Air Conditioner & Furnace Troubleshooting Tips

Check these common air conditioner and furnace issues and problems before calling a Licensed Service Specialist. If you are uncomfortable performing any of these tasks or if the problem persists, call Arlinghaus Heating & Air to schedule your knowledgeable hassle-free repair.

Common problems and issues for a non-functioning heating or cooling system:

Thermostat Check

  • 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.

Electrical Check

  • 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.

Electrical Panel

  • 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.

If your system is still not working, please give us a call.