How to Fix Honeywell Thermostat Backlight Not Working?

Is your Honeywell thermostat backlight not working? In technical words, a defective backlight prevents the thermostat from performing any of its tasks, rendering it useless until the backlight is repaired.

If the Honeywell Thermostat backlight is not working, it is because an access door on your HVAC system isn’t entirely closed. When the door is completely closed, some types of devices have a switch that activates the mechanism.

Another typical reason is that the circuit breaker has been tripped.

Below we will go over some of the most typical reasons your Honeywell’s thermostat backlight isn’t working.

Reasons Why Your Thermostat Display Isn’t Working

Here are some of the most frequent causes for a blank thermostat screen:

• Problems with the wiring
• The thermostat isn’t working.
• The circuit breaker went off.
• The Safety Switch on Your Air Conditioning and Heating System Has Been Triggered
• There’s a problem with the electricity.

It’s critical to establish the problem’s core cause before moving on to a remedy. Only then will you be able to troubleshoot the issue successfully and efficiently.

We’ll walk you through troubleshooting and determining the exact cause of the problem in this article.

How to Fix Honeywell Thermostat Backlight Not Working?

Method #1. Check the Batteries

The malfunction of the thermostat backlight can be caused by a variety of factors.

If the backlight on your Honeywell thermostat isn’t working, the first thing to check is whether the batteries are dead and need to be replaced.

The display is either blank, unresponsive, or flashing. Second, you can’t configure the Honeywell thermostat for continuous backlight if it’s battery-powered.

This can be readily solved by:

1. Removing the wall unit’s cover.
2. It’s time to replace the batteries.

Once the display returns, you may need to reset the machine and reprogram your settings.

Method #2. Blown Fuse And A Tripped Circuit Breaker Fix

If your fuse is blown or you have tripped a circuit breaker, this can cause the backlight of the thermostat to not operate correctly.

This problem is most likely caused by a surge.

Step 1. If the circuit breaker in your electrical box has tripped, you can simply flip the switch back on. When your backlight stops working, this is a simple fix.

Step 2. If your fuse is blown it is necessary to repair a blown fuse. Check the thermostat once it’s been replaced. Your problem is solved if you have power.

However, if the replacement fuse blows or the circuit breaker trips again, there is most likely an issue with the HVAC system. For this purpose, you need to contact a specialist.

Method #3. Check The Thermostat Door

The backlight stops operating and the thermostat shuts off if the thermostat door is held open or not closed tightly.

This is the most prevalent problem that our customers encounter. Some thermostats, however, are more susceptible to this type of problem than others.

To fix this issue you can simply:

• Easily shut the furnace door tight.
• This will eliminate any backlighting issues.

Method #4. Look For Loose Wiring

A loose wire on the rear of your thermostat is one of the most common causes of no reaction on the screen.

To fix this, you’ll need to take off the thermostat cover.

1. Grab the sides and gently pull.
2. Remove the 2-4 screws that may have been used to secure the base to the wall.
3. A bundle of thin wires should be visible.
4. You’ll want to keep an eye out for any missing wires on the fastening screw.
5. Glue them back together.

If this does not resolve the problem, you may need to hire a specialist.

Method #5. Check The Thermostat Safety Switch

The tripped safety system is critical because it ensures your thermostat’s safety.

Wiring signals can sometimes interfere with turn-off signals, or the thermostat may not get the right information, resulting in the HVAC system not displaying the screen correctly.

This is among the causes of why the backlight on your thermostat isn’t functioning correctly.

If it’s the thermostat, you’ll need to get an expert to diagnose and fix it.

Step 1. Check the condensate pan on your heat pump or air conditioner to see whether it’s full. This will trip the safety switch as a precaution.

Step 2. Check to see whether electricity to your unit and thermostat has been restored after emptying the pan. If not, you’ll need to hire a pro.

Method #6. Check Thermostat Functionality

One of the signs of a faulty thermostat is when the backlight stops functioning.

The old thermostat causes inadvertent operations, such as when the backlight fails and the screen turns blank, or when the cooling system or heating unit malfunctions.

Even with replacement batteries and checked wires, the screen will not turn on.

When working properly, Honeywell thermostats, on the other hand, do not experience such issues and create a safe and secure environment in your home.

Note: These issues can also occur if your thermostat is older. Honeywell thermostats typically have a long lifespan of 10 to 20 years.

Method #7. Reset Factory Default Settings

Another reason your Honeywell thermostat backlight not working could be that it needs to be reset.

Follow these procedures to return your Honeywell thermometer to factory default settings (this may vary depending on your device):

1. Check to see if the device is turned on (it should be on).
2. Press and hold the menu button for 5 seconds.
3. Now move your cursor to the left and stop when you see the word ‘Reset.’
4. On Factory, select ‘Select.‘
5. ‘Are you sure?’ will show as a message.
6. On the prompt, select Yes.
7. Your device will be successfully reset.

Read Next: Why Honeywell Says Low Batteries with New Batteries?

Bottom Line:

We hope that the preceding methods and processes have assisted you in resolving the Honeywell wifi thermostat backlight not working issue and that you now have a better understanding of why this problem happened.

There can be a few reasons why the lighting of your Honeywell thermostat backlight stopped working. The main cause for this is that your thermostat’s batteries are dead and need to be replaced, and the thermostat’s door may need to be tightened properly.

We’ve gone through numerous possible ways to fix a Honeywell thermostat screen that isn’t responding in this article.

Following these should assist you in resolving this troublesome problem. If it has not, please do reach out to the Honeywell’s support team for further assistance and guidance.