A/C compressor, only works in "heat" mode

Discussion in 'Electrical Systems' started by BWSLATE, Nov 18, 2013.

  1. BWSLATE
    Joined: Nov 2013
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    Location: S TEXAS COAST

    BWSLATE New Member

    Just installed a Marine Air 12K BTU unit. Reverse cycle heat pump type, 110V on my Bertram.
    The compressor kicks on, while heating but doesn't during "cool" air conditioning...
    Any Ideas/suggestions?
    Thanks..
     
  2. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    There usually is a microprocessor with temp sensors both inside and outside.
    Since the unit works while heating, I guess the brain decides the situation isn't suitable for cooling because the outside temp is too low.
     
  3. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Check functionality of the reversing valve and low pressure switch.
     
  4. Black pearl
    Joined: Oct 2014
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    Black pearl Junior Member

    Is it a normal split type unit? Can you post a pic maybe,just want to get an idea of what type of A/C it is
     
  5. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    Remote tstat incorrectly wired or faulty tstat or faulty wiring? Check all the little DIP switch settings on the Tstat. Check to see if the reversing valve is reversing. Try wirenutting the tstat wires to test the Cool without the tstat. How many tstat wires? What colors?
     

  6. Black pearl
    Joined: Oct 2014
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    Location: South africa

    Black pearl Junior Member

    Also sounds like interconnecting wiring might be wrong,is it a new unit?
     
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