Bad contactor

by JP
(Mesquite, TX)

Thanks for this awesome troubleshooting guide!

I was able to verify that there was no voltage going to the motor, which led me back to the contactor.

I bypassed the thermostat, temporarily, to see if I could get the contactor to turn the blower on, but no luck.

I took out the contactor, and noticed that moving or shaking it produced a metallic clanking sound, as if a quarter was loose in there! That's a sure sign of a busted spring, or the relay arm may have come loose.

New contactor, $32 and 1 hour later, back up and running.

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