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Problem: Why is my Air Conditioner Contactor Going Out So Often?


Problem: Why do I have to replace my air conditioner contactor so often? This happens every couple of weeks. Either my contactor’s contacts are welded closed which keeps the air conditioner running continuously without me being able to turn it off without pulling the high voltage disconnect or the contactor quits working altogether?

Answer: Thanks so much for asking this question!  I have seen many contactors go out prematurely in our HVAC business.  Contactors going out prematurely are usually caused by dirt, moisture, or low voltage. I would like to suggest that you test your coil voltage and make sure that you are keeping a minimum of 24 volts AC to the contactor coil. If you are not getting at least 24 volts AC to the contactor coil then contactor contacts will chatter, vibrate, arc, and burn the contactor out prematurely. If you are not getting at least 24 volts to the contactor then you might have a loose low voltage wire connection, a thermostat that needs new batteries or you might need a new transformer or a transformer with a  higher VA rating. Most transformers are 40 VA. You might want to get a transformer that is more than 40 VA. We have a really good YouTube Video made by #ToolboxTuesday below that describes what causes contactors to fail. Thanks #ToolboxTuesday for making this excellent video!   Please click here if you are interested in a good universal low voltage transformerPlease click here if you are interested in a new contactor. Please email us anytime if you have any questions. Our email address is We would love to help you out and have your business! We hope that this post helps you find out what is causing your contactor to fail so often.  We hope you all have a great and blessed day! 

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