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What are the common signs of a bad AC contactor and how can it be diagnosed and replaced?

Natasha Sporer ∙

Lvl 10

∙ 1mo ago

Updated: 2/19/2025

Common signs of a bad AC contactor include the air conditioner not turning on or off properly, frequent cycling, or a humming noise. To diagnose a bad contactor, visually inspect it for signs of burning or wear, and use a multimeter to test for continuity. If the contactor is faulty, it can be replaced by disconnecting power, removing the old contactor, installing a new one, and reconnecting the wires.

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