Question about Goodman GPC1342H21A Air Conditioner

2 Answers

Heats for 15 - 20 mins then blows cool air

When the unit first turns on the heat strips turn on and the unit blows warm air around 90 degrees, after 15 mins or so the heat strips turn off, but the blower continues to blow air, the room is no where near setpoint, and i have checked to make sure that the thermostat is still sending the signal for heat, which it is, and i have checked the high temp bi-metal switch to make sure that it is not open, the switch is still closed,. The problem only occurs when the temp. outside is 40 degrees or colder. I have had the refrigerant checked everything seems to be up to par. why will it not continue to heat on Cold days?

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  • ickshane Mar 05, 2009

    The unit in question is a standard 3 ton electric heat pump unit, the t-stat is an old mercury switch type, which i have checked to make sure the switch isn't getting wore out. The unit has two 5k watt aux. heat strips which are working well. the unit has a control board that gets the signal from the t-stat and is what switches the aux heat off. How can i tell if the unit is in defrost mode?

  • ickshane Mar 05, 2009

    The t-stat is an old mercury switch type. The unit has two 5 kw heat strips in it that are both working well, it has a control board that is turning that strips off, but the t-stat is still calling for heat. the fan continues to blow untill someone turns it off, the room is still probably 10 or 15 degrees away from setpoint. How can I tell if the unit is in defrost mode?

  • ickshane Mar 06, 2009

    The fan is running but there is no steam from the compressor, the A.C works great but still only heats for 15 or 20 mins.

  • ickshane Mar 08, 2009

    I live in the northwest corner of Georgia. The temp sensor checked out ok. and I will try to find some adjustment on the board.

  • Farley Redfield
    Farley Redfield May 11, 2010

    Is this a heat pump? Is it a window unit, through the wall, ductless mini split, or standard split heat pump system? Does it have back up heat? Is this backup heat Gas or electric?

  • Perry Putnam
    Perry Putnam May 11, 2010

    Also check to see if the outdoor unit isn't in defrost when it is blowing cold air.

  • Perry Putnam
    Perry Putnam May 11, 2010

    Heat pumps are sized for a balance point of 30-40 degrees outside temp. When it gets colder there is less heat in the air for the refrigerant to absorb therefore the air that it puts out is cooler. That is the reason for auxilary heat strips. Some systems are different but most aux. heat will kick in if there is a 2 degree or more difference between the room temp. and the set temp. (what you want it to be). Also if the system has to run 10 min. or more to heat the room it will usually kick in. However it may shut off when it gains ground and gets w/i that 2 degrees and so on. Though the T-stat is calling for heat it may not be calling for aux. heat. Something is telling the strips to turn off either the limit or the T-stat. What kind of T-stat do you have? Have you switched to emergency heat to see if the elements stay on there? Is it possible not all of the aux. heat elements are coming on?

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Look for an outdoor thermostat/temp sensor and if you find one chack to see if its adjustable. (adjustments probably found on the board.)

It could also be wired to bypass the heatpump altogether when temps are below 40.

you will want to adjust, rewire or remove that t-stat/sensor.

In some areas they are really not needed. What state are you in?

Posted on Mar 06, 2009

  • Danny Clark
    Danny Clark Mar 09, 2009

    What is the temp coming out of the vents when the strips are off, but the T-stat is still calling for heat?



    If it is below the indoor ambient temp then you have a reversing valve issue. (The unit is operating in AC mode because the reversing valve has not reversed the flow of refridgerant.)



    If it's only doing it on cold days then I would suspect either a faulty T-stat or a short in the wiring.



    If the cold temps causes the unit to call for aux heat, shutting off the Heat pump, but then never bringing it back on then it could be that the unit never recieves signal to the heat pump to heat. Either due to a bad t-stat or say, the aux wire crossing up with the reversing valve wire (usually white and orange ((Orange being the reversing valve))



    If the temp coming out is only a few degrees higher than the temp going in, and the heat pump is running, then you probably have low refridgerant, or a restriction/bad compressor issue.



    ( ie 65 indoor temp with 69 degree output.)

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If the outdoor unit is in defrost mode the compressor will be running but the outdoor fan will not. You may even see some steam rising from the coils. This mode is to prevent frost or ice build up on the outdoor coil. Essentially it goes into cooling mode w/o the outdoor fan running.

Posted on Mar 06, 2009

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