Upon arrival the thermostat was turned off At initial test run everything ran normal with no complications or hesitations. Air filter was replaced one week ago and is still in like new condition, thermostat turned on and cycled both low and high stages with no overheating. Combustion air filter clean, inspect and resurface flame sensor. System is running on thermostat heat mode. Unsure of the daily schedule or home and away settings but the system is functioning correctly. Corinthian builder staff suspects homeowner turned thermostat off yesterday but forgot to turn back on