Question about Carrier 38CKC036 Air Conditioner

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Air conditioner compressor will not shut off.

When desired temperature is reached furnace blower will shut off but compressor will not shut off. only way i can shut it off is with curcit breaker. whats the problem?

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  • Brian Niten May 26, 2010

    Does the outside fan continue to run as well?

  • oldrrman May 27, 2010

    yes outside fan continues to run.

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  • Master
  • 674 Answers

Remove the cover on the outside unit that covers the circuit board and contactor and capacitor. Then start the unit and set the thermostat so that the unit cuts off. Then go back to the outside unit and see if the contactor is still pulled in and the unit is running. Next open the breaker and see if the contactor drops out. If it doesn't your contactor could be stuck. Try to free it or replace it. If not the problem could be in the circuit board.

Posted on May 29, 2010

Testimonial: "contacter was welded shut. replaced contacter.working good now."

  • Brian Niten May 29, 2010

    You can also use a voltmeter to check for 24VAC coming from the thermostat to the outside unit on the yellow wire. If you have that when the thermostat has been satisfied and cut the a/c off then your thermostat could be shot. There will be 24VAC on the red wire. Check the yellow wire to ground for 24 vac.

  • Brian Niten May 30, 2010

    Does rrman stand for railroad man? My 12 year son is crazy about trains.

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