trane heat pump

Discussion in 'HVAC Heating & Cooling' started by sbilly, Dec 20, 2009.

  1. sbilly

    sbilly New Member

    Sep 30, 2009
    nashville, TN
    i just bought a house built in 2005 with a Trane Heat pump split system, Mooresville, NC. During the fall the unit worked fine, cooled the house nicely. Now that winter is hear I am having issues. I set the thermostat on 70 and during the day it stays warm, but if I try to raise the set point to 72 i loose heat in the house , at night the temps drop below 40 outside and the temp in the house goes to 65'ish and the outside unit freezes up the coils. The auxillery heat comes on but doesn't do much if any good. I manually put it on emergancy heat and the house will heat very nicely. I can unthaw with a water hose and it will work just fine until it gets cold and freezes over again, usually at night. I called a tech out and after about 30 minutes of looking at it said the DEFROST CONTROL BOARD was out and the defrost sensor had a weak reading. He quoted $850 for repair which I thought was crazy since he would not gaurentee to fix the problem. I checked around and found a Trane distributor and for $56 shipped got the parts and replaced in 10 minutes. It seemed to work as the unit would heat to 72-74 without a problem. But it is mid 30's in NC and colder at night and now it is back to icing up again.
    I can put the unit into AC mode and run for 5 minutes and the unit defrosts fine. I then put it back in Heat mode and it will heat up nicely.

    What else should I check, bad reversing valve? low charge? reversing coil?
    I want to call someone out but don't really trust anyone to not overcharge me.
    $850 for $56 in parts and 10 mins labor i think is kinda over doing it.

    thanks for any help
  2. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    Seems to me any Trane unit installed in 2005 should still be under a warranty from the installer.

    This is not DIY repair. You do not have the gauges, vacuum pumps, etc to service this or the EPA license.
  3. Sponsor

    Sponsor Paid Advertisement

  4. gator37

    gator37 Retired prof. engr.

    Nov 10, 2009
    Retired prof. engr.
    reversing valve

    This may be the old way but try tapping the reversing valve with a hammer "lightly" in the heating mode to see if it is sticking. You will hear it if it releases to the correct position.

    Do you have any aux. electric heat with your system? Probably should have.
  5. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    Not sure, but I think Trane energizes the reversing valve for COOL, deenergized for HEAT.
Similar Threads: trane heat
Forum Title Date
HVAC Heating & Cooling A/C Crankcase Heaters (on a Trane) Aug 16, 2012
HVAC Heating & Cooling Trane vs Day & Night 3 ton air/heating unit Jul 26, 2010
HVAC Heating & Cooling trane heat pump Jan 8, 2010
HVAC Heating & Cooling Trane XE1000 matching air handler/heater question May 17, 2009
HVAC Heating & Cooling Trane HVAC not working Jun 11, 2017

Share This Page