When you discover that your wall thermostat display is completely blank, you should follow a systematic troubleshooting process to restore power. First, if your thermostat uses removable batteries, open the compartment and replace them with fresh alkaline batteries. Second, if the unit is hardwired, go to your main electrical panel and verify that the HVAC circuit breaker hasn't tripped. Third, turn off power at the breaker, remove your indoor furnace service panel, and inspect the control board for a blown low-voltage 3-amp or 5-amp fuse, replacing it if the internal wire is broken. Fourth, remove the thermostat faceplate and ensure all low-voltage wires are securely fastened to their terminal blocks. You can verify that your troubleshooting was successful when the thermostat screen powers back on.
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