Resetting a blank thermostat requires restoring power and rebooting the device's internal software or microprocessors. First, if your thermostat uses removable batteries, open the compartment and replace them with fresh alkaline batteries to revive the display. 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 from the wall mount for a minute and snap it back on to force a hardware reboot. You can verify that your troubleshooting was successful when the thermostat screen powers back on and illuminates successfully.
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