Common problems and issues for a non-functioning heating or cooling system:
- Use the system selector switch to choose the appropriate “heat” or “cool” position.
- Set the thermostat at least 3 degrees above or below the current room temperature to see if the system will turn on.
- Replace thermostat batteries and check that the display shows.
- Switch the furnace fan to ON, if applicable. If you cannot hear the fan start, check a supply register for air movement. If the fan is not running, there may be no power to the furnace.
- Check to see if there is power to the furnace.
- Locate the emergency shut-off switch/s (this looks like a light switch) if your system and/or home has them. Turn the switch ON.” If the switch is ON, but the fan still doesn’t operate, proceed to the electrical panel.
- Check the furnace door is properly in place and all access doors are properly secured and fitted. Some heating systems have an emergency cut-out switch that activates when a door or service panel is removed.
- Locate the breaker or fuses in the main electrical panel for the furnace and/or air conditioner. Reset breakers.
- WARNING: If a breaker keeps tripping, you should contact a qualified service technician to inspect your system and diagnose the underlying issue.
Air Filter Check
- Check the air filter. Clean or replace a dirty filter.