Hands removing and older style thermostat cover.

Has your Honeywell thermostat become unresponsive, or is it displaying an incorrect temperature? Honeywell thermostats are very reliable and efficient in maintaining an energy-efficient and comfortable environment. But they may stop working or show a blank screen due to a dead battery or a problem with the wiring.

Even after changing the battery, if your Honeywell thermostat is not working, check the battery size and calibrate the thermostat.

You should keep your thermostat clean and avoid the build-up of dirt and grime, as they can have an adverse impact on the functioning of your thermostat. Loose wiring can also stop your Honeywell thermostat from turning on your HVAC.

From unresponsive displays to a constantly running HVAC system and inaccurate temperature readings, there can be many issues with your Honeywell thermostat.

Let’s take a look at signs that might indicate your thermostat is not functioning well and the Honeywell thermostat reset procedure.

How to Know if My Honeywell Thermostat is Not Working

There are a few signs that might indicate your Honeywell thermostat has gone bad and is not working efficiently. 

1. Unresponsive Thermostat

Unresponsive Thermostat

If your Honeywell thermostat has stopped working completely, it may be because your thermostat is not getting power. A blank or unlit display can be an indicator of a malfunctioning thermostat.

To resolve this issue, check whether the thermostat is connected to a 24-volt AC power source. If the Honeywell thermostat is not connected to the right power source, the screen won’t power up.

If everything looks good, there might be an issue with your battery. Check the batteries, and if they are dead, replace them and see if it works. Not being able to read the temperature is a sign that your thermostat needs new batteries.

You may have to reset your Honeywell thermostat if the problem has not been resolved even after trying out these steps. To reset your thermostat, you’ll have to turn off the thermostat’s power at the breaker box. Turn it back on after a few minutes. This will reset the thermostat, and it will start working again.

2. Flickering Thermostat

Flickering Thermostat

Does your Honeywell thermostat keep flickering? If yes, you can try replacing the batteries, as they may have become dead. In some Honeywell models, you’ll even get a low battery notification, which indicates it’s time to change the batteries.

If the problem persists even after changing the battery, there could be issues with the flame sensor, electrical components, or something blocking airflow.

You should keep up with timely maintenance, like inspections and changing air filters, to resolve these issues. If your Honeywell thermostat is flickering, it might be in delay mode because it has detected a few issues and has shut your system down temporarily.

You can call an expert to address this issue if you’re unable to resolve it on your own. 

3. Thermostat Not Cooling

Thermostat Not Cooling

Another common issue with the Honeywell thermostat is that even though it is set to cool, it is not cooling your house. If you encounter this issue, there may be a problem with the hardware of your AC. In this case, you’ll have to look for problems like a tripped breaker or a blown fuse. It is also important to verify that you have switched the thermostat to cool mode and that the cooling point is set below the room temperature reading.

If you find that the thermostat is set for cool, check that the power switch of the furnace is set to On and the furnace door is securely closed. If you have set your Honeywell thermostat to cooling for the first time or this is a new installation, check that the wiring was matched correctly to the new thermostat from the old one. 

4. Thermostat Reading is Not Same as the Actual Temperature

Thermostat Reading is Not Same as the Actual Temperature

Have you noticed that your Honeywell thermostat temperature reading is not the same as the actual temperature? If yes, there may be a problem with the temperature sensor. If your air filters are dirty, your room temperature will differ from the thermostat setting. In this case, you’ll either have to buy a new thermostat or replace the broken sensor.

Dust inside the thermostat, corrosion, and frayed wiring can also prevent your thermostat from working correctly. You should replace your thermostat if it is older than fifteen years and can’t maintain the temperature of your room.

5. The Thermostat Doesn’t Connect to Wifi

The Thermostat Doesn’t Connect to Wifi

Are you facing connectivity issues with your Honeywell thermostat? If your Honeywell thermostat suddenly goes offline, it may be because of a disrupted Wi-Fi connection. In this case, you will have to check that your thermostat is within the Wi-Fi router range.

If it is, you will have to check the router’s settings to see if the Wi-Fi network is broadcasting and enabled. Honeywell WiFi thermostats only run on the 2.4 GHz frequency.

If you have newer routers, they can operate on multiple bands, like 5.0 GHz and 2.4 GHz. Check that your router has the correct frequency to allow it to connect with your thermostat.


If you have recently purchased the Honeywell thermostat and it went unresponsive while using or during the installation process, you can try out a few quick fixes to resolve the issue.

From blank display screens to heating and cooling issues, many signs may indicate your thermostat has gone bad. You can check out the solutions mentioned above to resolve these issues and enjoy a comfortable temperature at your home. If none of these solutions work, you can contact an HVAC expert.

To avoid running into any problems with your thermostat, read the instruction manual before using it. 

Frequently Asked Questions

What are the Common Issues that You May Encounter with Your Honeywell Thermostat?

Unresponsive displays, a constantly running HVAC system, and inaccurate temperature readings are some common issues you may encounter with your Honeywell thermostat. Your thermostat may also have gone offline suddenly or flickered and entered delay mode. 

How Can You Avoid Future Issues with Your Honeywell Thermostat?

You can avoid future issues with your Honeywell thermostat by keeping it clean and preventing the buildup of dirt and grime. It would be best if you also got your thermostat serviced regularly to ensure it performs well.