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Is your Honeywell thermostat showing you a blank screen? The reasons range from trivial to relatively complicated. It is best to run through our troubleshooting guide before calling for professional help or replacing your thermostat. Check out some solutions below!

At SmartHomePerfected we always advise readers not to undertake any work they are not competent in performing and if in any doubt, it is best to seek the assistance of a professional.

1. Check the power

Most thermostats are connected directly to your house’s power source. If that’s your case, too, there may be a problem with the power source in your house. 

First, check the circuit breaker. If all is right there, have a look at the lights on your HVAC system.

It is also possible that the power to the particular line on which your thermostat is connected is cut off. Be sure to check all switches and fuses.

2. Check the safety switch

If there is nothing wrong with the power in your house, check the safety switch in your HVAC system. HVAC systems usually have safety switches on different individual components of the system. 

You will also find some switches on splitters and controllers. Check to see if any of them have been tripped. If that’s what’s causing the thermostat to not work, it’s an easy fix! All you have to do is put the switches back in position.

3. Check the batteries

One of the most common causes of issues with thermostats is the battery running out or being faulty. Honeywell thermostats are no exception. Faulty batteries could be causing your thermostat’s screen to go blank and unresponsive. You can usually tell that the batteries are the root cause of the problem if the screen is flickering, fading, or turned off completely. 

Most thermostats are powered by the HVAC system, but they still have batteries in case of a power outage. Perhaps your thermostat is entirely battery-operated. In that case, the thermostat relies on batteries only and it won’t work if the batteries are faulty.

4. Check furnace doors

Most regular furnaces in North America will have a door switch. Check if yours has one because thermostats could be sensitive to that and even stop working if there is a problem. In order for your Honeywell thermostat to work properly, the doors should be closed and the sensors should be turned on. Check to see that everything is working. 

5. Check if the thermostat panel is pressed in

The problem can be with the body of the thermostat itself. Unless the panel is pressed in perfectly, the screen will not turn on. Check to see if everything is alright in that sense and press the panel in if necessary. For most Honeywell thermostats, you can tell when the panel is in place and when it makes a clicking sound.

6. Check for loose connections

The whole HVAC system consists of a bunch of wires and a thermostat. In order for it to work well (or at all), all the wires need to be intact and connected in the right places. 

Any loose connections may cause fallout in the work of the thermostat. Check to see if the wiring is loose on any of the HVAC components, such as the boiler, heater, AC, and so on. Also, check if the wires are all properly connected to the terminals at the back of the thermostat. 

Make sure to turn the circuit breaker off before you get to the wires. Handle this issue safely!

7. Check the wiring

While we’re on the topic of wiring, you could check to see that all the wires are connected correctly and in the right places in the thermostat. Unscrew your thermostat from the wall and have a look at the wires. Check to see if there is a wire that’s connected to the R terminal; it should be red. Does your thermostat need a C-wire? Check! If there isn’t one connected to the C terminal, that might be the problem behind the blank screen. 

Checking the wiring on a thermostat shouldn’t be too difficult, though you might want to ask someone more experienced for help. 

8. The thermostat might need to be replaced

Finally, if nothing has worked, your thermostat might just need to be replaced! Remember how long ago you first purchased it. Has it ever had any problems before this? Maybe your thermostat has served its purpose in your home and should now be replaced by a newer model. Or maybe you just need to contact Honeywell to get some more specific advice. Alternatively, you can call a local handyman and ask for help.

The Honeywell Thermostat Blank Screen Conclusion

Hopefully, at least one of these tips has been helpful! If not, perhaps it’s time to seek professional help. Reach out to Honeywell to get some advice or call an electrician who is able to identify the problem at a quick glance. 


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