Honeywell Thermostat Not Working: How To Fix?

It is impossible to keep a home at a comfortable temperature without a thermostat. There can be a problem with a thermostat due to either software or hardware, as with many other appliances. However, if Honeywell Thermostat is not working follow our guide mentioned below to get it fixed.

A My Honeywell Thermostat Not Working a few days ago. Neither display worked, and neither system worked properly.

As opposed to seeking professional help, I resolved the problem by troubleshooting it myself.

It is quite common for thermostats to malfunction, so you can perform a few troubleshooting steps to fix the problem.

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Much of the information available on the Internet is fragmented, despite its wealth. This article includes information to help you troubleshoot if your Honeywell Thermostat Not Working.

It contains an article where you can discover what kind of thermostat you have and what the best way to troubleshoot it is.

If Replacing the Honeywell Thermostat batteries or performing a honeywell thermostat reset will fix the issue.

Which Thermostat Model Should I Use?

Honeywell Thermostat Not Working
Honeywell manufactures three types of thermostats. The type of thermostat in your home can be determined by several small things.


A A manual thermostat will usually have a dial on top, similar to the dial on a microwave to control the temperature.

Older buildings rarely have manual thermostats today and older homes usually do.


 You probably have a programmable thermostat with a digital screen unless you have a companion app. You can also navigate the menu by using the buttons on the screen.


You can change the settings on most smart thermostats by pressing a few buttons and viewing a large, bright display. It is possible to access most of its functions via a smartphone or tablet that has the companion app installed.

 Your Honeywell thermostat’s model number can be found on the ID card that comes with it.

 When you do not have your ID or are renting an apartment, you can find the model number by removing the thermostat from the wall plate.

Honeywell thermostats can usually be pulled out of wall plates by simply pulling them. You can also slide or flip them out of the way. A model number appears on the back.

When you suddenly jerk or mishandle your thermostat, it can be damaged. If it is not easy to remove, don’t mess with it.

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Problems with Honeywell thermostats

Honeywell Thermostat Not WorkingIt A thermostat can be troubleshooted easily. The main challenge is determining where the issue is coming from. The following list provides an overview.

There is no information displayed on your Honeywell Thermostat: Honeywell Thermostat Not Working?

The display can go black for several reasons:

  • Draining the battery
  • Outage of electricity
  • Turn on the furnace
  • Disconnected C-wire

To The solution to the problem is to replace the batteries in a programmable thermostat. Be sure the wiring has not been tampered with if it is a manual or smart thermostat.

 Ensure your air handler and furnace are receiving power (the switch should be on) and that all doors and panels are closed tightly on the cabinets.

 It If the problem persists, it may be necessary to replace the thermostat. Troubleshooting blank displays is not possible.

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HVAC Unit Isn’t Working

Honeywell Thermostat Not WorkingThe following problems can occur with HVAC systems:

  • Cool air is emitted when it is in heat mode.
  • The system has not responded.

 Before freaking out about a broken HVAC system, check that your thermostat is set to “cool” or “heat,” depending on the situation. Do not shut off the HVAC system.

As Further, if you are setting the temperature, you should either set it higher or lower than the ambient temperature in the room.

A closed air handler door or furnace cabinet door is also required if the HVAC system is not working properly.

If In the event none of the solutions above work, the circuit breaker should be reset. When the system returns to normal operation after five minutes, the compressor will turn on.

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“Heat On” or “Cool On” is blinking

Indicators that indicate ‘Cool On’ and ‘Heat On’ indicate what system is running at a given moment. Neither of the indicators will be displayed if your thermostat is off.

You need not worry, however, if the “Cool On” or “Heat On” indicators are blinking because your system is in a five-minute delay. The compressor is protected because of this safety feature.

It If the power goes out and is suddenly restored, the thermostat won’t short circuit.

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Identifying and fixing faulty Honeywell thermostats

Honeywell Thermostat Not WorkingIf your Honeywell thermostat is faulty, you can try the following methods:

Change the Batteries

In A change of batteries restores the original state of the system settings, preventing any errors caused by software bugs.

  • All thermostat wires must be disconnected. Connect the wires in the same order.
  • Remove the wall plate from the device.
  • Wait for five minutes after removing the batteries.
  • Batteries should be replaced and wires should be connected.
  • Wait five minutes after turning on the system.

Changing the batteries may not resolve your Honeywell Thermostat Not Working problems.

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Check for any Power Disruptions

In most cases, thermostat problems are caused by a network connection problem.

Wires are either broken or power is interrupted for some reason.

To ensure that your Honeywell thermostat is operating properly, ensure that there are no breaks in the wiring, and that there is power.

Make sure the air handler doors/panels or the furnace cabinet doors are also in good repair. There is a safety feature built into Honeywell systems that turns on if either of the openings is not properly closed.

The HVAC system will stop working if this feature is turned on.

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Fixing blinking “Cool On” Light

If It usually means that the thermostat’s compressor is being kept from malfunctioning by the safety timer tripped during kickstarting.

In You do not need to troubleshoot if honeywell thermostat cool on not working. After five minutes, the safety feature is turned off.

Nevertheless, if it does not automatically turn off, here are the steps to take:

  • Make sure the temperature setting is set to the lowest possible setting. Use the automatic fan setting.
  • Turn off the thermostat timer and ensure that it is not in setup mode.
  • The battery low indicator should be on.
  • Ensure that the furnace’s openings are all closed.
  • Make sure the AC filter is not clogged.
  • Make sure the AC coils are clean.
  • Use the above battery change method or go to the menu and select factory reset. Smart thermostats can only be reset this way.

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Fixing the blinking “Heat On” light

If As the ‘Heat On’ light blinks, the thermostat’s safety timer has been tripped to prevent it from malfunctioning.

In You do not need to troubleshoot in this case. After five minutes, the safety feature is turned off.

Nevertheless, if it does not automatically turn off, here are the steps to take:

  • Set the temperature setting to the lowest temperature available. Also, ensure the fan is set to auto.
  • Ensure the thermostat timer is turned off and is not in setup mode.
  • Check if the battery low indicator is on.
  • Make sure all the furnace openings are shut.
  • Reset it either using the above-mentioned battery change method or find the factory reset option in the menu. The latter will only work on smart thermostats.

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How To Reset Honeywell Thermostat After A Battery Change

If your thermostat is not working after changing the batteries, you might want to reset it. You may be able to resolve any thermostat problems by clearing out old preferences.

The steps for resetting your thermostat may vary, but essentially, you must follow the following steps:

  • The thermostat battery compartment should first be removed from its wall baseplate after turning off its breaker switch.
  • All old batteries should be removed from their slots and replaced with new batteries that are correctly positioned (check the user manual for the correct size and type).
  • If you want to trigger a factory reset on some thermostats, you have to place the batteries in the wrong orientation for about 10 seconds. You can, however, restore factory settings if your thermostat has a touch screen by going to the Menu button > Preferences Menu > Restore Factory Settings.

Upon completion of these steps, verify that no error messages appear on the thermostat display.

Now that you’ve reset your thermostat to factory settings, you should be able to set it up correctly. Now you can reset your schedule.

It’s not hard to troubleshoot Honeywell Thermostat Not Working

Honeywell Thermostat Not WorkingTroubleshooting Honeywell Thermostat Not Working is pretty straightforward. The problem can be caused by either a hardware problem with the thermostat, or by setting the thermostat too high or too low. If you have checked the batteries, wiring, and furnace door and still have not found the issue, the thermostat either has a hardware issue, or you are not setting the thermostat properly.

To The permanent hold method ensures the temperature settings of the heating and cooling system are optimal.

To permanently hold a button, you only need to long hold the arrow that says ‘Up’ (for heating) or ‘Down’ (for cooling).

Changing the thermostat setting will manually change the outdoor temperature to the setting on the thermostat.

 It If none of the above methods work, it might be necessary to seek professional help.

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Be sure to check your warranty!

Lastly, before replacing or repairing anything, it is always a good idea to check the warranty on your thermostat. If your thermostat’s batteries need to be replaced, you should check whether the warranty covers it (or not).

Furthermore, if you’re not careful, you may void your warranty if you take actions that void the warranty. When dealing with thermostat problems, consulting your warranty will give you a much better idea of what can be fixed and which should be left to the pros.

Frequently Asked Questions

Does the Honeywell thermostat have a reset button?

You can either use the battery change method or select the factory reset option from the thermostat’s settings to reset the thermostat.

The Honeywell thermostat has a recovery mode. What does it do?

In recovery mode, the thermostat attempts to maintain a temperature that is higher or lower than the outside temperature.

Is there a way to bypass Honeywell’s recovery mode?

Honeywell thermostats have a setting for bypassing recovery mode. Recovery mode can also be programmed to meet your preferences. 

Final Thoughts

In conclusion, if your Honeywell thermostat is not working, there are a few potential causes that you can check and troubleshoot. These include issues with the thermostat’s batteries, problems with the wiring, or issues with the HVAC system itself. Before calling a professional, it’s a good idea to try some basic troubleshooting steps such as checking the batteries, checking the wiring connections, and making sure the thermostat is set to the correct mode. If these steps do not resolve the issue, it may be necessary to call a professional for further assistance.

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