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What is an Air Conditioner Contactor and What Can Go Wrong with One?

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Jerry Kelly Technicians Walking Through The Office

Under the hood of an air conditioner, there is a complex system of electrical components that work together to turn your system on and off at the right times. Although it’s not necessary to understand exactly how this electrical system works, there are a few of its components that are useful to know about in the event that something goes wrong. One such component is a contactor. Today we’re going to talk about what an air conditioner contactor is and what can go wrong with your system if it malfunctions!


What is an air conditioner contactor?


A contactor is a device that controls the flow of electricity to your air conditioner. You can think of it like a drawbridge that connects a road over a river. When the drawbridge is down, cars can freely drive over the river. When the drawbridge is up, cars must wait on either side of the bridge until it is lowered back down.


In the same way, a contactor either blocks or allows the flow of electricity to your air conditioner’s condenser, compressor and motors. When your air conditioner is off, the contactors are up and they block electricity from reaching your system’s major components. When your thermostat wants to start a cooling cycle, it sends a small voltage to the contactors that lowers them and connects the flow of electricity to the rest of your air conditioner. Once your thermostat is satisfied, it sends another voltage to the contactors that signals them to lift up again and disconnect the flow of electricity.


What can go wrong with an air conditioner contactor?



Avoid contactor problems with annual tune-ups


The best way to avoid problems with your contactors is to schedule annual tune-ups with Jerry Kelly. During a tune-up, we’ll inspect all of your system’s electrical components, including the contactors. We will clean off any dirt that has built up on the contactors since your last inspection and replace any worn out contactors when necessary.


If you have any questions about an air conditioner contactor, or if you’d like a cooling system serviced or installed in your home, contact Jerry Kelly, your St. Charles, MO, air conditioning contractor. We provide service all over the St. Louis area, including towns like Dardenne Prairie, Des Peres and Frontenac, MO.


photo credit: kf6oak via photopin (license)


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Janet A.
13:00 24 May 22
Aaron K did a great job. Very professional. Thank you Aaron K.
Ron S.
16:56 23 May 22
Heath was very professional and did an excellent job. Highly recommend JK!
Kimberly G.
01:51 22 May 22
I had my ac tuneup for the Dpring. Aaron was very professional and thorough. He did great work.

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