What should I do if my thermostat screen is blank or not responding?

If the thermostat screen is blank, check that the circuit breaker or fuse connected to your heating or cooling system is turned on, ensure the power switch on your system is on, and verify that the furnace door is closed securely. Wait 5 minutes after making these changes for the system to respond. If the screen is difficult to read, you can increase the backlight brightness through the menu settings.