You’ve just found the ultimate Honeywell thermostat troubleshooting no display guide!
If the display on your Honeywell thermostat doesn’t seem to be working or turning on at all, the issue could be caused due to not fully closing the furnace door.
Moreover, problems with the thermostat’ screen could be caused by battery or charge problems.
To fix a non-working display on the Honeywell thermostat, first power cycle the device and reinsert the batteries. Make sure that the furnace door is closed all the way and replace the thermostat’s batteries. Lastly, perform a factory reset to solve the issue.
The possible causes for issues with the display of your Honeywell thermostat are related to the device itself and your HVAC system.
In this guide we’re targeting both instances, to identify where the problem is coming from and solve it as soon as possible.
Here are ALL possibilities that could be impacting your thermostat screen:
1. Power Bug/Glitch
Like all devices, your thermostat’s power might have fluctuated, causing the device’s screen to shut down completely.
2. Worn-Out Batteries
If the batteries of your Honeywell thermostat have gone faulty, the display of your device will become black as well.
3. Furnace Door Problem
If the furnace door was not closed all the way in or there is an obstruction preventing full closure, the screen will not light up.
4. Thermostat Panel Problem
If you’ve closed the panel of your Honeywell thermostat incorrectly, no charge will reach the device, therefore the screen won’t work.
5. Hardware Problem
Lastly, your Honeywell thermostat could have come to an end-life and needs to be either repaired or replaced entirely.
We will put aside the possibility of a hardware failure, and proceed with tackling all possibilities, to identify and solve the problem
To solve the display problem with your Honeywell thermostat, you must first determine whether the problem is coming from the HVAC system or the device itself.
That’s not an easy thing to determine, so our causes are designed in such a way that you can troubleshoot both of the instances and come up with the best solution for the problem.
Here’s how to fix the blank display on your Honeywell thermostat in easy solutions:
You should first attempt to solve the problem by performing a soft reset on your Honeywell thermostat.
The process works by ejecting the batteries from the device for a certain amount of time and inserting them back into the compartment.
Here’s how to perform a soft reset on your Honeywell device in easy steps:
- Go over to your Honeywell thermostat and locate the front panel.
- Pull the component towards you, until the panel comes off.
- Expose the batteries and eject both of them.
- Standby for 60 seconds and re-insert the batteries into the compartment.
- Put the compartment back into position and test your thermostat.
Alert: Make sure to insert the batteries correctly, otherwise you’ll accidentally perform a reset, which might not be necessary yet.
Your Honeywell thermostat screen is going to be blank if you haven’t closed the HVAC system’s furnace doors fully.
In that regard, the next thing you should do is make sure that you’ve closed the doors entirely to get your Honeywell thermostat working again.
Since we don’t know where exactly your HVAC system furnace is located, you will need to go there and ensure you’ve closed the door entirely.
In case it appears that the door is closed, make sure to open it and then, close the door again.
Note: In case the door closure is being obstructed or the entirety of it is broken and not closing, you would need a repair.
If there wasn’t an issue with the furnace door of your system, you should attempt flipping the safety switch to solve the blank screen problem on your Honeywell thermostat.
Each and every HVAC system has its safety switch for individual components of the system and you can find it in the cooling pipe going into your furnace.
The safety switch looks like a pipe with three exits and a cable going through it.
To disable the safety switch, you will want to undo the screw component that practically closes the pipe.
This will cause the system to continue working, thus, activating your thermostat.
Note: When the switch is closed, your system will become inactive along with your thermostat.
You must open the safety screw inside of the switch for the system to start working again.
Your Honeywell thermostat consists of several wires. If any of the given connections are faulty, the cable might need replacement and for the time being your thermostat won’t be working.
In that regard, the next thing you should do is reconnect all thermostat wires.
Here’s what to do in regard to your Honeywell thermostat’s wires:
- Take out the front panel of the device by pulling it towards you.
- Unscrew the stand of the thermostat from the wall.
- Examine all cables and look for the wire that connects to the R terminal (the wire is in red color).
- Look for another wire that connects to the C terminal that makes the display respond (it should be in blue color).
If either of the red or blue wires are damaged or are disconnected, plug them into the respective R or C-terminal.
The terminals are on the back of your thermostat stand and have a little slot in them for the respective cable.
Pro Tip: In case everything looks fine, and both of the wires are connected and not damaged, attempt to solve the problem by reconnecting them.
In case the screen of your Honeywell thermostat is still not working, the next thing you should do is replace your thermostat’s batteries.
Here’s how to replace your thermostat’s batteries:
- Take out the front panel of the device.
- Expose the batteries and eject them.
- Insert a pair of fresh AA batteries into the compartment.
- Reinstall the front panel cover.
Now when having proven to work batteries, it’s time to reset the Honeywell thermostat as a last resort against the non-working display problem.
Since a factory reset is related to the Honeywell thermostat’s batteries, you should reset the device to see if that will help.
To factory reset your thermostat put the batteries on the incorrect side (positive with positive and negative with negative) for 30 seconds.
Once you’re done, put them in the correct way and test.
Thus, to fix the blank display on your Honeywell thermostat, soft reset the device and reconnect all wires. Disable the safety switch and close the furnace door. Lastly, replace the thermostat’s batteries and perform a factory reset.
This was the complete guide for Honeywell thermostat troubleshooting no display.
If you still have any unanswered questions or you couldn’t solve the problem, consider reaching out to Honeywell for additional assistance!