Air Conditioning & Heating Troubleshooting
Review basic thermostat, filter, and register checks for air conditioners, gas furnaces, and heat pumps.
Before requesting HVAC repair, check the thermostat settings and airflow. These simple observations may help clarify the problem. Choose the guide for an air conditioner that will not cool, a gas furnace that will not heat, or a heat pump that will not heat or cool.
Troubleshooting guides
These guides cover only basic thermostat, airflow, and filter checks. Fan settings vary: ON runs the blower continuously, while AUTO generally runs it when the system calls for heating or cooling. Do not open HVAC equipment, operate electrical disconnects, or handle gas controls or ignition components. If the checks do not resolve the issue, contact a qualified technician.