How Do I Keep the Backlight on Continuously Honeywell Thermostat Rth658owf

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One of the things that I have always loved about my Honeywell thermostat display is that I can quickly read which mode I am on or what temperature my home is set to.

Sometimes, I even use it as a clock because it's bright and easy to read.

One afternoon, I was taking a little nap on my couch. I glanced at the thermostat to calculate the number of hours I could afford to sleep, and instead, I saw that my screen was blank.

So, I had to convert my nap time to 'research time' to determine what went wrong with the display.

I spent hours researching various user manuals and guides on the Internet and put together this comprehensible article to help others in my shoes facing the same issue.

The best way to fix the backlight of your Honeywell thermostat not working is by resetting your thermostat.

If that doesn't work, you should check the wiring and batteries.

Let's go through all the troubleshooting methods one by one. I would suggest that you follow the order given below to get the best results.

Dead Batteries that you might have to replace

If your Honeywell thermostat is battery-powered, the first thing you want to try is replacing the batteries.

They are probably dying and could lead to the display going blank or becoming unresponsive.

Obviously, you can easily get some new ones and fix the issue right away! However, even after changing the batteries, the Display might not work.

Faulty wiring

Not all Honeywell thermostats use batteries. So if your thermostat is wired into your house's electrical system, you need to make sure there aren't any faulty ones.

If you've installed your Honeywell Thermostat without a C-Wire, this process will be a lot easier.

Loose wires can, at times, be the reason for your backlight getting defective.

To fix the loose or broken connection, you will have to reset your circuit breaker.

Could be a tripped circuit breaker or a blown fuse

Another possible reason is a blown fuse or a tripped circuit breaker. Usually, a power surge can cause these problems in your house.

If the reason is a tripped circuit breaker, you just need to flip it back. However, a blown fuse has to be replaced.

If this is a one-time incident and the display turns on, you have nothing to worry about.

But, if the issue repeats, something could be wrong with your HVAC system, and you might need to get in touch with a professional.

HVAC safety switch might have flipped

The HVAC safety switch is a very important component as it ensures the safety of your device.

Unfortunately, sometimes, they take in false warnings, which could cut off the power supply to your thermostat. This will turn off your display.

If you can confirm that there is nothing wrong with your HVAC system, all you need to do is flip that switch back.

Otherwise, you need to consult a professional and fix the issue.

Your Furnace Door Might Be Open

If your furnace door is open or not tightly closed, then the backlight will stop working.

Some models of the Honeywell thermostats are more sensitive to this issue than others.

You can simply close the door of the furnace tightly to fix the display.

Reset the thermostat

A lot of issues that you come across can be fixed with a simple reset. But before you reset your Honeywell Thermostat, you'll have to Unlock your Honeywell Thermostat.

If your thermostat works on batteries, take them out for a while. Now insert them in the opposite direction and wait for about 10 seconds before putting them back in properly. Once it's back on, your display might work too.

If the thermostat you are using does not have batteries, go to 'Menu' and find the option to 'Restore to factory defaults'.

This will fix the display issue in no time.

Please keep in mind that the process of Resetting your Honeywell Thermostat varies according to the model that you own.

If you reset the device, you will have to configure it from the beginning. So, make sure you try out the other methods and reset your thermostat only if they don't work.

Your Thermostat Might Need Replacement

If your thermostat has been around for as long as you can remember, that could possibly be the issue.

Old thermostats will have trouble with the air conditioner, the heating pumps, and many other components.

The backlight going off could also be one of the many symptoms of your device getting old.

Usually, Honeywell thermostats do not wear out for at least 15 years. But if you think your device's lifespan is the reason for the backlight issue, you should get a replacement.

Why would you deal with all these problems when you can enjoy the fancy features of better models in the Honeywell family?

Shine a Light on Your Honeywell Thermostat's Display

The backlight going off is a pretty common issue for thermostats. Thankfully, there are a bunch of super-easy fixes, and all of them have been discussed above.

However, if you encounter the same issue frequently, it could mean that your backlight or even your thermostat has just gone bad.

In that case, please contact Honeywell support and get professional help instead of trying out troubleshooting methods.

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Frequently Asked Questions

Where is the reset button on Honeywell thermostat?

Most models do not have a reset button. Instead, you can go to 'Menu' and tap 'Restore factory defaults' to reset your thermostat.

The method varies depending on which model you own.

What is recovery mode on Honeywell thermostat?

When your Honeywell thermostat is in recovery mode, the thermostat is working towards an upcoming temperature set in the schedule.

How do I override my Honeywell thermostat?

To override Recovery Mode on a Honeywell thermostat, go to "Settings", select "Smart Response Technology" under "Preferences", and turn off "Recovery Mode".

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