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  1. #1

    Outdoor Heat Pump Runs after inside unit turns off

    Hi All,

    Heat Pump -
    Outdoor Rudd ~13 yrs
    Indoor Rheem ~2 yrs

    I noticed a few weeks ago that my indoor coils were icing up/frosting over. I called a tech who noticed that I had too many vents closed and also cleaned my outdoor coils. I also replaced with a new filter. My house both before and after would cool very well except when frosted. I also informed the tech that it seemed like there was still liquid flowing when the inside unit was off. He responded that this may just be normal cycling. This only seemed to happen when the indoor coils were frosted. Tech also checked all contacts and temps and said the unit is in perfect working order. Fast forward a week and no real change. Tech returned with no idea of the problem and decided to try increasing the speed of the indoor blower. This worked fine for a few days. Fast forward a week and then I noticed that the outdoor unit would not turn off and the only way I could get it off was to use the breaker. Tech came and fixed the contactor which was burnt. Unfortunately this still didn't fix the original problem but got it working again. As this story continues I've been paying more attention and I have noticed that there are times when the thermostat will click on and both the indoor and outdoor unit turn on and blow nice cold air. The indoor unit will turn off/stop blowing when the temperature is reached but the outside unit continues to run and will eventually turn off. I timed it once and it was about 45 minutes. The outdoor unit will turn off if I use the thermostat. The two units sometimes work in sync and sometimes the outdoor unit stays on. This then leads to the indoor coils frosting up.

    I've searched online with no ideas and am reluctant to call the same company back but would hate to call another person if this is truly not a hard problem to solve. Welcome any thoughts or ideas. I'm handy and can use a voltmeter if needed. Other info that may or may not be of interest I purchased and installed a new programmable thermostat about a year ago.

    Thanks!

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,084
    Model # of heat pump and air handler?

  3. #3
    Join Date
    Apr 2010
    Location
    Minnesota
    Posts
    517
    Your tech needs to focus on the indoor blower motor and low voltage wire connections .

  4. #4
    Rudd upka-030jaz
    Carrier fb4cnf030

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,084
    The big question to ask the installer, how does he know the right size piston for the Ruud heat pump is installed in the Carrier air handler? I'd think the best solution with this mismatched setup of efficiency and brand is having an R22 expansion valve installed.

  6. #6
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,338
    Did the problem start when new stat was installed?

  7. #7
    Join Date
    Aug 2004
    Location
    Missouri
    Posts
    15
    I am in agreement with socotech, I would be looking at the reason why there is low voltage to the contacter. You need to tell the technician about the condensing unit running after the indoor unit has shut off, so they can focus on the low voltage connections.

  8. #8
    Join Date
    Jul 2005
    Posts
    5,510
    The problem appears to be with the blower motor shutting down before the t-stat satisfies.

  9. #9
    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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    Additional infractions may result in loss of posting privileges.
    Last edited by jpsmith1cm; 08-19-2012 at 12:12 PM. Reason: Non AOP member

  10. #10
    Join Date
    Jan 2007
    Location
    Jacksonville,Fl
    Posts
    123
    Quote Originally Posted by hvacrmedic View Post
    The problem appears to be with the blower motor shutting down before the t-stat satisfies.
    The wiring is likely loosed up from filter changes, is the control panel is mounted the blower?

  11. #11
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,338
    Hello fellow Star employee

  12. #12
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,515
    Your first post says that the indoor unit is a Rheem.
    Doug

  13. #13
    Join Date
    May 2008
    Location
    Myrtle Creek. Oregon
    Posts
    182
    I am in agreement others that said its the indoor motor. could a bad indoor motor capacitor, or bad bearings
    a stupid question is a question you wont to ask, but don't

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