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I got an indoor unit working on fan mode only...the compressor on the outdoor unit is not kicking in...even though there is power to it..iv checked the fuses on the pc board outdoors...any suggestions anyone?

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  • nortbona Jul 21, 2008

    that makes sense...i put a uni-tester on the compressor terminals individually to earth and i got 24 volts...it seems to me that its pointing to a faulty compressor at the moment dont you think...but to test that i need to check for the 230 volts i presume..im probably sounding a bit vague arent i?

  • nortbona Jul 22, 2008

    nope i pulled the black casing off the top of the compressor and tested the 3 terminals there seperately to an earth..and got 24v lighting up on my unitester(which is probably not the most accurate tool in the book)initially i thought the problem was because the coils were filthy on the outdoor unit...but having cleaned them the compressor still wouldnt start...so unless theres some massive time delay going on...im thinking i should be testin the compressor reading ohms?????...thanks for your help

  • Tyrone Keys May 11, 2010

    What type of unit is it? Heat pump or other. How old is it? If you may share the following info I may be able to help you. The make, model and serial numbers of the indoor and outdoor units; and the make, and model number of the thermostat, You may by this time found the answer to you question.

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There are two different power voltages to these outdoor units. 24 volts in the control circuit and 230-240 volts for the compressor to operate. Checking the fuses as good does not insure that power is to the unit. You need to check the power with a volt meter.

Posted on Jul 21, 2008

  • James Helmer
    James Helmer Jul 21, 2008

    There should be no reading to ground from the compressor terminals. Lets make sure we are on the same page here. Compressor is the heart of the machine so to speak. The contactor closes and supplies the high voltage to the compressor. Are you speaking of the contactor or what?

  • James Helmer
    James Helmer Jul 22, 2008

    To test the compressor for ground you must remove the wires from the terminals. Then check for Ohm's to ground. If your system has a solid state board in the compressor control panel you may well have a time delay built into it which is designed to prevent short cycling of the compressor. These delays are normally timed to 5 minutes.

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Understanding Air Conditioner Electrical problems is not as hard as you can make...


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