Why does my thermostat screen keep going blank?
A blank thermostat screen can be caused by fried internal wiring, such as a damaged W1 connection, even after trying new batteries and resetting the circuit breaker. Because diagnosing these electrical issues often requires specialized tools like a voltmeter, homeowners are left unable to troubleshoot the failure on their own when the unit intermittently shuts off.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
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Why does my thermostat screen keep going blank?
- 1Replacing thermostat batteries2 people mentionedDid this help you?
- 2Checking condensate drain lines and float switchesDid this help you?
- 3Calling an HVAC technician for professional diagnosisDid this help you?
- 4Flipping breakers and system switches off and onDid this help you?
- 5Inspecting internal wiring and control board terminals for visible damageDid this help you?
- 6Jumping wires with pliers to test system responseDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I noticed last night that my thermostat was blank.”source ↗
“I did some trouble shooting such as replacing the batteries. Flipping the breaker off for 10 seconds then back on.”source ↗
“When opening the bottom part of the unit, I noticed that my W1 wire and connection seem to be fried.”source ↗
“My thermostat has been intermittently shutting off and going completely blank, then coming back on its own later with no changes on my end.”source ↗
“I don’t have a voltmeter to check, gonna have a buddy come check it out”source ↗
Where this came up
People with this problem also raised
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- 5Why does my thermostat keep losing power and resetting?
- 4Engine temp gauge not working and fans running on max
- 4Thermostat doesn't work after opening it up
- 2Why does my thermostat display say FAn in the top corner?