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Troubleshooting Air Conditioners.

SYMPTOM CHECKER

Before you call for service, try some simple air conditioning troubleshooting that may fix your problem.
 
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System isn’t working? No matter what the problem, we’re here to help. Before you call for service, try these simple tips for troubleshooting air conditioners.

Check These First

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Is it getting power?

  • Check your fuses or circuit breakers to make sure they don’t need to be reset
  • Remember, if your home’s power is out or disconnected, your system may not work
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Is the thermostat set correctly?

  • Make sure your thermostat has power
  • Check that your thermostat is set to a cooling or heating mode and not set to “off”
  • Make sure the thermostat is set to the right setting and temperature
Symptom What to Do
No Heat/Insufficient Heat
  • Do you have a new or newly remodeled home? Was any work done on your fuel or electricity lines recently? Check to see if your gas or electricity has been turned off. If this is the case, having it turned back on may solve the problem.
  • Check to see if your thermostat is on, and what temperature it's set at. If your thermostat is turned off or set incorrectly, turn on and/or reset thermostat.
  • Check your home's circuits and fuse box. If you have an open circuit breaker or burned-out fuse, switch on the circuit or replace the fuse.
  • Remove any snow drifts resting against your outdoor unit.
Symptom What to Do
No cooling/Insufficient cooling
  • Check the doors and windows in your home. Close any open doors or windows as cool air may be escaping through them.
  • Check to see if your thermostat is on, and what temperature it's set at. If your thermostat is turned off or set incorrectly, turn it on and/or reset thermostat.
  • Check your home's circuits and fuse box. If you have an open circuit breaker or burned-out fuse, switch on the circuit or replace the fuse.
Symptom What to Do
No airflow
  • Check around your outdoor unit. If there are any leaves, hedges or property walls butting up against it, your system may have frozen up due to a dirty coil. Make sure your outdoor unit has 1' of clearance all around it.
  • Check the filters in each of your system components (where applicable). If any of your filters are dirty, consult your manual to clean or replace it. Or call your dealer to do this for you.
  • Check to see if there is any air coming through your vent. Your indoor blower may not be operating. If this is the case, you should contact your dealer.
Symptom What to Do
Stale and stuffy air
  • If you have a whole-home air cleaner or air exchanger, make sure it is switched on and its filter is clean. For even more tips on improving your indoor air quality, click here.
Symptom What to Do
Too dry or too much moisture in the air
  • Check to make sure your humidifier is switched on. Many times, homeowners turn off the humidifier at the end of the previous heating season and forget to turn it back on when needed.
  • Make sure your humidifier’s damper or water valve is open. If it’s closed, consult your manual to open or unclog.
  • Check your humidifier setting and adjust the indoor relative humidity settings to bring greater comfort to your home.
Symptom What to Do
Noisy air vents
  • A high pitched sound often, although not always, indicates a lack of return air. Make sure your return and supply vents are open and free of any blockages including furniture.
  • Other noises (e.g., rattling, humming, thumping or scraping sounds) could be a sign of undersized or flimsy duct work, clogged filter or wear and tear on your system’s internal components. If you hear an unusual sound, call your local dealer for service.
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Is it Fixed? If not, choose a tab above to check more symptoms or find a dealer near you .

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