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    cycling man's Avatar
    cycling man Posts: 3, Reputation: 1
    New Member
    		  
    #1

    May 5, 2008, 04:59 AM
    Cycling and relays
    WHen the temp goes below 35 outside the carrier heat pump cycles every minute. Is this caused by the thermostat or is there a relay to prevent the defrost from cycling at cold temps?
    aldematt57's Avatar
    aldematt57 Posts: 18, Reputation: 2
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    #2

    May 5, 2008, 07:00 AM
    Regardless of what type of control you have the compressor should not be attempting a start every minute.
    If you're running your heat pump in temps below 40 degrees, there will be more frequent defrost cycles but certainly not every minute.

    I'd have a tech diagnose the sequence of operation because you are describing a problem that needs a competent tech.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    May 5, 2008, 09:31 AM
    I agree with aldematt57. The timmer board or sensor is probably defective if it is going into defrost that soon. It could also be the pressure switch and a few other different parts that is why alsematt57 said you need a professional to look over your system and make a proper diagnosis other wise you will spend big $$ just replacing all the parts till you find the defective one.
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