One of the first and most common places to check for a blank thermostat is the auxiliary pan located under the indoor unit. Water in this pan will usually cause this pans switch to open the circuit for the thermostat and systems low voltage. Check out the comments with the question “Why is there water in the pan under my indoor unit?”

Depending on what thermostat you have, the batteries could be bad. Check the breaker for the indoor unit. There could be a problem with the thermostat wiring. Clear Comfort can quickly evaluate the cause of this problem, offer affordable solutions and never try to force you into a new unit.