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My Outdoor Unit Will Not Come On

This is not an unusual problem whether it is an air conditioner or heat pump. Unfortunately, many times the service technician finds a simple solution that the homeowner could have easily corrected and saved both the cost of a service call plus the inconvenience.

Below is a list of possible causes. Items in blue can be addressed or fixed by the homeowner. Those in red usually require a service call.

  • Thermostat not set properly

  • Emergency switch or shut-off switch turned off

  • Blown fuse in panel

  • Circuit breaker tripped or off

  • Outdoor disconnect turned off

  • Off on outdoor reset button

  • Unit locked out (reset by turning off then turning back on)

Here is a checklist to go through before making a service call:

  • Make sure the thermostat is calling for heating/cooling

  • Make sure no Emergency switches are turned off

  • Make sure circuit breakers for both indoor and outdoor units are in the on position (reset for certainty)

  • Make sure the outdoor disconnect is on

  • Defective thermostat

  • Defective contactor

  • Defective time-relay control

  • Defective thermostat cable

  • Off, on safety device (low pressure, high pressure, low temp, high temp.)

  • Defective control module

Hope this has been of some assistance, however they are just rough guidelines and not all possible conditions are covered.


The company You Choose To Install and Service Your System Will Determine The Degree of Comfort and Satisfaction You Enjoy.

Excerpts of the preceding information have been compiled by Hannabery HVAC, which has graciously permitted us to include them on this web site as a service for all homeowners.

These " Common HVAC Problems " are provided FREE and as a consequence Climatemakers does not assume any liability resulting from any information we provide. In all cases where there is any possibility of injury, consequential damage, direct damage to your equipment or when recommended by the equipment manufacturer, your system should be repaired, inspected or maintained by a qualified technician.

Got a question? Need more information? Have a constructive comment? Click here.

If you find an error on this page I would appreciate it if you would email us or call (757) 600-0422.

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