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Commonly Reported HVAC Problems:

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Outdoor unit won't come on, Outdoor unit not running:

burnt wires in outdoor unit

This is a very common problem, whether it's an air conditioner or a heat pump. And there are many things that can prevent the outdoor unit from starting, some of which can be quite serious.

Unfortunately, many times a service technician is dispatched only to find a simple problem that could have been addressed, even fixed by the homeowner.

outdoor disconnect box

Below is a list of possible causes. Items in red usually require a service call. Items in blue however can be addressed, some even fixed by the homeowner.


Red = Professional fix | Blue = Homeowner fix

  • Faulty thermostat
  • Faulty contactor or capacitor
  • Faulty time-delay relay
  • Faulty thermostat cable or burnt wires
  • Unit off due to an open safety device (low pressure, low temp, high pressure, high temp...)
  • Faulty control module
  • Thermostat not set properly
  • Emergency or shut-off switch turned off
  • Blown fuse in panel box
  • Circuit breaker tripped or off
  • Outdoor disconnect off
  • Condensate pump unplugged and/or safety switch open
  • Outdoor reset button tripped
  • Unit "locked-out"

And before you place a Service Call...


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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