Ac problem- inside fan shuts of outside unit keeps running

Discussion in 'HVAC' started by Rcfetterman, Aug 26, 2013.

  1. Aug 26, 2013 #1

    Rcfetterman

    Rcfetterman

    Rcfetterman

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    Ac problem- inside fan shuts of outside unit keeps running
    Outside unit keeps running and frost develops on pipes
    Cooling stops
    When thermostat is shut off manually and pipes allowed to thaw then restarted
    Runs fine until it hits temp inside then freezes again
    Happens more at night
    Was thinking dirty contactor but open to suggestion
    Haven't tried to fix yet
    Help!
     
  2. Aug 26, 2013 #2

    woodchuck

    woodchuck

    woodchuck

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    Low freon. Leak in the system.
     
  3. Aug 26, 2013 #3

    kok328

    kok328

    kok328

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    Can you make this happen? If so, watch the compressor/fan contactor when the inside unit shuts off and see if the contactor is disengaging. If not, then check contactor coil voltage. If no voltage when this happens then replace the contactor. The icing up may be from the compressor continuing to run without the blower running to keep the unit from freezing up. Does the blower fan turn off before t-stat temp is reached? If so the problem could be with the air handler and not the compressor.
    You'll have to run the system and check the symptoms to isolate the problem.
     
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  4. Aug 29, 2013 #4

    Rcfetterman

    Rcfetterman

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    Thanks for both replies not the freon had that checked
    Can't make it happen and thermostat always reaches temp sometimes exceeds it
    Walked into 60 degrees when it was set on 72 the other day
    Sounds like cofactors

    Again many thanks
     
  5. Aug 29, 2013 #5

    Rcfetterman

    Rcfetterman

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    Make that contactor
     
  6. Aug 29, 2013 #6

    kok328

    kok328

    kok328

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    To replace the contactor is just guessing at the problem and throwing money at it until the problems is corrected.
    More troubleshooting and inspection is in order.
    However, for around $20 you can replace the contactor and see what happens.
    Make sure to get a 30A, DPST contactor.
     

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