This thermostat is compatible with the following systems:
Do you need assistance? We are here to help.
Call 1-800-468-1502 for wiring assistance before returning the thermostat to the store.
This thermostat cannot be used on heat pumps with backup heat or on multistage systems.
This product does not contain mercury. However, this product may replace a product that contains mercury. Mercury and products containing mercury should not be discarded in household trash.
For more information on how and where to properly recycle a thermostat containing mercury in the United States, please refer to the Thermostat Recycling Corporation at www.thermostat-recycle.org.
For mercury thermostat recycling in Canada, please refer to Switch the Stat at www.switchthestat.ca
NO MERCURY
For assistance with this product, please visit http://yourhome.honeywell.com. Or call Honeywell Customer Care toll-free at 1-800-468-1502. To save time, please note your model number and date code before calling- Pull at the bottom to remove the thermostat from the wallplate
Turn the thermostat over to find the model number and date code.
Alternate Wiring
jumper.
Move the switch to the proper setting:
Gas or Oil: For gas or oil heating systems, leave the fan operation switch in this factory-set position (for systems that control the fan in a call for heat).
Electric or Heat Pump: Change the switch to this setting for heat pump or electric heat systems. (This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.)
Install Thermostat onto Wallplate
Install thermostat onto the wallplate on the wall.
Turn Power Back On
Circuit breaker box
Heating/cooling system power switch
If your system type is
Congratulations, you’re done!
If your system type is
If you are not sure of your system type or if you have other questions, call us toll-free at 1-800-468-1502. This thermostat works on 24-volt or 750 mV systems. It will NOT work on multistage conventional systems.
Enter System Setup
To enter the system setup, press and hold both the
Changing Settings
Function | Description Press the | Setting |
5 | select your heating system and optimize its operation | 5 Gas or oil furnace: Use this setting if you have a standard gas or oil furnace that is less than 90% efficient.6 Electric furnace: Use this setting if you have any type of electric heating system. 3 Heat pump, hot water or high-efficiency furnace: Use this setting if you have a hot water system or a gas furnace of greater than 90% efficiency. 2 Gas/oil steam or gravity system: Use this setting if you have a steam or gravity heat system. |
14 | select Fahrenheit or Celsius temperature display | 0 Fahrenheit temperature display (°F)1 Celsius temperature display (°C) |
15* | select Compressor Protection settings | 1 On0 Off |
20 | select clock display | 0 12-hour display1 24-hour display |
40 (RTH2300only) | restore program schedule to default settings | 0 Off1 On: Program schedule default settings are listed on page 11. |
Compressor Protection: This feature forces the compressor to wait approximately 5 minutes before restarting, to prevent equipment damage. During the wait time, the message “Cool On” or “Heat On” is displayed on screen.
Your new Honeywell thermostat has been designed to give you many years of reliable service and easy-to-use, push-button climate control.
Set: Press to set time/day/schedule.
Hold: Press to override programmed temperature control.
Run: Press to resume program schedule.
System Switch is used to control your heating or cooling system.
Temperature adjustment
Press the up or down buttons until you reach the desired temperature.
NOTE: Make sure the SYSTEM switch is set to the system you want to control (Heat or Cool).
Fan Switch is used to control your fan. In “Auto” mode, the fan runs only when the heating or cooling system is on.
If set to “On,” the fan runs continuously.
Program Schedule
You can program four time periods each day, with different settings for weekdays and weekends. We recommend the pre-set settings (shown in the table below), since they can reduce your heating/cooling expenses.
To adjust program schedules (RTH2300)
To adjust program schedules (RTH221)
Program schedule override (temporary)
Press
“Temporary” will appear on the display and the current program period will flash.
The new temperature will be maintained only until the next programmed time period begins.
To cancel the temporary setting at any time, press RUN.
NOTE: Make sure the thermostat is set to the system you want to control (heat or cool).
Program schedule override (permanent)
Press HOLD to permanently adjust the temperature. This will override the temperature settings for all time periods.
The “Hold” feature turns off the program schedule and allows you to adjust the thermostat manually, as needed.
Whatever temperature you set will be maintained 24 hours a day, until you manually change it, or press RUN to cancel “Hold” and resume the program schedule.
NOTE: Make sure the thermostat is set to the system you want to control (heat or cool).
This feature helps prevent damage to the compressor in your air conditioning or heat pump system.
Damage can occur if the compressor is restarted too soon after shutdown. This feature forces the compressor to wait 5 minutes before restarting.
During the wait time, the display will flash the message Cool On (or Heat
On if you have a heat pump). When the safe wait time has elapsed, the message stops flashing and the compressor turns on.
Install two fresh AAA batteries when Lo Batt flashes on the screen. Lo Batt appears for 60 days before the batteries are depleted.
Replace batteries once a year, or when you will be away for more than a month.
Most settings are stored in non-volatile (permanent) memory. Only the clock and the day must be set after you replace the batteries.
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Most problems can be corrected quickly and easily.
Display is blank
Temperature settings do not change
Make sure heating and cooling temperatures are set to
acceptable ranges:
“Cool On” or “Heat On” is flashing
“Heat On” is not displayed
“Cool On” is not displayed
For assistance with this product, please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If at any time during the warranty period, the product is determined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option).
If the product is defective,
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage that occurred while the product was in the possession of a consumer.
Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE-YEAR DURATION OF THIS WARRANTY.Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468 1502.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
yourhome.honeywell.com
® U.S. Registered Trademark.
© 2015 Honeywell International Inc.
33-00100ES—01 M.S. 07-15
Printed in the U.S.A.
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