HVAC (Heating/Cooling)
Thermostat screen blank, unresponsive, or not matching the actual room temperature
Likely cause, what to safely try first, and whether it gets worse if you wait.
Likely cause
Dead batteries, a tripped low-voltage breaker/fuse at the furnace, or a miscalibrated sensor.
What to try first
- Replace the thermostat batteries (if battery-powered) before assuming the whole system has failed.
- Check for a small breaker or fuse on the furnace/air handler control board, separate from the main HVAC breaker.
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