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Honeywell Thermostat Cool On Not Working โ€“ 5 Easy Fixes

honeywell thermostat not cooling

Honeywell Thermostats are reliable and famous for manufacturing smart appliances for usersโ€™ comfort. These thermostats automatically set the room temperature. Have you been noticing issues with your Honeywell Thermostat cooling functions? If you want to troubleshoot your thermostat cool not working feature, read this article carefully till the end to help find some valuable tips and solutions.

Has your Honeywell Thermostat Pro series not cooling or been blinking for a long time and still not cooling the room? This issue is familiar and easy to troubleshoot, so you donโ€™t need to call any technician and waste money. Your thermostats should be set to โ€˜Coolโ€™ mode for the cooling unit to work. If youโ€™ve tried nothing, try these troubleshooting solutions to fix the cooling issue.


If your thermostat cool on feature stops working or keepsย blinking light, you do not need an expert to fix this. You can change batteries, decrease the temperature to its lowest settings, replace ac filters, and clean the clogged dirt in ac coils. Honeywell thermostat not showing the cool option provides heating/cooling temperatures, and if they stop working, it needs to be fixed.


First, inspect all the components of your Honeywell Thermostat and its HVAC system to see where the problem originates. This helpful and detailed guide will help you resolve the issue with the thermostat cool on not working and provide some practical solutions. Letโ€™s have a look at these:


Check the system settings of your Honeywell thermostat and see if it is set to its lowest temperature. The โ€˜Cool Onโ€™ mode should be turned on. Your thermostat cool should be โ€˜Autoโ€™ so that cool air comes out of the fan. If your thermostat has no cooling air, then it is not cooling the room as it should. If everything is normal, then there must be some issue with theย HVAC systemย of the thermostat.

Set Lowest Temperature in Honeywell Thermostat


Sometimes the issue can be in the main panel. If there was some power outage at your home, this affects the electrical appliances in use, such as your thermostatย keeps turning OFFย without any valid reason. Just like the โ€˜cool onโ€™ indicator keeps blinking for hours and does not stop. To fix this blinking, set up your thermostat. Once it is complete, it will stop the blinking. Also, see if the thermostat is set to clock and working correctly.

Honeywell Thermostat Setup Mode


Honeywell Thermostat not cooling functions for almost two months before showing the low battery indicator. Low batteries can be one of the causes your thermostat โ€˜cool onโ€™ keeps blinking. Due to drained batteries, the heating or cooling feature of thermostats malfunctions.

Go to your thermostatโ€™s display and see the battery level. Insert the batteries of the required voltage so that your thermostat performs well. Replacing the batteries can debug the Honeywell thermostat wonโ€™t switch to cool.


If none of the troubleshooting tips solves the cool ON not working, you must thoroughly examine your thermostatโ€™s HVAC system. Check all the wiring for any damaged/burned wires, and inspect all the sockets, fans and connectors to see if they are correctly connected to their respective terminals. Your thermostat needs a proper supply from the main power; ensure all the wiring is fixed. If the fuse is blown, get a new fuse. Turn off the circuit breaker, wait for 5 seconds and turn it on again. Flip back the circuit breaker if it was accidentally tripped.

Having a tripped circuit breaker can also cause your thermostatโ€™s screen to go blank and you will have to face other similar issues as well. So it is better to have your HVAC system examined before jumping on to the conclusions.

Examine HVAC System Of Honeywell Thermostat


It is recommended that all Honeywell users change their thermostatsโ€™ ac filters every three months. Dirty ac filters and clogged coils can be why the set cooling air is not reaching the room. You should thoroughly clean the filters and coils, as they have filled with clogged dirt for months and years. Due to this, proper heating or cooling is not coming out of them. Use a soft brush to clean the filters and coils. Clean them until they are clear and no dirt is left in them.


Q: How To Set Honeywell Thermostat To Cool?
A: You can set your Honeywell Thermostat to cool by setting the temperature to its lowest setting. Ensure the โ€˜Cool Onโ€™ mode is turned on. Keep it on โ€˜Autoโ€™ so that the fan let cool air pass through the ac filters. And your room is cooling according to the desired temperature.

Q: Why Wonโ€™t My Honeywell Thermostat Cool?
A: Due to dirt, the clogged ac filters are not letting the cool air pass through them. Clean the ac filters once every 3 months. Or simply replacing them can fix the issue.

Q: Where Is The โ€˜Resetโ€™ Button In Honeywell Thermostat?
A: The โ€˜Resetโ€™ button in most Honeywell Thermostats is the โ€˜Menuโ€™ option. The older thermostats use the fan button as the reset button.

Q: How To Permanently Hold The Temperature On The Honeywell Thermostat?
A: To hold the temperature permanently, toggle the temperature, and press the hold button until a message appears on the display. The permanent hold feature lets you end the auto schedules temperature and lets you set the temperature manually for an indefinite time.


The โ€˜Cool Onโ€™ indicator should resolve in 4-5 minutes, if it doesnโ€™t stop the blinking, use the given tips above to diagnose the issue and solve it. Make sure after activating the โ€˜cool onโ€™, you have properly closed the furnace door. The furnace switch should be ON. Iโ€™m sure if you carefully follow this helpful guide, the problem will be fixed soon.

If still you cannot resolve the Honeywell thermostat says cool but no air, call your HVAC expert so that they can send down the technician to resolve the issue. Hope you liked our guide. You may also want to have a look at our brief article about Honeywell Thermostat Heat on Blinking issue.

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