CONTACTOR
The contactor is the part of the air conditioner that controls the flow of electricity into the unit. When you turn off your AC, the contactor goes up, blocking power. By the same token, every time you turn on the air conditioner, the contactor is lowered, allowing electricity to power the system. Once your home reaches the temperature set on the thermostat, the contactor goes up again.1. The condenser unit never shuts off
This could be a sign that the contactor has melted, leaving the air conditioner with no means to block electricity.
2. AC hums and won’t turn on
When you turn on the AC, you may hear the air conditioner humming, but it won’t fully power on.
3. AC makes a chattering noise
Another sign is a chattering sound coming from inside the air conditioning unit.
Is Your AC Contactor Failing?
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