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Commonly Reported HVAC Problems:

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Indoor fan won't shut off unless I use the circuit breaker:

Shutting indoor unit off at the main breaker

So your indoor fan never stops running. You've checked the obvious... The fan switch on the thermostat is in the auto position, not the on position. You tried turning the thermostat to the off position, nothing works. The only way to get that pesky fan to stop running is to shut it off at the breaker or the Emergency Shut-off switch.

Well, if you are going to have a problem with your heating or air conditioning system, this is the one to have!

Although your fan never shuts off, your heating and air conditioning still works fine. And if you have allergies, it's better to have your fan running continuosly to filter more air anyway. And keep in mind, it really doesn't hurt the motor or cost more money, running all the time. And lastly, fixing this problem, usually isn't an expensive repair. But having said that, do not ignore the problem and let it linger, call for service.

So What Causes This?

Usually Only Three Things...

  1. A fan relay that is stuck closed
  2. A shorted thermostat cable
  3. A bad thermostat

That is about all there is to this problem. So if your fan doesn't shut off, don't panic - just schedule a service call and have it repaired.

Below is a list of possible causes. Items in red usually require a service call. The bottom four causes in blue are commonly found problems and can be addressed, even fixed by the homeowner.


Red = Professional fix | Blue = Homeowner fix

  • Stuck fan relay
  • Thermostat cable shorted
  • Bad thermostat

Please keep in mind that the information found on our website is provided free of charge and Hannabery HVAC does not assume any liability resulting from the information we provide. We hope this information helps, but please note that these are just rough guidelines, and not all possible situations are covered. Your HVAC system should be inspected and repaired by a trained technician.

Commonly Reported HVAC Problems

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