How To Fix It

Does Your Honeywell Thermostat Keep Turning Off? 3 easy checks

What would make your Honeywell thermostat keep turning off on its own? Without a properly functioning thermostat, you won’t be able to control your heating and cooling system. That’s why it’s important to understand what can force the device to shut down.

Two main things will make your Honeywell thermostat keep turning off: the device is overheating, or it has a malfunctioning component. The HVAC system can also make the thermostat turn off – a clogged condensate line, insufficient airflow, and short cycling might be to blame.

Why Does my Honeywell Thermostat Keep turning Off On Its Own?

Your thermostat might be turning off because:

  • The actual thermostat had gone bad
  • The condensate line is clogged
  • The level of refrigerant is low
  • The system is not receiving enough airflow
  • The HVAC system is short-cycling

Read: Honeywell Thermostat Not Reaching Set Temperature? Here Is Why

Why Does My Thermostat Keep Turning Itself Off?

The thermostat is overheating

If the device has to work too hard to maintain the desired temperature, it might overheat. Once the temperature of the thermostat goes above a certain limit, it will shut itself down.

In the majority of cases, the device will turn back on as soon as it gets a chance to cool.

Low airflow

Dirty air filters, closed or blocked air supply vents, a dirty blower wheel, defective ducts – all these things can prevent enough air from reaching the HVAC system.

dirty blower wheel


The thermostat can get turned off if the HVAC unit is short-cycling. This may happen due to insufficient airflow or improper thermostat settings, as well as a faulty temperature sensor.

Read: Honeywell Thermostat Troubleshooting Guide

Wireless Thermostat Keeps Turning Off

When it comes to the thermostats that can get connected to Wi-Fi, all of the reasons mentioned above can make the device turn off.

However, there is another thing that you should be aware of, especially, if you have a wireless thermostat. The device might simply be auto-updating.

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While the thermostat is receiving the update, it might turn off. Make sure that the device has a proper connection and give it enough time to finish up the updates.

Honeywell Thermostat Goes Blank Then Comes Back On

A thermostat going blank and then turning back on again is the main sign of a short cycling HVAC system.

This might be happening, if you have placed the device in the wrong location. Thermostats should not be installed too close to doors or windows, in direct sunlight, and close to air vents.

An improperly sized HVAC system might also make the heating and cooling unit and the thermostat short-cycle.

If the HVAC system is way too large for your home, it will end up cooling or heating the space too fast. As a result, the unit will be turning off and on more frequently.

home HVAC system - two heat pumps

Read: Temperature Thermostat Problems

How Do I Get My Honeywell Thermostat to Stay On?

If you have a programmable Honeywell thermostat, it will, at one point, start following a certain schedule. For the days when you would want the device to forget about the schedule and keep running at a certain temperature, there is the ‘hold’ button.

Simply adjust the temperature and press hold. You’ll get to choose whether you want the temperature change to be temporary or permanent.

Honeywell thermostat keep turning off

Why Won’t My Honeywell Heater Stay On?

Such heaters usually have a screen on the air inlet. This component can get blocked by dust or lint and this, in its turn, is going to block the airflow.

When the flow of air is blocked, the unit can overheat and trigger a safety switch. If that’s the issue, simply cleaning the screen should fix the problem.

There might also be something blocking the opening of the orifice. It can be dirt or an insect, for example; in such a case, the safety valve will stay closed.

Honeywell Thermostat Not Turning On

To make your thermostat turn on, you can try:

Replacing the batteries

If you have a battery-operated Honeywell thermostat, then you can start by replacing the old batteries. Don’t forget to switch the power to the device off at the circuit breaker beforehand.

Thermostat batteries

Replacing the air filter

A clogged filter can make your HVAC system malfunction which will also affect the thermostat.

Checking the circuit breaker

Simply make sure that the thermostat is receiving power. 

Checking the wiring

Remove the face of the device and have a look at the wires. Make sure that they are not damaged and that all connections are tight.

Resetting the thermostat

A lot of thermostat-related problems can be solved by a simple reset. Reset the device to the factory settings and see if that helps.

Read: Benefits Of A Programmable Thermostat

Honeywell Thermostat Keeps Going Offline

Before trying to reconnect, you can do the following:

  1. Remove the device from the wall for 30 seconds.
  2. Reattach the face plat.
  3. Try to connect the thermostat to a mobile hotspot.
  4. Only after that, you can perform a Wi-Fi reset to try and ‘move’ the thermostat to the Wi-Fi network.

What Do You Do When Your Honeywell Thermostat Stops Working?

  • Replace the batteries
  • Check the circuit breaker
  • Check the indoor unit (all panel doors have to be closed)
  • Ensure that the HVAC units are receiving power
  • Check the wires
  • Make sure that the date and time are set correctly

What Is Hold Button on Honeywell Thermostat?

When you push the hold button after adjusting the temperature, you are telling your thermostat to maintain this temperature for a certain period of time.

How Do I Manually Override My Honeywell Thermostat?

Programmable thermostats stick to a schedule. If you want to override these settings, you can adjust the temperature and initiate a temporary or permanent hold.

How Do You Reset a Honeywell Thermostat?

Honeywell thermostats don’t have actual reset buttons.

To reset T-series devices to the factory settings, you would have to:

  1. Hold the MENU button for about 5 seconds.
  2. Select RESET.
  3. Select FACTORY.
  4. Select YES after the thermostat asks you ‘are you sure?’.

How Do You Manually Reset a Thermostat?

This method works on all battery-operated thermostats.

  1. Turn the device off.
  2. Remove the batteries and put them back in backward.
  3. Leave them like that for at least 5 seconds.
  4. Remove the batteries and reinsert them as you would normally do.

How Do You Clean the Sensor on a Honeywell Thermostat?

If your thermostat model has a removable cover, you can dust the inside with a soft brush. To clean the contacts, use a piece of paper – simply slip it between the contacts and gently move back and forth.

Read: No Power To The Home Temperature Thermostat – Troubleshooting Guide

How Do You Hack a Honeywell Thermostat?

If your thermostat doesn’t go below a certain temperature, you can use this hack to bypass the device’s temperature limiter. 

Do Honeywell Thermostats Go Bad?

You can generally expect a Honeywell thermostat to last for around 10 years. Even though these devices don’t really have a set lifespan, they will start malfunctioning after a decade or so.

This happens mainly because of aging wires, dust accumulation, and the general wear and tear of the thermostat’s components

How Do You Know If You Need a New Thermostat?

  • The thermostat is over 10 years old
  • The heating and cooling system does not turn on or off
  • There are frequent temperature fluctuations
  • The thermostat is unable to correctly read the temperature
  • There has been a recent spike in your energy bills

Will Low Batteries Affect Thermostat?

It goes without saying that the thermostats that need batteries in order to operate, will not work if the batteries are dead. You’ll see a blank screen and your heating and cooling system won’t be functioning at all.

However, low batteries can also affect your device.

  • The HVAC system won’t be able to run as effectively
  • If there is a power outage, a thermostat with low batteries might lose all its programming
  • The display can go blank, even when there is still a bit of battery life left. In such a case, you won’t be able to control the HVAC system.