Honeywell Thermostat Cool On Not Working – Quick Fix

In this tutorial, you will learn how to fix the Honeywell Thermostat Cool On not working.

If you are experiencing the Cool On Blinking issue for a long time on your Honeywell Thermostat, as I did when I first purchased it, it is recommended that you reset your thermostat once to resolve the problem.

‘Cool On’ on your Honeywell thermostat may be malfunctioning due to a variety of issues, and this article explains what those issues are and how to fix them.

This “Cool On” notification may flash for a brief period of time in rare instances. If it stops flashing after five minutes and the chilly air returns, there is no reason to be concerned.

This is actually a built-in safety function. It is meant to provide approximately five minutes for your compressor to warm up the system components. Additionally, if your air conditioner loses electricity, you may get this notice.

How To Fix And Troubleshoot Honeywell Thermostat Cool On Issue

Let us discuss all the troubleshooting methods that you can follow one by one to get to the root cause that is causing the issue and then fix that cause.

Note that you should only follow the below troubleshooting guide if your Thermostat is blinking Cool On for more than 5 minutes.

1. Check The Thermostat Mode

It is possible for a Honeywell thermostat to be adjusted incorrectly in some situations. For example, if there has been a recent power loss, your thermostat may be forced to go to the ‘Setup’ mode. Eventually, this will cause the terrible Honeywell cool on flashing problem.

1. Check The Thermostat Mode

Immediately make any necessary changes if you find that the system is in ‘Setup’ mode. You should also pay attention to the time on your thermostat. If the time is incorrect or not set at all, make certain that the proper time is entered. By checking that your system’s settings are correct, you can have the problem resolved in a matter of minutes.

2. Lower The Thermostat Temperature To The Lowest

If the room temperature is already lower than the temperature set on the thermostat, then the cool on the setting might not work.

To overcome this issue, you will need to set the thermostat temperature to the lowest value and make sure that the cool on mode is also on. When you set your thermostat, make sure its mode is set to “cool”.

Honeywell Thermostat Cool On Not Working

Keep in mind that, if your Honeywell Thermostat says it’s cool but no air comes out, make sure the fan setting is set to “Auto.” Doing this will let you check to see if your thermostat is good at controlling the temperature in your home.

Observe any fluctuations in the temperature while it is on the lowest setting. It’s also possible to experiment with various thermostat settings to determine if it’s making the appropriate requests for cooling.

There is a good chance that the problem is within the HVAC system if everything goes according to plan. If you think still the problem is not fixed then you need to read further for more troubleshooting options.

3. Make Sure That The AC Unit And Its Supporting Materials Are Properly Power

Your HVAC system may be to blame if the measures above haven’t fixed your thermostat-related problem. Make sure all of your equipment is connected up and all of the switches are switched on. Inspect the various power sources, connectors, sockets, etc., for any signs of damage.

Honeywell Thermostat Cool On Not Working

It’s also a good idea to look over your equipment for any loose or missing pieces. Make sure your AC unit is not producing any humming or clicking signs as these signs indicate that the AC unit is damaged and either needs to be changed or you will need to call the service people to repair it.

You can check the fuse of your AC Unit, Circuit Breaker as well for any possible damage. Try switching off all the equipment along with circuit breakers and then switch it on to see if the issue is fixed.

4. Check Thermostat Battery

Make sure that you are not getting low battery indication on your Honeywell Thermostat. If your thermostat battery is low then it might not work properly and most of the time it will malfunction.

Honeywell Thermostat Cool On Not Working

If you see the low battery indication, all you are required to do is buy a new set of batteries that are compatible and switch it with the old batteries already installed with your thermostat.

Also, you should search before replacing the battery as the steps vary from model to model.

5. Reset Your Honeywell Thermostat

A simple reset, just as with any other equipment or gadget, might sometimes solve the problem. If you want to reset your thermostat, keep in mind that doing so will erase all of your previous settings and programming. Some homeowners choose to write down their chosen settings before beginning the resetting procedure in order to keep track of what they want.

Honeywell Thermostat Cool On Not Working

Steps to reset your thermostat can vary based on the type you have. Your model’s menu button can be pressed or held until the options ‘Reset’, ‘Factory’, or ‘Factory Reset’ appear. ‘Menu’ can be found under ‘Preferences’ in some models. Search online for your specific model to learn how to reset it if you’re not sure how.

Do not reset your Honeywell thermostat until you have turned off the electricity to it, just in case.
Honeywell thermostats are easy to use if you’ve successfully reprogrammed them.

Wrap Up

I hope you were able to fix the Honeywell thermostat cool on the blinking issue. If you are still not able to fix this issue using the above steps then you should call Honeywell Customer Service as a last resort to this problem.

Make sure you are able to explain the issue to the customer service and also you should explain all the methods you already tried to fix this issue. This will help the customer service to try all other methods that you haven’t to troubleshoot the problem.

Let me know in the comment section if you were able to fix this issue using the above tutorial or not. And if I may provide additional help based upon your comment.

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Further Read:

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  2. What Is The Difference Between Honeywell T9 and T10?
  3. How To Connect Honeywell Thermostat To WiFi Quickly
  4. Quick Fix: Honeywell Thermostat Not Connecting with Google Home
  5. How To Connect Honeywell Thermostat To Google Home Device