What should I do if my heating or cooling system is not responding to the thermostat?

First, press the SYSTEM button to confirm the correct mode is selected — for heating, ensure the set temperature is higher than the indoor temperature, and for cooling, ensure it is lower. Also check that the circuit breaker is on, the power switch at the system is on, and the furnace door is closed securely. After checking these items, wait up to 5 minutes for the system to respond. (Page 12)