Sections in this Manual
- Turn Off Power to Heating/Cooling System
- Remove Old Thermostat
- Label Wires with Tags
- Separate Wallplate from New Thermostat
- Wallplate
- Connect Wires
- Install Batteries
- Install Thermostat onto Wallplate
- Turn Power Back On
- Advanced Installation
- Changing Settings
- About your new thermostat
- Thermostat controls
- Program Schedule
- Built-in compressor protection
- Battery replacement
- Troubleshooting
- Warranty
- FAQs
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
- Display is blank: Make sure fresh AA alkaline batteries are correctly installed
- Temperature settings do not change: Make sure heating and cooling temperatures are set to acceptable ranges:
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C). - Cannot change system setting to Cool
• Check Function 1: System Type to make sure it is set to match your heating and cooling equipment - Fan does not turn on when heat is required
• Check Function 3: Heating Fan Control to make sure it is set to match your heating equipment - Heating or cooling system does not respond
• Press SYSTEM button to set system to Heat. Make sure the temperature is set higher than the Inside temperature.
• Press SYSTEM button to set system to Cool. Make sure the temperature is set lower than the Inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond. - “Cool On” or “Heat On” is flashing
• Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor - Heat pump issues cool air in heat mode, or warm air in cool mode
• Check Function 2: Heat Pump Changeover Valve to make sure it is properly configured for your system. - Heating and cooling equipment running at the same time (or heat does not turn off)
• Check Function 1: System Type to make sure it is set to match your heating and cooling equipment.
• Grasp and pull thermostat away from wallplate. Check to make sure bare wires are not touching each other. - Heating system is running in cool mode
• Check Function 1: System Type to make sure it is set to match your heating and cooling equipment
For assistance with this product, please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.
Warranty
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 ma functions, Honeywell shall repair or replace it (at Honeywell’s option).
If the product is defective, (Honeywell Programmable Thermostat)
- return it, with a bill of sale or other dated proof of purchase, to the place from which
you purchased it; or - call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address:
Honeywell Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr. N., Golden Valley, MN
55422, or whether a replacement product can be sent to you.
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 which 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.
FAQs
will this work to replace old round 24 volt thermostats for a hydronic gas fired boiler system with NO A/C?
Yes, this model is compatible with Hot water systems with or without pump.
How do you erase or reset the program?
you can only resubmit a new setting in order to erase an old one.
Mine doesn’t run the fan for ac when set to auto but does when set to on. the heat works fine when set to auto. is it defective?
Definitely give them a call as Ed said. You can also try this. Put the t-stat to off and remove the faceplate/electronics. Slide the switch back and forth from heat/off/cool a bunch of times and see if that cleaned up the switch contacts. Also make sure your jumper settings are correct.
How many pins are on the back of this switch?
This model has 8 pins going into the letter terminals.
Does the backlight stay on?
No. You can see the display without a backlight.
What are the program times?
Program times are completely programmable, set any times that you want
I have a Bryant 90 gas furnace with heat pump. The description says it will work with auxliary heat. Is this unit compatible?
I believe so. I checked with my landlord about this same issue and it worked
Does it comes with an user manual?
Yes, it comes with a manual.
Can this replace a honeywell chronotherm iv plus
I don’t think so, but I used mine to replace the exact same model, so I don’t know for sure.
Will this thermostat work with a York heat pump with a two stage compressor?
Jean the RTH2410B will work with a1 Heat/1 Cool Conventional or 2 Heat/1 Cool Heat Pump.
Need programing instruction my t’stat is rth221b1021a. this was bught and installed nearly 10 years ago
please find the link to the installation menu below:
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-2448ES.pdf
I was considering replacing a mechanical thermostat with this model. Will it reduce oil usage?
The key to decreased oil usage is properly programing the thermostat. Program to lower heat at night when you are under covers and turn back on 1/2 hour before you get up. Lower the temp in the day-if you work outside the home. This of course is most effective if you have forced air heat and not a boiler, but it should still reduce consumption with a boiler
Does it chirp when needing batteries?
No, says battery low
Are the two AAA batteries supposed to have terminals face each other?
The batteries are not supposed to have the terminals facing each other. We recommend you installing the batteries in the normal way: negative-positive-negative-positive.