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  1. #1

    rheem heat pump frozen

    i have the heat pump with demand defrost running in steady light rain, wet, working fine at 32 to 34F degree outside, good heat to keep indoor 71F, heard compressor each cycle about 15 to 20 minutes long, ran twice per hour, and then overnight into morining, still more light rain, temperature slowly raised to about 35F or 37F outside, and heard compressor running non-stop, like 50 minutes long. went outside, and saw there was a good amout of frost on outdoor fins and looks like not defrosting.

    did the demand defrost control just terminate defrosting when outdoor temperature is greater 35F? or just a bad combination of running heat pump in light freezing rain at 35F, where demand defrost not able to hand it either.

    is there a manual defrost on demand defrost system?
    turn off thermostat and run garden hose to rinse the frost on coil fin?
    or put on coat and run AC for a few mintues?
    thanks

  2. #2
    Join Date
    Sep 2012
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    Missouri
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    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary, or ask questions of the OP here.

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    Last edited by beenthere; 02-25-2013 at 06:57 PM. Reason: Non Pro * Member

  3. #3
    Join Date
    Jan 2005
    Location
    Emerald Coast
    Posts
    965
    .

    It got behind. Freezing drizzle (precipitation) is not welcome on a heatpump.

    Switch to backup heat till the drizzle / ice is over with. It can't keep up.
    ..
    Do not attempt vast projects with
    half vast experience and ideas.
    ...

  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,608
    There is a manual (test). Only problem with switching to cooling is the fan keeps running pulling cold air over the coil. Won't defrost much that way.

    Demand boards do let the coil get very frosty before going into defrost.

  5. #5
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,855
    Don't panic yet. Frost is one thing, frozen solid is another. Let it do it's thing.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  6. #6
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    JES, this is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary or ask questions of the OP here.

    You can find the rules for posting and qualifications here.

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  7. #7
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    There may be an way to make it defrost longer if in fact it is functioning properly.

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