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  1. #1
    Join Date
    May 2005
    Location
    South
    Posts
    580

    Problem with a Rheem, bet you can't figure it out

    but I hope someone can.

    It's a Rheem RHPN-HM2421JC A/H with electric heat, installed vertical in a closet.
    The cond unit is a RARL-024JEZ two stage.
    Thermostat is a Rheem TST305.
    T-Stat is configured for two stage cooling, and no daily program.

    The customer says it runs fine all day but stops cooling somewhere between 2am and 5am. He says he looks out the window and can see the cond fan running and hears the compressor, and reach his hand to a grille nearby and it's blowing warm air.

    Then around 6am it's cooling fine again. It happens every night.
    There is no power company call box that would shut it off.

    I have checked everything, I won't even bother to list it all because of the specific time that it blows warm air. It obviously works when I'm there.

    We can have a 95 degree day and it works fine all day, but had this problem the night before and the next night.

    The board in the cond unit reads no codes.

    The guy is in his 80's or close to it I would guess.

    What do you think?

  2. #2
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    Txv for a metering device? If so there's not much else that could have the compressor and fan operating without cooling,not intermittently at least.

  3. #3
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    155
    Condensing unit on the west side of the home and in the sun in these hours? Could be thermal in nature and compounded by an overcharge. Either that or something is parking on the fan grille every afternoon about that time of the day. Some critters have strange behaviors. Ants in contactors, never have figured out that attraction....

  4. #4
    Join Date
    May 2005
    Location
    South
    Posts
    580
    Quote Originally Posted by Juan Madera View Post
    Condensing unit on the west side of the home and in the sun in these hours? ....
    Well no, here in FL the sun isn't out between 2am and 5am

    How could it be anything mechanical when it fights 95 degree heat fine but blows warm between 2am and 5am?

  5. #5
    Join Date
    Nov 2009
    Location
    Northwest Illinois
    Posts
    277
    I think the electric heat is kicking on some how and that would explain the warm air. Maybe the stat is messed up causing that problem.

  6. #6
    Join Date
    Aug 2008
    Location
    Bel Air MD
    Posts
    35
    Could you try unhooking the electric heat just to eliminate that as a possibility?

  7. #7
    Join Date
    Jun 2012
    Location
    Texas Hill Country
    Posts
    53
    Sounds like an old man with blood circulation problems.

  8. #8
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    155
    oops.... missed the AM part. Was thinking PM...

  9. #9
    Join Date
    Jun 2012
    Location
    East tx
    Posts
    164
    I was also thinking a wiring issue with heat on...possibly the tsat set for heat pump accidentally? Or there is a crossed wire? Or even a relay or sequencer that's getting a signal..if he is telling the truth and not imagining the condenser running...maybe the stat is satisfied and fan in circulate mode.

  10. #10
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    Quote Originally Posted by HPpro View Post
    Could you try unhooking the electric heat just to eliminate that as a possibility?
    Unhooked the w2 from condensor board to eliminate that as a possibility.

    And see if Rev valve is energizing or if its just strips

  11. #11
    Join Date
    Oct 2007
    Location
    Hallandale Beach, FL.
    Posts
    437
    Could it be moisture in the system freezing in the txv?

    At what temp does he set the stat at night?
    I miss you mom and dad.

  12. #12
    Join Date
    Apr 2012
    Posts
    44
    How much heat gain does this place have that he notices it not cooling for couple hours in middle of night.

  13. #13
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,918
    Quote Originally Posted by SBKold View Post
    Unhooked the w2 from condensor board to eliminate that as a possibility.

    And see if Rev valve is energizing or if its just strips
    I was thinking rev valve as well.

    Possibly hanging up intermittently

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