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My Outdoor Unit Will Not Shut Off

It only happens occasionally. Thermostat satisfied; indoor blower goes off; outdoor unit continues to run and can only be turned off with circuit breaker.

Only 2 or 3 things can cause this. The most common is a stuck compressor contactor. Located in the outside unit, the contacts get pitted and eventually weld shut. This can cause serious damage. Some authorities think it is good practice to replace the contactor every few years just like you would replace the spark plugs in an automobile. Other causes would be a shorted thermostat cable or a defective thermostat.

Below is a list of possible causes and usually require a service technician to correct:

  • Stuck contactor

  • Defective thermostat

  • Thermostat cable shorted

Hopefully, this has been of some assistance, however they are just rough guidelines and not all possible conditions are covered. Get advice on AC repair from one of our trained and licensed techs to be sure you are on the right track.


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.

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