Honeywell thermostat keeps turning off and on

Honeywell thermostat keeps turning off and on

The thermostat is said to be the heart of your home’s cooling and heating, it also saves you more money in your monthly bills. Imagine one day your Honeywell thermostat stops working or your Honeywell thermostat keeps turning off and on frequently.

What should you do to fix it and make it run perfectly like before?

Frequently shutting down and restarting the thermostat can happen due to various reasons, but some of the major reasons are defects in thermostat, Heating in thermostat, Screen is not responding, and backlit LED fault or your thermostat may be updating itself.

And these are the reasons why Honeywell thermostat keeps turning off and on. 

As I faced the same problem in my home, I researched a lot on the internet to ask the customer support but finally, after talking to all of them, I learned some more things about Honeywell thermostat besides the problem I face in my thermostat.


There is a wide range of thermostats that can be used at home. Different companies make their thermostat differently, but according to what they do and how they work to make our home temperature comfortable is the same in all the thermostats.

Thermostat for Home use are –

1. Non-programmable thermostat

2. Programmable thermostat

3. Smart thermostats

4. Smart thermostat with Artificial intelligence

1. Non-Programmable thermostat:- 

Non programmable thermostat

Non-Programmable thermostats are the lowest model good thermostat you can buy nowadays. These types of thermostats are manually controlled thermostats.

You can’t schedule your weekly temperature setting in these types of thermostats.

All the control you want like temperature change to increase or decrease the heat in the home you have to go to near the thermostat and adjust your temperature manually by clicking the buttons.

2. Programmable thermostat:- 

Programmable thermostat

These types of thermostats are smarter than those Non-programmable thermostats because it has some memory to store some data of your weekly or monthly temperature settings.

You can save your weekly or monthly temperature setting according to your comfort. Programmable thermostats have the ability to control your home HVAC system as you come home from the office or leave to the office, reducing the time your home takes to maintain the setting following your set schedule.

Some programmable thermostats have wifi connectivity which makes it controlled via your smartphones.

3.Smart thermostats:- 

Honeywell ProSeries thermostat

Smart thermostats are the first thermostat that comes with some smart features like recovery mode, wait mode, and so many features to take advantage of the betterment of your home temperature and saving your electricity consumption.

With a smart thermostat, you can also connect smart sensors for more accurate temperature differences from room to room, room to the kitchen, and hall.

It can decrease your HVAC system energy consumption more than programmable thermostats. And can be controlled with the APP from your mobile, tablets, and your laptop.

4.Smart thermostat with Artificial intelligence:-

smart thermostat with AI

These types of thermostats are just introduced in the thermostats markets.

It is the Smart thermostat with artificial intelligence to learn your daily routine pattern and make your home temperature maintained by following your daily pattern.

It can save your monthly energy consumption more than any thermostat in the market.

Why your thermostat goes blank then comes back on

As I mentioned above in this article, There are several reasons why your Honeywell thermostat keeps turning off and on. I will tell you each and every reason why your thermostat behaves like this.

Find out if your thermostat relates to these problems and take the required action to fix your thermostat.


If you’re using battery-operated thermostats, then the most common reason thermostats start turning off and on by itself is “Weak batteries”.

Insufficient charge in the battery causes your thermostat to keep turning off and on frequently. Battery operated thermostats need sufficient power to keep your thermostat running efficiently.

If you forgot to charge the battery and your thermostat keeps running with the weak battery, it can affect your home HVAC system seriously. Have you ever thought about what could happen with a weak thermostat battery?


A blown fuse can also make your thermostat behave abnormally. A fuse is used in every electronic device to protect the device and wiring from overvoltage and short circuit.

When a fuse burns then the thermostat cannot operate efficiently. And make your thermostat go black sometimes or warn you about the fuse being blown with screen icons and some thermostat with audio beep signal.

If you found any issue with the fuse then I recommend calling customer support service or change it yourself if you can.


If the wiring in your home is getting an issue of short circuits of loose connections, then it can also be the reason why your thermostat keeps turning off and on frequently.

Loose wiring and faulty wiring should be checked on a monthly or yearly basis to keep your home wiring system future proof. Also, check the thermostat connecting wire for any loose wiring in the thermostat.


We all know that Honeywell always keeps its customer’s satisfaction his first priority. All the devices they make goes through the quality check before dispatching to the warehouse.

But sometimes if they miss one by mistake then maybe it is yours. Chances of Honeywell thermostat getting manufacturing defects is less than 0.01%. And if you get one they will happily replace it with the new one.

If your thermostat is old enough to get some faults over time then you should call the support staff to fix it for you.


Your thermostat screen is lit up with the supporting backlit LED if they get any issues in the light then your thermostat looks like it turned off. The screen goes blank in this case.

To find out the backlit problem in your thermostat, check your HVAC system if they are working properly as scheduled then the issue is with your thermostat screen backlit.

You can also check by controlling your home HVAC system with your mobile app.


The thermostat controls your home HVAC system to maintain the desired temperature and if your thermostat works too hard to maintain the required temperature then your thermostat gets a little heat up.

If the temperature of your thermostat crosses the set limit, turn off itself to save the thermostat. And when it cools down then it gets On automatically and starts maintaining your home temperature again.


Screen not responding and screen freeze happens in some thermostat. If you notice and the screen freezes or the screen is not responding in your thermostat, then after some tries the thermostat starts restarting to refresh the system.


As thermostat keeps getting smarter they need to be updated to its latest version available. Honeywell sends Its update via OTA which needs to be updated to get all the features available in your thermostat.

Updating the thermostat required internet connection and your thermostat must be connected to the internet while updating.

After the thermostat completes the update download it starts installing it immediately and while installing the update in your thermostat it restarts several times in-between updates.


When all your HVAC system depends on your thermostat then think about the day or time when your thermostat stops working. And you have to spend the night without your HVAC system.

If it happens then you’ll feel like real uncomfortable temperature all over your home. A dead thermostat can make your home temperature uncomfortable.


As far we learned that, If Honeywell thermostat keeps turning off and on again and again then you should check these options to find the fault/defects. To keep your thermostat fit to run for a long duration of time. Don’t skip to recheck your thermostat for all the points mentioned above.

Always follow manufacturer guidelines or expert advice before making any change or try to repair by yourself alone. Keep one person with your while performing the task.

2 thoughts on “Honeywell thermostat keeps turning off and on”

  1. Pingback: [Why upgrade?] Thermostat With Remote Sensor – Get things for homes

  2. James Middleton


    My TH6320u2008 Honeywell Thermostat mode button stop working and not allowing me to change to heat or cool or off after a while i had to turn the power off to get it cut off. but it’s still not working

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