Question about Goodman CLQ36AR49 Air Conditioner

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A/C unit won't come on. I have 230 and 24 volts to unit but contractor won't engage. What could problem be?

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  • Expert
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Do not rule out the T-stat wires being loose or broken and not calling for cool!

Posted on Aug 22, 2010

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Check the 24 volt coil on the contactor for continuity between the 2 wires. I suspect the coil is open. If you have 42 volts ac at the base of the contactor and it ain't pulled in then it is shot. I wrote a tip on this and posted a couple of videos here How it works: Central AC Contactor

Posted on Aug 21, 2010

  • Dan Webster
    Dan Webster Aug 21, 2010

    Not 42 volts 24 oops. Actually you should get around 28 vac. Dang I cannot type today. Take the wires off the coil to check the coil sso you won't get a false reading.

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To answer your question, the common wire should be at ground potential. That means zero volts relative to your local ground (cold water pipe or other provision. If you can't trace it, the contractor should be able to. If other circuits are normal, it's in that line which should be off of it's own breaker.

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