Question about Carrier 38CKC042 Air Conditioner

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Won't turn on

Our AC unit will not turn on. The green light on the thermostat is on, the electrical panel is fine, the unit makes a clicking sound but then doesn't kick on.

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  • kpodobnik Jul 25, 2008

    It is central air. Not sure what you mean by both halves. The fan runs but just blows room temp air. the unit in our back yard does nothing but an occasional clicking noise. Thanks for any help you can give.

  • sk0685 Mar 28, 2009

    Mine unit makes a humming electrical noise like something will not start up

  • B Carson May 11, 2010

    Is this a central air conditioner? If so, do both halves not start?

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The unit in your back yard is the outside half. The one that blows room temp air is the inside half.

The outside half is not working. No compressor, no fan. That is a problem with the power. You will find the bad parts very close to where the power wires go into the outside half. It might be a bad relay that connects both the fan and compressor to the power. It might be a 3 terminal capacitor. It might be burnt wires.

Posted on Jul 25, 2008

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Posted on Jan 02, 2017

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