The Simple thermostat supports 2 heating stages and 2 cooling stages for conventional systems, and 2 heating/cooling stages for heat pumps, with or without emergency heat.
A common wire (C-wire) or other 24VAC power source is required.*
WARNING: Line voltage and millivolt systems are not supported.
To sign up for an account and begin your installation, visit: home.thesimple.com/instal
To adjust settings remotely, or to create your personalized schedule, visit home.thesimple.com, or install the Simple thermostat mobile app for iOS or Android.
*If you do not have a C-wire, or are not sure, visit www.thesimple.com/compatibility
Connect your system’s wiring using the table below.
| Terminal | Function |
| RC | 24VAC for cooling. |
| RH | 24VAC for heating. If there is only one R wire (R, RH, RC) then connect it to RH. May be labeled V or VR for Lennox. |
| C | Common wire. May be labeled X for Rheem, Ruud, or Lennox; B for Trane, York. |
| Y | 1st stage compressor, A/C or heat pump. May be labeled M for Lennox. |
| Y2 | 2nd stage compressor, A/C or heat pump. |
| W/E | 1st stage heating, or heat pump emergency heat. Some heat pumps may designate emergency heat as E or X2, or auxiliary heat as W1 or W2. May be labeled Y for Lennox. |
| W2 | 2nd stage heating. Not used for heat pumps. |
| O/B | Heat pump changeover valve. |
| Function | ||
| During Thermostat Operation | While in Menu | |
| UP increases the temperature setting. | Previous menu item. | |
| DOWN decreases the temperature setting. | Next menu item. | |
|
| MENU enters and exits the Settings menu. | Return to the previous menu. |
| MODE changes the system mode and cancels HOLD, AWAY, Utility EVENT, or Efficiency adjustments. | Selects the current item or enter the sub-menu. | |
| AWAY enters timed energy-saving settings. Press again to exit. | Return to the previous menu. | |
You can select whether HEAT or COOL is provided using the circular MODE button. The MODE button cycles sequentially through the available modes. Only the modes supported by your system are shown. For example, a furnace-only installation alternate between OFF and HEAT when the MODE button is pressed. A conventional system with both heating and cooling will cycle through OFF, HEAT, COOL, and AUTO each time MODE is pressed.
If your system supports both heating and cooling, AUTO mode is a convenient setting to automatically switch between HEAT and COOL modes.
Thermostat Modes
| Thermostat Modes | |
| OFF | When OFF, the system is turned off. No heating or cooling occurs. |
| HEAT icon indicates system is in heat-only mode, and flashes when the heating system is running. | |
| COOL icon indicates system is in cool-only mode, and flashes when the cooling system is running. | |
| | AUTO mode switches between heat and cool depending on the indoor temperature. A flashing HEAT or COOL icon indicates which mode is running. |
| EMERGENCY HEAT is only applicable for heat pumps. The mode icon flashes when the system is running. | |
To the right of the display, the UP and DOWN buttons adjust your desired temperature. Each button changes the temperature by 1 degree.*
Holding the UP or DOWN button automatically increases or decreases the temperature setting.
Your thermostat has a schedule that changes the temperature according to day and time. When making a temperature adjustment, this setting is maintained until the next scheduled interval.
If you manually adjust the temperature on your thermostat, the display shows HOLD UNTIL and the time of the next interval when the schedule resumes. If the temperature is adjusted to match the schedule, the HOLD UNTIL display is cleared. Your schedule can be enabled or disabled in the menu.** When the schedule is disabled, your temperature adjustments are held indefinitely, and the display shows HOLD.
* When the display is showing Celsius, each adjustment is by 0.5°C.
** If you’ve received your thermostat from a utility or energy company, you may be required to keep the schedule enabled.
Returning to Schedule
When a schedule is running, a manual adjustment can be canceled by pressing the MODE button. This returns you to the temperature setting of your schedule and the HOLD UNTIL indicator is cleared.
You can temporarily choose an energy-saving setting using the AWAY button, located in the lower-right corner of the display. Pressing this button cycles through the following choices:
You may adjust the temperature for the AWAY period using the UP or DOWN buttons while the away duration is flashing.
If no other button is pressed, after 5 seconds the current AWAY setting is applied. Pressing the MODE button when AWAY is flashing accepts the current settings and starts AWAY immediately.
While any AWAY mode is active, manual temperature changes using the UP or DOWN buttons are disabled. You must cancel AWAY before making further adjustments.
The AWAY temperature is held until the AWAY duration expires, and the end time is shown in the status display.
Selecting AWAY ON is a permanent away and the temperature is held until AWAY is canceled. In this case, the UNTIL status is not shown.
When AWAY is in effect, it can be canceled using either the MODE or AWAY buttons. Canceling AWAY returns you to the scheduled temperature setting for the current day and time. If the schedule is not running, canceling AWAY returns to the same temperature setting when AWAY was started.
Energy Management Events
Your account may be configured to participate in Energy Management Events. When an event is in progress, the lower-right display shows PRE EVENT or EVENT and the UNTIL end time for the event. A PRE-EVENT may occur before an EVENT to help reduce your energy consumption during peak hours.
Manual changes to temperature using the UP or DOWN buttons are disabled during a PRE-EVENT or EVENT. The event must be canceled before adjustments can be made.
Canceling an Event
To cancel an EVENT that is in progress, press the MODE button. If the EVENT is canceled during the PRE-EVENT phase, the subsequent EVENT phase will continue to be applied.
Your account can be configured with an energy efficiency program that makes automated adjustments to your temperature settings. When these changes are applied, the leaf indicator is shown along with the current temperature setting. You can continue to make adjustments using the UP or DOWN buttons. However, the Leaf indicator is turned off when you change to a less efficient temperature. The leaf indicator is also turned off when you enter AWAY. For more information, please visit: www.thesimple.com/support/ee
Canceling Energy Efficiency
When your schedule is enabled, pressing the MODE button cancels the current energy efficiency settings and returns to the temperature setting of your schedule.
The MENU button on the lower-left front panel opens the thermostat menu. The message line shows the current menu item, and the UP or DOWN buttons can be used to navigate. The MODE button selects the current menu or sub-menu item displayed.
Pressing MENU again exits the menu. After 20 seconds of inactivity, the menu automatically exits.
| Main Menu | ||
| Menu Item | Choices | Description |
| FAN MODE | AUTO ON | Normally set to AUTO. When set to ON, the fan runs and the fan indicator flashes. |
| SCHEDULE | ON HOLD | Normally set to ON to enable schedule changes. When set to HOLD, temperature adjustments must be changed manually. The HOLD indicator is shown on the display. |
| >SETTINGS | Enter the SETTINGS menu to customize user preferences. | |
| >NETWORK | Enter the NETWORK menu to join a Wi-Fi network and view network settings. | |
| >INSTALL | Enter the INSTALL menu to view install code and register the thermostat. | |
| >INFO | Enter the INFO menu to view thermostat date and time, and firmware versions. | |
| Settings Menu | ||
| Menu Item | Choices | Description |
| BRIGHTNESS | LOW MEDIUM HIGH | Adjust the brightness level of the display. |
| BACKLIGHT | OFF ON | When ON, the display dims after 30 seconds of inactivity. Otherwise the display turns off after 30 seconds. |
| SOUND | OFF LOW MEDIUM HIGH | Adjust the volume level of sounds when buttons are pressed. |
| DEG DISPLAY | FAHRENHEIT CELSIUS | Set the units shown on the display. This does not change the units in the mobile app. |
| CLOCK | 12 HR 24 HR | Set the clock to use a 12-hour time with AM/PM, or a 24-hour time. |
| Network Menu | ||
| Menu Item | Choices | Description |
| WPS NOW | WPS ON | Press MODE to start Wi-Fi Protected Setup. Then press the WPS button on your router to automatically join the Wi-Fi network. |
| WIFI NOW | THERM-nnnn | Press MODE to start the thermostat Wi-Fi Access Point. The network name is THERM-nnnn, where nnnn is a suffix assigned to your thermostat. Connect to THERM-nnnn, then launch a browser and visit: http://192.168.10.1 Follow the instructions to select your Wi-Fi network and enter the network password. |
| SSID | The network name when configured for Wi-Fi. If not configured, then the network name is THERM-nnnn described above. If the network name is more than 11 characters, press MODE to show next portion of the name. | |
| Network Menu | ||
| Menu Item | Choices | Description |
| IP ADDRESS | The IP address of your thermostat. If the address exceeds 11 characters, press MODE again to see more. When not connected, 0.0.0.0 is shown. | |
| MAC | The MAC address of your thermostat as 16 characters (IPv6). Press MODE to show the next portion of the MAC. | |
| SIGNAL | The Wi-Fi signal strength in dB. -60 or more is usually a good connection.
A signal strength of less than -65 may require improving your Wi-Fi network. | |
| Install Menu | ||
| Menu Item | Choices | Description |
| INSTALL NOW | Press MODE to show the 10-character Install Code. This code is required when registering for cloud services. The code is also printed on the back of the unit. | |
| Info Menu | ||
| Menu Item | Choices | Description |
| DATETIME | The date and time of the thermostat. The date appears in the message line, and the time in the status display. This can be used to confirm time zone and DST settings. | |
| FIRMWARE | The thermostat firmware versions. There are 4 firmware versions, and each press of MODE shows the next one. | |
The Advanced Menu is hidden from normal operation. Pressing MENU and MODE simultaneously for 5 seconds enters the advanced menu. After 20 seconds of inactivity, this menu exits automatically.
| Advanced Menu | ||
| Menu Item | Choices | Description |
| LOCK | OFF ALL SETPOINT | Locks the front panel to prevent unauthorized changes. Settings can still be changed with the mobile app.
LOCK ALL prevents all front panel changes, including changing mode.
LOCK SET POINT allows changing mode and using AWAY, but the temperature settings cannot be changed.
The lock indicator is shown when the thermostat is locked. |
| Advanced Menu | ||
| Menu Item | Choices | Description |
| >HVAC INFO | Enters the HVAC menu to configure your system settings. When connected to Wi-Fi, the menu is called HVAC INFO, and the menu is read-only | |
| RESET | CONFIRM | When MODE is pressed, the thermostat restarts. Existing settings are unchanged. |
| HVAC Menu | ||
| Menu Item | Choices | Description |
| HVAC TYPE | HEAT COOL HEAT ONLY COOL ONLY HT PUMP HT PUMP EM | Type of system connected to this thermostat.
This setting is read-only when Wi-Fi is configured. |
| CHANGEOVER | O – COOL ON B – HEAT ON | Applies only to heat pumps.
Determines whether heat or cool is active. If your heat pump is heating when it should be cooling, and vice-versa, please change this setting.
This setting is read-only when Wi-Fi is configured. |
| FURNACE | GAS ELECTRIC | Applies only to forced air systems, including heat pump emergency heat.
This setting is read-only when Wi-Fi is configured. |
| NO NETWORK | The Wi-Fi connection is configured, but no connection exists.
Please confirm that your internet connection is active, and your Wi-Fi password has not changed. In some cases, restarting your router may help. The thermostat reset button may also help to restart the network connection. |
| HP FAULT | A heat pump fault is reported via the L-wire. Contacting an HVAC technician is recommended. |
| UPDATING CHECK IMAGE WRITE IMAGE | The thermostat is being updated with a remote update. Do not remove power or unplug your thermostat. |
The top of the thermostat has a pinhole reset button. This restarts the device but does not clear your existing heating/cooling system configuration or your network connection.
When the thermostat restarts, it will attempt to re-establish the Wi-Fi connection with your router.
If you wish to clear all thermostat configurations, please perform Reset to Factory Settings.
This thermostat is intended to be connected to your Wi-Fi network. However, it is fully functional as a conventional thermostat when disconnected.
If you wish to use the thermostat as a disconnected device, the system heating and cooling configuration must be configured using the Advanced Menu before use.
If this thermostat was previously configured for another Wi-Fi network, you must first clear the old connection with a Factory Reset.
The default configuration for your thermostat is for conventional heating and cooling. If you have a heat pump or other configuration, do not use the MODE button until the thermostat has been configured.
| HVAC TYPE | HEAT COOL HEAT ONLY COOL ONLY HT PUMP HT PUMP EMR | Type of system connected to this thermostat.
When connected to Wi-Fi, these settings are configured via the app. |
| CHANGEOVER | O – COOL ON B – HEAT ON | Applies only to heat pumps. Determines whether heat or cool is active. Most heat pumps are O, but Rheem/Ruud typically use B.
If your heat pump is heating when it should be cooling, and vice-versa, please change this setting. |
| FURNACE | GAS ELECTRIC | Applies only to forced air systems, including heat pump emergency heat. |
| HOUR | nn | Set the hour of the time. If the 12-hour clock, then the choices are 1-12. |
| MINUTE | nn | Set the minute of the time, 00-59. |
| AM/PM | AM PM | This choice is only shown for a 12-hour clock. |
| MONTH | JAN JUL FEB AUG MAR SEP APR OCT MAY NOV JUN DEC | Set the current month. |
| DAY | nn | Set day, with a range of 1 to the last day of the current month. |
| YEAR | nnnn | Set the year, with range of 2016 to 2100. |
The thermostat has a built-in schedule that is used when disconnected. You can use the menu to turn off the schedule, or you can connect your thermostat to Wi-Fi and personalize your schedule.
| Weekday (Mon-Fri) | ||
| Interval | Heat Setpoint | Cool Setpoint |
| 6 AM | 71 F, 21.7 C | 77 F, 25.0 C |
| 8 AM | 68 F, 20.0 C | 79 F, 26.2 C |
| 6 PM | 70 F, 21.1 C | 75 F, 23.9 C |
| 10 PM | 67 F, 19.5 C | 76 F, 24.5 C |
| Weekend (Sat-Sun) | ||
| Interval | Heat Setpoint | Cool Setpoint |
| 7 AM | 71 F, 21.7 C | 77 F, 25.0 C |
| 10 AM | 68 F, 20.0 C | 79 F, 26.2 C |
| 6 PM | 70 F, 21.1 C | 75 F, 23.9 C |
| 11 PM | 67 F, 19.5 C | 76 F, 24.5 C |
WARNING: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
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