensure that Heating Equipment is not stuck ON (reversing valve, etc.). Check the accuracy of the thermostat temperature sensor. Select cooling system mode to cool the indoor space. |
30 |
Moderate | (Thermostat) The thermostat is reading an indoor temperature that is lower than 40ºF. The thermostat will not allow any cooling op eration to begin until it senses a temperature higher than 40ºF. | Indoor Temp fell below 40ºF. Cooling operation is not allowed. Check to ensure that cool ing equipment is not stuck ON. Check accuracy of the thermostat temperature sensor. Select heating system mode to heat the indoor space to above 40ºF. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
10 | Critical | (Thermostat) The thermostat has found an unknown device on the system. | An unknown device is seen on the subnet in or outside of configuration mode. Clear by reconfiguring the system. Touch the setup tab, touch start, and touch confirm. If problem persists, then check all DEVICE connections to make sure they are iComfort®compatible. |
11 | Critical | (Thermostat) The thermostat cannot find a previously installed unit. | Check all connections and cycle system power. If problem persists, clear by reconfiguring the system. Press the setup tab, touch start, and touch confirm. If problem persists, then check all DEVICE connections to make sure they are iComfort®compatible. |
12 | Critical | (Thermostat) The thermostat cannot find an iComfort®enabled indoor unit. | Thermostat did not find an Indoor Unit. Make sure there is an iComfort® indoor unit on the system. Check R, i+, i and C connections, ohm wires and cycle power. Replace indoor unit control board if there is no response. |
14 | Critical | (Thermostat) The thermostat found more than one thermostat, more than one indoor unit, or more than one outdoor unit on the system. | Check wiring and remove duplicate equipment. Reconfigure system. |
18 | Minor | (Thermostat) The outside temperature is be low the level where the heat pump is pro grammed to heat the home. The system will not use the heat pump to warm your home. | Notification only Outdoor Temp is below the Low Balance Point. Heat Pump will not be used to service a heating demand. |
19 |
Minor | (Thermostat) The outside temperature is higher than the level where the furnace or electric heat is programmed to work. The system will only use the heat pump to warm your home. | Notification only Outdoor Temp is above the High Balance Point. Indoor Unit (furnace or airhandler) will not be used to service a heating demand. |
29 |
Critical | (Thermostat) The thermostat is reading an indoor temperature that is higher than 99ºF. The thermostat will not allow any heating op eration to begin until it senses a temperature lower than 99ºF. | Indoor temperature rose above 99ºF during a heating or cooling demand. Heating opera tion is not allowed. Check to ensure that Heating Equipment is not stuck ON (reversing valve, etc.). Check the accuracy of the thermostat temperature sensor. Select cooling system mode to cool the indoor space. |
30 |
Moderate | (Thermostat) The thermostat is reading an indoor temperature that is lower than 40ºF. The thermostat will not allow any cooling op eration to begin until it senses a temperature higher than 40ºF. | Indoor Temp fell below 40ºF. Cooling operation is not allowed. Check to ensure that cool ing equipment is not stuck ON. Check accuracy of the thermostat temperature sensor. Select heating system mode to heat the indoor space to above 40ºF. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
31 | Critical | (Thermostat) The thermostat has lost com munication with the (furnace, airhandler or outdoor unit) for more than 3 minutes. | [Indicated unit] has not communicated with thermostat for more than 3 minutes. Check connections. Ohm wires. If fault persists, then cycle power. Fault clears after communica tion is restored. |
32 |
Moderate |
(Thermostat) The (furnace, airhandler or outdoor unit) is resetting itself. | [Indicated unit] is resetting itself. This event may occur during a power outage or power fluctuation in the system. If persistent or if it coincides with the system operation then proceed with the following steps. Check the power connections, check the amp draw at the transformer (the transformer maybe overloaded) and check 24VAC voltage at the DEVICE. The alarm is only cleared by pressing the clear button on the Installer Alerts Tab. If the fault persists after checking the connections, replace the unit’s control board. |
34 |
Critical | (Thermostat) The thermostat does not know the capacity (tonnage) of the (furnace, airhandler or outdoor unit). Please program the correct capacity of the (furnace, airhandler or outdoor unit). | [Indicated unit] is missing the programmed unit capacity. Go to [Indicated unit] and pro gram the unit capacity manually. See the unit IOM for programming instructions. Remove power to thermostat before programming the unit control board. Once programming is complete, reconnect thermostat wires and reconfigure system. |
36 |
Critical | (Thermostat) The system has been heating for at least 15 minutes, without a demand for heating. | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for other alarms/codes that may be preventing the system from operating as ex pected. Step 1: Check all heating equipment to determine cause of heating demand. Step 2: Recycle power. System will clear code when it detects condition has cleared. |
37 |
Critical | (Thermostat) The system has been cooling for at least 15 minutes, without a demand for cooling. | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for other alarms/codes that may be preventing the system from operating as ex pected. Step 1: Check all cooling equipment to determine cause of cooling demand. Step 2: Recycle power. System will clear code when it detects condition has cleared. |
38 |
Critical | (Thermostat) The system has not been able to turn on the heating for more than 45 minutes. The system will go offline for 60 minutes and try again. | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for other alarms/codes that may be preventing the system from operating as ex pected. Step 1: Check all heating equipment to determine cause. Step 2: Recycle power. System will clear code when it detects condition has cleared. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
39 |
Critical | (Thermostat) The system has not been able to turn on the cooling for more than 45 minutes. The system will go offline for 60 minutes and try again. | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for other alarms/codes that may be preventing the system from operating as ex pected. Step 1: Check all cooling equipment to determine cause. Step 2: Recycle power. System will clear code when it detects condition has cleared. |
105 |
Critical | (Thermostat / Furnace / Air Handler / Out door Unit/ Equipment Interface Module / Damper Control Module) The (Thermostat, furnace, airhandler or outdoor unit) has lost communication with the rest of the system. | Equipment is unable to communicate. This may indicate the existence of other alarms/ codes. In most cases errors are related to electrical noise. Make sure high voltage power is separated from RSBus. Check for incorrectly wired and/or loose connections between the Thermostat, indoor unit and outdoor unit. Check for a high voltage source of noise close to the system. Generally, this is a selfrecoverable error. |
110 | Critical | (Furnace) The line voltage is too low. | This alarm/code may appear during a brownout. Line voltage is below its designed operat ing value. Check and correct the power line voltage. |
111 | Critical | (Furnace) The line power voltage wiring is reversed. | The unit is reporting that its power line and neutral are reversed. Turn off the power to the system and correct the line power voltage wiring. System resumes normal operation 5 seconds after fault recovered. |
112 | Critical | (Furnace) The reporting device cannot find earth ground. The thermostat will shut down the system. | Provide proper earth ground to the equipment. System resumes normal operation 5 seconds after fault recovered. |
113 | Critical | (Furnace) The line voltage is too high. | Line voltage high (voltage higher than nameplate rating). Provide power voltage within proper range. System resumes normal operation 5 seconds after fault recovered. |
114 | Critical | (Furnace / Air Handler/ / Equipment Interface Module / Damper Control Module)) There is a frequency/distortion problem with the power to the (furnace or airhandler). | This alarm/code may indicate transformer overloading. Check the voltage and line power frequency. Check the generator operating frequency, if the system is running on backup power. Correct voltage and frequency problems. System resumes normal operation 5 seconds after fault recovered. |
115 | Critical | (Furnace / Air Handler) The 24VAC to the (furnace or airhandler control board) is lower than the required range of 18 to 30VAC. | 24Volt Power Low (Range is 18 to 30 volts). Check and correct voltage. Check for addi tional powerrobbing equipment connected to system. This alarm/code may require the installation of an additional or larger VA transformer. |
115 | Critical | (Damper Control Module) The secondary 24VAC damper control module is low. | 24Volt Power Low (Range is 18 to 30 volts). Check and correct voltage. Check for addi tional powerrobbing equipment connected to system. This alarm/code may require the installation of an additional or larger VA transformer. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
117 | Minor | (Furnace) The reporting unit has poor earth grounding. | Provide proper grounding for the unit. Check for proper earth ground to the system. The alarm/code will clear 30 seconds after it is corrected. |
120 |
Moderate | (Thermostat / Furnace / Air Handler / Out door Unit / Equipment Interface Module) There is a delay in the (Thermostat, furnace, airhandler or outdoor unit) responding to the system. | Typically, this alarm/code does not cause any issues and will clear on its own. The alarm/ code is usually caused by a delay in the outdoor unit responding to the thermostat. Check all wiring connections. Cleared after unresponsive device responds to any inquiry. |
124 |
Critical | (Thermostat / Furnace / Air Handler / Out door Unit / Equipment Interface Module / Damper Control Module)) The thermostat has lost communication with the (furnace, airhandler or outdoor unit) for more than 3 minutes. | Equipment lost communication with the thermostat. Check the wiring connections, ohm wires and cycle power. The alarm stops all associated HVAC operations and waits for a heartbeat message from the unit that’s not communicating. The alarm/fault clears after communication is reestablished. |
125 |
Critical | (Thermostat / Furnace / Outdoor Unit / Damper Control Module) There is a hard ware problem on either the (Thermostat, fur nace control board, airhandler control board or outdoor unit control board). | There is a control hardware problem. Replace the control if the problem prevents opera tion and is persistent. The alarm/fault is cleared 300 seconds after the fault recovers. |
126 | Critical | (Furnace / Outdoor Unit) There is an internal communication problem with the (furnace control board, airhandler control board or outdoor unit control board). | There is an internal hardware problem on the control. Typically the control will reset itself. Replace the control if the problem prevents operation and is persistent. The alarm/fault is cleared 300 seconds after the fault recovers. |
130 | Moderate | (Air Handler / Equipment Interface Module) An airhandler configuration jumper is miss ing. | Configuration jumper(s) missing on control (applicable in noncommunicating applications only). Replace the jumper or put wire between terminals on control. Cleared after jumper is connected. |
131 |
Critical | (Thermostat / Furnace / Air Handler / Out door Unit / Equipment Interface Module / Damper Control Module)) The (Thermostat, furnace, airhandler or outdoor unit) control parameters are corrupted. |
Reconfigure the system. Replace the control if heating or cooling is not available. |
132 | Critical | (Air Handler / Damper Control Module) The device’s control software is corrupted. | Recycle power. If failure reoccurs, replace the control. System reset is required to recov er. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
180 |
Critical | (Furnace / Air Handler / Outdoor Unit/ Equip ment Interface Module) The thermostat has found a problem with the (furnace, airhand ler or outdoor unit) outdoor sensor. | In normal operation after control recognizes sensors, the alarm will be sent if valid temper ature reading is lost. Compare outdoor sensor resistance to temperature/resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or airhandler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as ‘installed’ and shown in the ‘About’ screen. The alarm/fault will clear upon configuration, or sensing normal values. |
200 | Critical | (Furnace) The furnace roll out limit switch is open. | Correct the cause of roll out trip. Reset roll out switch. Reset power to clear. Test the fur nace operation. The alarm/fault clears after the furnace roll out switch is closed. |
201 | Critical | (Furnace / Air Handler) The system has lost communication with the (furnace or airhand ler) indoor blower motor. | Lost communication with indoor blower motor. Possible causes include: power outage, brownout, motor not powered, loose wiring, condensation on air handler control without cover on breaker. Problem may be on control or motor side. Cleared after communication is restored. |
202 | Critical | (Furnace / Air Handler) The unit size code for the (furnace or airhandler) and the size of blower motor do not match. | Incorrect appliance unit size code selected. Check for proper configuring under Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. The alarm/fault clears after the correct match is detected following a reset. Remove the ther mostat from the system while applying power and reprogramming. |
203 | Critical | (Furnace / Air Handler) The unit size code for the (furnace or airhandler) has not been selected. | No appliance unit size code selected. Check for proper configuring under: Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. Critical Alert. The alarm/fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming. |
204 | Critical | (Furnace) There is a problem with the fur nace gas valve. | Check gas valve operation and wiring. The alarm/fault clears after the issue is corrected. |
205 | Critical | (Furnace) The furnace gas valve relay con tact is closed. | Check wiring on control and gas valve. The alarm/fault clears after the issue is corrected. |
206 | Critical | (Furnace) The furnace gas valve 2nd stage relay is faulty. | Furnace will operate on 1st stage for the remainder of the heating demand. The alarm/fault will clear after the issue is corrected. If unable to operate 2nd stage, replace control. |
207 | Critical | (Furnace) The furnace hot surface igniter is open. | Measure the resistance of hot surface igniter. Replace the it if it is not within the specified range found in IOM. The alarm/fault clears after the issue is corrected. |
223 | Critical | (Furnace) The furnace low pressure switch is open. | Check pressure (inches w.c.) of low-pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
224 | Critical | (Furnace) The furnace low pressure switch is stuck closed. | Check operation of low pressure switch to see if it is stuck closed for longer than 150 seconds during a heat call . Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
225 | Critical | (Furnace) The furnace high pressure switch is failing to close. | Check pressure (inches w.c.) of high pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
226 | Critical | (Furnace) The furnace high pressure switch is stuck closed. | Check operation of high pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
227 | Moderate | (Furnace) The furnace low pressure switch is open in run mode. | Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
228 | Moderate | (Furnace) The furnace control is not able to calibrate the pressure switch. | Unable to perform pressure switch calibration. Check vent system and pressure switch wiring connections. Check the drain trap for blockage. The alarm/fault clears after a successful calibration. |
229 | Minor | (Furnace) The furnace control has switched to high fire ignition because the low fire pres sure switch did not close in the allowed time. | IFC switched to high fire ignition because low fire pressure switch did not close in allowed time. No action is needed. |
240 | Moderate | (Furnace) The furnace flame current is low. | Check microamperes of the flame sensor using thermostat diagnostics. Clean or replace the flame sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm clears after a proper microamp reading has been sensed. |
241 | Critical | (Furnace) The furnace flame is going out while the furnace is heating. | Shut off gas. Check for a gas valve leak. Replace the gas valve if needed. The alarm/fault will clear when a heat call ends successfully. |
250 | Moderate | (Furnace) The furnace primary limit switch is open. | Check for proper firing rate on furnace. Ensure there is no blockage in the furnace and the duct work. Check for proper air flow. If limit switch is not closed within 3 minutes, the unit will go into 1hour Watchguard mode. The alarm/fault will clear when a heat call ends successfully. |
252 | Moderate | (Furnace) The furnace discharge airtemper ature is high. | Check temperature rise, air flow and input rate. Check for dirty filters. The alarm/fault will clear when a heat call ends successfully. |
270 | Critical | (Furnace) The furnace is in Watchguard mode. The furnace igniter cannot turn on the flame. | This is a five strike condition during a single demand. Check for proper gas flow. Ensure that igniter is lighting burner. Check flame sensor current. Check for dirty filters. The alarm/ fault will clear on successful ignition. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
271 | Critical | (Furnace) The furnace is in Watchguard mode. The furnace low pressure switch is open. | This is a five strike condition during a single demand. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/ fault will clear on successful ignition. |
272 | Critical | (Furnace) The furnace is in Watchguard mode. The furnace low pressure switch is open during run mode. | Check operation of low pressure switch to see if it is stuck open during a heat call. Meas ure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault will clear when a heat call ends successfully. |
273 | Critical | (Furnace) The furnace is in Watchguard mode. The furnace flame is going off during a heating cycle. | Check microamperes of flame sensor using thermostat diagnostics. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm/fault will clear when a heat call ends successfully. |
274 | Critical | (Furnace) The furnace limit switch has been open for more than 3 minutes. | The system will go into Watchguard mode. Check firing rate and air flow. Check for block age. The alarm/fault will clear when a heat call ends successfully. |
275 | Critical | (Furnace) The furnace flame is out of se quence. | The system will go into Watchguard mode. Shut off gas. Check for gas valve leak. The alarm/fault will clear on next successful ignition. |
276 | Critical | (Furnace) The furnace is not able to calib rate or the high pressure switch opened or failed to close in run mode. | The system will go into Watchguard mode. Check vent system and pressure switch wiring connections. The fault/alarm will clear when the furnace calibrates itself successfully. |
290 | Critical | (Furnace) There is a problem with the fur nace ignition circuit. | The system will go into Watchguard mode. Measure resistance of hot surface igniter. Replace the hot surface ignitor it is not within specifications. The alarm/fault will clear on next successful ignition. |
291 | Critical | (Furnace) The heating airflow is below the minimum required level. | The system will go into Watchguard mode. Check for dirty filters and other air flow restric tions. Check blower performance. The alarm/fault will clear when a heat call ends suc cessfully. |
292 | Critical | (Furnace / Air Handler) The (furnace or airhandler) indoor blower motor will not start. | The system will go into Watchguard mode. Indoor blower motor unable to start. This could be due to seized bearing, stuck wheel, obstruction etc. Replace motor or wheel if as sembly does not operate or meet performance standards. The alarm/fault clears after the indoor blower motor starts successfully. |
294 | Critical | (Furnace) There is over current in the fur nace inducer motor. | The system will go into Watchguard mode. Check combustion blower bearings, wiring and amps. Replace if does not operate or does not meet performance standards. The alarm/ fault clears after inducer current is sensed to be inrange after the ignition following the Watchguard mode or reset. |
295 | Minor | (Furnace) The indoor blower motor is over heating. | Indoor blower motor over temperature (motor tripped on internal protector). Check motor bearings and amps. Replace if necessary. The alarm/fault clears after blower demand is satisfied. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
310 | Critical | (Furnace / Air Handler / Damper Control Module) There is a problem with (furnace or airhandler) discharge air sensor. | Compare outdoor sensor resistance to temperature/resistance charts in installation in structions. Replace sensor if necessary. The alarm/fault is cleared 30 seconds after fault is detected as recovered. |
311 | Minor | (Furnace) The heat firing rate has been re duced to match available airflow (cutback mode). | Warning Only. Furnace blower in cutback mode due to restricted airflow. Reduce firing rate every 60 seconds to match available CFM. Check filter and duct system. To clear, replace filter if needed or repair/add duct. 2stage controls will reduce firing rate to 1st stage. The alarm/fault clears when a heat call finishes successfully. |
312 |
Minor | (Furnace / Air Handler) The blower cannot provide the requested CFM due to high stat ic. | Warning Only. Restricted airflow Indoor blower is running at a reduced CFM (Cutback Mode The variable speed motor has preset speed and torque limiters to protect the motor from damage caused by operating outside of design parameters (0 to 0.8” e.g.. total external static pressure). Check filter and duct system. To clear, replace filter if needed or repair/add duct. The alarm/fault is cleared after the current service demand is satisfied. |
313 | Minor | (Furnace / Air Handler) The indoor and out door unit capacities do not match. | Check for proper configuring in installation instructions. Alarm is just a warning. The sys tem will operate, but might not meet efficiency and capacity parameters. The alarm will clear after commissioning is complete. |
344 | Critical | (Furnace) Relay Y1 Failure | Y1 relay failed; operation stopped. Alarm clears 300 seconds after Y1 input sensed OFF. |
345 | Critical | (Air Handler / Equipment Interface Module / Heat Pump) The “O” relay on the airhandler has failed. Either the pilot relay contacts did not close or the relay coil did not energize. | O relay / Stage 1 failed. Pilot relay contacts did not close or the relay coil did not energize. Replace control. Cleared after the fault recovered following reset. |
346 | Critical | (Air Handler) The heat pump jumper was not removed on the airhandler control board. | Configuration link(s) not removed on control. Cut OR. Applicable with non communicating outdoor unit with communicating indoor system. |
347 |
Critical | (Furnace / Air Handler / Equipment Interface Module) The “Y1” relay on the (furnace or airhandler) has failed. Either the pilot relay contacts did not close or the relay coil did not energize. | Operation stopped. Y1 relay / Stage 1 failed. (Pilot relay contacts did not close or the relay coil did not energize; no input back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed. |
348 | Critical | (Furnace / Air Handler) The “Y2” relay on the (furnace or airhandler) has failed. Either the pilot relay contacts did not close or the relay coil did not energize. | Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil did not ener gize; no input back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed. |
349 | Critical | (Furnace) The “O” to “R” jumper on the fur nace needs to be restored. | Configuration link R to O needs to be restored. Replace link or hardwire. Applicable in non communicating mode. Critical Alert. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
350 | Critical | (Air Handler) The airhandler’s electric heat is not configured. | Heat call with no configured or incorrectly configured electric heat. Check for proper con figuring under Configuring Electric Heat Stages in the air handler installation instructions. Cleared after electrical heat detection is successful. |
351 |
Critical | (Air Handler) There is a problem with the airhandler’s 1st stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. | Heat section / Stage 1 failed. (Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize.) Air handler will operate on 1st stage for reminder of the heat call. Will clear after fault recovered. |
352 |
Critical | (Air Handler) There is a problem with the airhandler’s 2nd stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The airhandler will operate on 1st stage electric heat until the issue is resolved. |
Heat section / Stage 2 failed (Same as Code 351). |
353 |
Critical | (Air Handler) There is a problem with the airhandler’s 3rd stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The airhandler will operate on 1st stage electric heat until the issue is re solved.` |
Heat section / Stage 3 failed (Same as Code 351). |
354 |
Critical | (Air Handler) There is a problem with the airhandler’s 4th stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The airhandler will operate on 1st stage electric heat until the issue is resolved. |
Heat section / Stage 4 failed (Same as Code 351). |
355 |
Critical | (Air Handler) There is a problem with the airhandler’s 5th stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The airhandler will operate on 1st stage electric heat until the issue is resolved. |
Heat section / Stage 5 failed (Same as Code 351). |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
370 | Critical | (Furnace) The furnace control board has not received 24VAC power for 2 minutes or more. | Control sees the loss of 24VAC for 2 minutes .Terminate all services and wait for interlock switch to close. The alarm will clear when 24VAC is continuously sensed on DS terminal for a minimum of 10 seconds or on a power reset. If 2 stage with float switch, the IFC control RDS is open. |
380 | Moderate / Critical | (Equipment Interface Module) Interlock relay failure (IFC or AHC mode only) | Interlock relay is energized, but input is not sensed after 3 seconds. There will be no heat ing or cooling due to this error. Deenergize interlock relay and energize after 5 minutes if demand is still present. |
381 | Moderate / Critical | (Equipment Interface Module) Interlock relay stuck (IFC or AHC modes only) | Interlock relay continuously sensed (with relay off). No heating and cooling operations. Alarm clears 30 seconds after fault clears. |
382 | Moderate | (Equipment Interface Module) Relay W1 fail ure (IFC and AHC modes only) | W1 relay energized, but input is not sensed after three seconds. |
400 | Critical | (Outdoor Unit) The compressor internal overload has tripped. | Thermostat demand Y1 is present; but, compressor is not running. Check power to unit. Clears the error after current is sensed in both RUN and START sensors for at least 2 seconds, or after service is removed, or after power reset. |
401 |
Moderate | (Outdoor Unit) Either the compressor ran for more than 18 hours continuously trying to cool the home or the refrigerant pressure in the system is low. | Compressor ran more than 18 hours to satisfy a single thermostat demand. Will not lock out system. If 2 stage, units with blinking LED light controls, unit will run in low speed; units with 7segment display will display code, but continue to run in high speed. If a Heat Pump, and if outdoor temp is less than 65 degrees, code is ignored. Clears the error after 30 consecutive normal run cycles or power reset. Also monitors low pressure switch trips. |
402 | Critical | (Outdoor Unit) Either the discharge or suc tion pressure level is outoflimits, or the is compressor overloaded. | Discharge or suction pressure outoflimits, or compressor overloaded. Clears the error after 4 consecutive normal compressor run cycles. |
403 | Moderate | (Outdoor Unit) The compressor ran for less than 3 minutes to satisfy a thermostat de mand. | Compressor runs less than 3 minutes to satisfy a thermostat demand. Clears the error after 4 consecutive normal run cycles or power reset. |
404 | Critical | (Outdoor Unit) The compressor rotor is locked up. This could be due to a short cir cuiting of the run capacitor, seizing of the bearings or excessive liquid refrigerant etc. | Compressor rotor locked up due to run capacitor short, bearings are seized, excessive liquid refrigerant, etc. (NOTE: May need to install hard start kit). Clears the error after 4 consecutive normal run cycles or after power reset. |
405 | Critical | (Outdoor Unit) The compressor circuit is open. This could be due to a power discon nection, open fuse etc. | Compressor circuit open (due to power disconnection, open fuse, etc.) Clears the error after 1 normal compressor run cycle. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
406 | Critical | (Outdoor Unit) The required amount of cur rent is not passing through the start current transformer. | Required amount of current is not passing through Start current transformer. Clears the error after current is sensed in START sensor, or after power reset. |
407 | Critical | (Outdoor Unit) The required amount of cur rent is not passing through run current trans former. | Required amount of current is not passing through the RUN current transformer. Clears the error after current is sensed in the RUN sensor, or 1 normal compressor run cycle, or after power reset |
408 | Critical | (Outdoor Unit) The compressor is running continuously. | Compressor runs continuously. Clears the error after 1 normal compressor run cycle or after power reset. |
409 |
Moderate | (Furnace / Air Handler / Outdoor Unit) The secondary voltage for the (furnace, airhand ler or outdoor unit) has fallen below 18VAC. If this continues for 10 minutes, the thermo stat will turn off the (furnace, airhandler or outdoor unit). |
Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued. Clears the code after voltage is higher than 20VAC for two seconds or after power reset. |
410 | Moderate | (Outdoor Unit) The outdoor unit pressure is below the required limit. | Low pressure switch opens at at a specific pressure (system shuts down) and closes at a specific pressure (system restarts). For specific unit low pressure values, see the applicable unit documentation. |
411 | Critical | (Outdoor Unit) The low pressure switch has opened 5 times during a single demand. As a result, the thermostat has shutdown the outdoor unit. | Open low pressure switch error count reached five strikes. Check system charge using approach and sub cooling temperatures. Reset by putting outdoor unit control in test mode or resetting low voltage power. |
412 | Moderate | (Outdoor Unit) The outdoor unit pressure is above the required limit. The system will shut down. | Unit pressure is above the upper limit. System is shut down. Confirm that the system is properly charged with refrigerant. Check condenser fan motor, TXV, indoor unit blower motor, stuck reversing valve or clogged refrigerant filter. Confirm that the outdoor unit is clean. The alarm clears after the pressure switch closes or a power reset |
413 | Critical | (Outdoor Unit) The high pressure switch has opened 5 times during a single demand. As a result, the thermostat has shutdown the outdoor unit. | Open high pressure switch error count reached 5 strikes. Check system charge using approach and sub cooling temperatures. Check outdoor fan operation. Check for dirt or debris blocking air flow to outdoor unit. Reset by putting outdoor unit control in test mode or resetting low voltage power. |
414 | Critical | (Outdoor Unit) The discharge line temperat ure is higher than the recommended upper limit of 279ºF. | Discharge line temperature is > 279ºF. Make sure coil is clean and airflow unobstructed in and out of condenser. Check system operating pressures and compare to unit charging charts in installation manual. Clears after discharge temperature is < 225ºF. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
415 | Critical | (Outdoor Unit) The discharge line temperat ure has been consistently higher than the recommended upper limit of 279ºF. | Discharge line high temperature error count reached five strikes. Make sure coil is clean and airflow unobstructed in and out of condenser. Check system charge using approach and sub cooling temperatures. Reset by putting outdoor board in test mode or resetting low voltage power. |
416 |
Critical | (Outdoor Unit) The outdoor coil sensor is either open, shortcircuited or the temperat ure is out of sensor range. As a result the outdoor unit control will not perform any de frost tempering. | Sensor being detected open or shorted, or temperature is out of sensor range. Outdoor unit control will not perform demand or time/temperature defrost operation. (Sys tem will still heat or cool.) Clears when outdoor unit control detects proper sensor read ings. |
417 |
Critical | (Outdoor Unit) The outdoor unit sensor is either open, shortcircuited or the temperat ure is out of sensor range. As a result the outdoor unit control will not perform any de frost tempering. | Outdoor unit control detects open or shorted sensor, or temperature that is out of sensor range. Critical Alert after 10 minutes. Reset by replacing sensor. This fault is detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance is not within range after 90 seconds, the board will count one fault. After 5 faults, the board will lock out. Check for proper sensor reading and attachment to line. Replace if outofspecifications. |
417 |
Moderate / Critical | (Damper Control Module) The damper con trol discharge air temperature sensor is either open, shortcircuited or the temperat ure is out of sensor range. As a result the outdoor unit control will not perform any de frost tempering. | The damper control module detects open or shorted discharge sensor, or temperature that is out of discharge sensor range. Check the resistance of the discharge sensor and com pare to temperature resistance chart replace if needed. Reset by replacing the discharge sensor. This fault is detected by allowing the unit to run for 90 seconds before checking discharge sensor resistance. If the discharge sensor resistance is not within range after 90 seconds, the control will count one fault. After 5 faults, the control will lock out. Check for proper sensor reading and attachment to line. The alarm clears after a power reset. |
418 |
Moderate | (Outdoor Unit) There is a faulty “W” output circuit. | W terminal is energized while in cooling mode. Possible cause may be a stuck closed relay on the control, or something external to the control that is energizing W terminal when it should not be energized. Solution: Disconnect any wiring from the W terminal. If 24 volts is still on the terminal, then it is a stuck relay. If the 24 volts disappears, then there is a need to check any of the wires hooked up to the W terminal. |
419 | Critical | (Outdoor Unit) The “W” output on the out door unit has reported more than 5 errors. As a result, the system has shutdown the outdoor unit. | The W output (code E418) on the outdoor unit has reported more than five strikes. As a result, the system has shutdown the outdoor unit. Disconnect thermostat lines from W and verify 24VAC on the W. If 24VAC is present, replace the control. |
420 | Critical | (Outdoor Unit) The “W” output terminal on the outdoor unit is not wired correctly | Defrost cycle lasts longer than 20 minutes. Check heat pump operation. Cleared when W1 signal is removed. Applicable only in communicating mode with noncommunicating heat pump. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
421 | Critical | Air Handler / Equipment Interface Module). The heat pump defrost cycle has taken more than 20 minutes to complete. | Voltage sensed on W output terminal when Y1 out is deactivated. |
422 | Moderate | Compressor top cap switch exceeding thermal limit. | Check condenser fan motor, TXV, indoor unit blower motor, stuck reversing valve or clogged refrigerant filter. Automatically clears when error is corrected. |
423 | Moderate / Critical | The inverter has detected a circuit problem. | Control will lockout after 10 strikes within an hour. To clear disconnect power to outdoor unit and restart. |
424 |
Moderate |
The liquid line temperature sensor has mal functioned. | In normal operation after outdoor control recognizes sensors, the alarm will be sent if valid temperature reading is lost. Compare liquid line sensor resistance to temperature/resist ance charts in unit installation instructions. Replace sensor pack if necessary. At the be ginning of (any) configuration, furnace or airhandler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as ‘installed’ and shown in the iComfort WiFi® thermostat ‘About’ screen. The alarm / fault will clear upon configuration, or sensing normal values. |
425 | Minor | Outdoor control has increased minimum compressor speed to allow for proper oil re turn due to low ambient temperature. | Outdoor ambient temperature is below system limit. Control will attempt to run at lowest allowed compressor speed to allow for proper oil return. Automatically clears when out door ambient temperature rises above limit for more then 5 minutes. |
426 | Critical | Excessive inverter alarms | After ten faults within one hour control will lockout. To clear disconnect power to outdoor unit and restart. Inverter alarms 12 to 14 and 53 do not count towards this lockout condi tion. |
427 | Moderate / Critical | The inverter has detected a DC peak fault condition. | If condition (55A or higher) is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If peak current (55A or higher) occurs 10 times within an hour, system will lockout. To clear, disconnect power to outdoor unit and restart. |
428 | Moderate / Critical | The inverter has detected a high main input current condition. | If condition is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 10 times within an hour, system will lockout. To clear, discon nect power to outdoor unit and restart. |
429 | Moderate / Critical | The inverter has detected a DC link low voltage condition. | Error occurs when DC link voltage drops below 14VDC. If condition is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 10 times within an hour, system will lockout. To clear, disconnect power to outdoor unit and restart. |
430 | Moderate / Critical | Compressor startup failure | If condition is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 10 times within an hour, system will lockout. To clear, discon nect power to outdoor unit and restart. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
431 | Moderate / Critical | The inverter has detected a PFC circuit overcurrent condition. | Error occurs when PFC detects a over current condition of 100A peak. If condition is de tected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 10 times within an hour, system will lockout. To clear, disconnect power to outdoor unit and restart. |
432 | Moderate / Critical | The inverter has detected a DC link high voltage condition. | Error occurs when the DC link capacitor voltage is greater than 480VDC. If condition is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condi tion occurs 10 times within an hour, system will lockout. System will stop. To clear, discon nect power to outdoor unit and restart. |
433 | Moderate / Critical |
Compressor phase current is too high. | Error occurs when compressor peak phase current is greater than 28A. Inverter will issue code 14 first and slow down to try to reduce the current. If the current remains high, out door unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 5 times within an hour, system will lockout. To clear disconnect power to outdoor unit and restart. |
434 | Moderate / Critical | Outdoor control has lost communications with the inverter for greater than 3 minutes. | This error will occur when communication checksum error occurs for 3 minutes. Outdoor control will stop all compressor demands, recycle power to the inverter by deenergizing the contactor for 2 minutes. |
435 | Moderate / Critical | Inverter internal error. | When this error occurs, the outdoor control will cycle power to the inverter by opening the contactor for 2 minutes. Outdoor control will cycle power to the inverter 3 times and then outdoor unit is locked out. |
436 | Moderate / Critical | Inverter heat sink temperature exceeded limit. | This occurs when the heat sink temperature exceeds the inverter limit. Inverter will issue code 13 first and slow down to try to cool the heat since. If temperature remains high, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 5 times within an hour, system will lockout. System will stop. To clear, disconnect power to outdoor unit and restart. |
437 | Moderate / Critical | Heat sink temperature sensor fault has oc curred (temperature less than 4 ºF or great er than 264ºF after 10 minutes of operation). | This occurs when the temperature sensor detects a temperature less than 0.4ºF or great er than 264ºF after 10 minutes of operation. If condition is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condition occurs 5 times within an hour, system will lockout. To clear disconnect power to outdoor unit and restart. |
438 | Moderate / Critical | The inverter has detected a PFC circuit overcurrent condition. | Error occurs when PFC detects an input over current condition of 35A peak. If condition is detected, outdoor unit will stop (compressor and fan). Antishort cycle is initiated. If condi tion occurs 10 times within an hour, system will lockout. To clear, disconnect power to outdoor unit and restart. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
439 | Moderate | Compressor slowdown due to high input cur rent. | Input current is approaching a high limit. Compressor speed will automatically slow down. The control continues sending the inverter speed demanded by the thermostat. The con trol will set indoor CFM and outdoor RPM to values according to demand percentage rather than the actual Hz. Alarm is automatically clear. |
440 | Moderate | Compressor slowdown due to high heatsink temperature. | Heat sink temperature is approaching limit. The compressor speed will automatically slow down to reduce heatsink temperature. The control will set indoor CFM and outdoor RPM to values according to demand percentage rather than the actual Hz. Alarm is automatic ally cleared. |
441 | Moderate | Compressor slowdown due to high com pressor current. | Compressor current is approaching high limit. The compressor speed will automatically slow down. The control will set indoor CFM and outdoor RPM to values according to de mand percentage rather than the actual Hz. Alarm is automatically cleared. |
442 | Critical | The top cap switch has opened 5 times with in one hour. As a result, the outdoor unit is locked out. | When compressor thermal protection sensor opens 5 times within 1 hour. Outdoor unit will stop. To clear, disconnect power to outdoor unit and restart. |
443 | Critical | Incorrect appliance unit size code selected. | Check for proper configuring under unit size codes for outdoor unit on configuration guide or in installation instructions. If replacing inverter, verify inverter model matches unit size. The alarm/fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming. |
530 | Moderate / Critical | Low Damper 24VAC Voltage | • Damper Supply voltage is < 18VAC. • Maintain nonzone mode for 5 minutes after alarm clears. |
532 | Moderate | Zoning Pressure Switch Opened (high pres sure) | Compressor pressure is above the specified limit. Compressor is turned off. Zoning will be restored once the high pressure switch closes. |
542 | Moderate / Critical | Zone 1 Temperature Sensor Problem | Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds after fault is recovered. |
543 | Moderate / Critical | Zone 2 Temperature Sensor Problem | Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds after fault is recovered. |
544 | Moderate / Critical | Zone 3 Temperature Sensor Problem | Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds after fault is recovered. |
545 | Moderate / Critical | Zone 4 Temperature Sensor Problem | Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds after fault is recovered. |
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in Table 1. Alert Codes and Troubleshooting the Installer alert button. Minor and Moderate alerts are found only in the Installer alert button. | |||
Alert Code | Priority | Alert Text | Steps to clear |
594 | Moderate / Critical | (Equipment Interface Module) Precoil dis charge air temperature sensor problem (DFM mode only). Advances from moderate to critical after ten (10) minutes. | Interlock relay energized, but input not sensed after 3 seconds. No heating and cooling operations. Deenergize interlock relay and reenergized 5 minutes later if demand is still present. Alarm clears 5 minutes after fault clears. |
600 | Critical | Compressor has been cycled OFF on utility load shedding. | Load shedding function: Provides a method for a local utility company to limit the maximum power level usage of the outdoor unit. The feature is activated by applying 24 volts AC power to the L and C terminals on the outdoor control. |
601 |
Critical | Outdoor unit has been cycled OFF on low temperature protection. | Low temperature Protection: Outdoor unit will not operate when the outdoor temperature is at or below 4°F (15.6°C). If the unit is operating and the outdoor temperature drops be low 4°F (15.6°C), the unit will continue to operate until the room thermostat is satisfied or the outdoor temperature drops to 15°F (9.4°C). (Outdoor unit ambient sensor provides temperature readings). |
700 | Moderate | (Thermostat) The temperature sensor in the thermostat is not working properly. | Recalibrate thermostat to clear. Replace thermostat if needed. |
701 | Moderate | (Thermostat) The thermostat is reading in door temperatures above the prepro grammed limit. | Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace thermostat, if needed. |
702 | Moderate | (Thermostat) The thermostat is reading in door temperatures below the prepro grammed limit. | Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace thermostat, if needed. |
703 | Moderate | (Thermostat) The humidity sensor in the thermostat is not working properly. | Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed. |
704 | Moderate | (Thermostat) The thermostat is reading in door humidity levels above the prepro grammed limit. | Recalibrate thermostat to clear. Replace thermostat, if needed. |
705 | Moderate | (Thermostat) The thermostat is reading in door humidity levels below the prepro grammed limit. | Recalibrate thermostat to clear. Replace thermostat, if needed. |
Ohm Check | — | The ohm reading in the system is either too high or too low. | Ohm reading between i+ and i anywhere on the RSBus with supply power off should be between 70 and 90 ohms. If above 90 ohms, check and repair wiring, splices or other wiring defects that may be causing the excessive resistance. If less than 70 ohms, check for shorted wires. |
HOMEOWNER SERVICE ALERT CODES
Number | Value | Number | Value | Number | Value | Number | Value | Number | Value |
3000 | Filter 1 | 3002 | Humidifier Pad | 3004 | Maintenance | 4000 | User Wi-Fi state change, dis able | 4002 | Image file download failed |
3001 | Filter 2 | 3003 | UV Light | 3005 | PureAir Maintenance | 4001 | Firmware download failed |
DAS NOTE − The discharge air sensor is intended to be mounted downstream of the heat exchanger and air conditioning coil. It must be placed in free airflow, where other accessories (such as humidifiers, UV lights, etc.) will not interfere with its accuracy. Wiring distance between the IFC or AHC and the discharge air sensor should not exceed 10ft when wired with 18−gauge thermostat wire.
OAS NOTE − Wiring distance between the IFC or AHC and the outdoor temperature sensor should not exceed 200ft when wired with 18−gauge thermostat wire.
DAS NOTE − The discharge air sensor is intended to be mounted downstream of the heat exchanger and air conditioning coil. It must be placed in free airflow, where other accessories (such as humidifiers, UV lights, etc.) will not interfere with its accuracy. Wiring distance between the IFC or AHC and the discharge air sensor should not exceed 10ft when wired with 18−gauge thermostat wire.
OAS NOTE − Wiring distance between the IFC or AHC and the outdoor temperature sensor should not exceed 200ft when wired with 18−gauge thermostat wire.
RSBUS NOTE Maximum total length of all connections on the RSBus is limited to 1500 ft. (450 m). Max. length between components is 300 ft. (90 m).
Communicating systems using the iComfort Wi‐Fi® thermostat require four thermostat wires between the thermostat and the furnace/air handler control and four wires between the outdoor unit and the furnace/air handler control. When a thermostat cable with more than four wires is used, the extra wires must be properly connected to avoid electrical noise. The wires must not be left disconnected.
Use wire nuts to bundle the unused wires at each end of the cable. A single wire should then be connected to the indoor unit end of the wire bundle and attached to the “C” terminals as shown in the diagram above. This is not an issue in non-communicating systems.
IMPORTANT: After electric heat strips are installed, the Air Handler Control (AHC) must be manually configured to detect the number of electric heat sections. (SEE ALSO 506181-01 for complete configuration guide.)
This procedure is applicable only to the CBX32MV-XX-230-6-06 and higher and CBX40UHV (all models). To configure the heat strips so that they will be detected by the thermostat:
Access all the great Wi-Fi enabled features on your iComfort® thermostat from our secure web portal.
www.myicomfort.com
After signing in, you’ll be able to view your iComfort system settings, adjust the temperature and view reminders and alerts – just as you would on your iComfort thermostat at home. With a familiar look and settings this simple, you should feel right at home. Don’t forget to check out the available Apps and skins.
From the web portal welcome page, you may also click on links to launch an interactive demo or learn more about iComfort.
You can also customize the screen-saver by uploading your own photo on· www.myicomfort.com under the tab ”skins”. Image must be 800×480 DPI in JPG format.
To access the installer screens after the unit has been placed in operation and the user home screen is displayed, touch the “Lennox” logo and hold for 5 seconds. The system will access the installer screens.
A message screen stating “Qualified Lennox equipment installer warning” screen appears.
After initial installation, if an alert is present when you are making changes to settings, no action on the alert is mandatory. Press equipment if you need to set up equipment parameters and edit details of devices in the system. Press diagnostics if you need to analyze the system (see page 18). If any component of the HVAC system has been changed, e.g. replacing an outdoor sensor, reconfiguring the system will be required. To begin reconfiguring a system (after you have accessed the program from the Lennox logo [previous page]), touch the setup button. The “Start system configuration” screen will appear. Press start to proceed. The “Re-configure confirmation” screen will appear. This reminder notes that system configuration may affect some existing device settings and prompts to confirm or cancel the configuration process. Press confirm to continue system configuration; the screen will change to the system discovery screen. At this point, the program goes through the same setup as the initial setup process which begins on page 3.
NOTE – “Compatible device found” screen (shown below) appears only when a device has been removed and replaced with a compatible device.
Download Manual: Lennox icomfort Wi-Fi Programmable Thermostat installation and setup guide
Lennox icomfort Wi-Fi Programmable Thermostat installation and setup guide
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