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?

Posted by on

  • 5 more comments 
  • 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?

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 334 Answers

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.)

×

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 144 Answers

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Goodman gph1348m41ac unit is blowing cool air in heat mode with mid 30s ambient outdoor temp. I turn it off then on and will usually blow warm air but this cycle is becoming more repetitive. any expert...


A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

Tons of possibilities and not enough room to list....

Jan 01, 2015 | Goodman Manufacturing Goodman GPH1348M41 4...

1 Answer

No heat blowing cool air


if your talking heat pump yes. heat pumps only work down to about 40 degrees ambient. you getdown to 19 it needs heat strips or auxilarry heat of some source.

Jan 24, 2014 | Ruud Air Conditioners

1 Answer

Hello, When I set my AC unit to "Heat" and turn it on, the air will come out warm, then after a few hours the air starts to come out cool. To make it warm again I need to set the...


It sounds like you have a heat pump. When you first turn on the system the heat strips will come on and produce warm heat (referred to as supplemental heat strips), as temperatures rise the heat strips will turn off and the "A" coil will just exchange heat to maintain temperature thus conserving energy. . Initially the temps will be around 125 degrees at the register, and drop down to about 105 after the strips turn off.

On some TXV controlled outdoor condensing units the Thermostatic Expansion Valve will stick in the cool position and require replacement this will cause this symptom. It takes several hours to do and requires a licensed technician to do as it involves recovery of refrigerants. I hope this helps

Feb 17, 2011 | Air Conditioners

1 Answer

My rv air condition also has heat, the heat in it is not getting very warm. So days it will burn u out of it and some days it just blows cool air! Any suggestions. It is a dometic


Check the following if you're unit is not giving heat.
1. Keep temp setting +8 degree from your room temp 2. Keep mode in "Heat". And check the click sound in RV when you turn to heat mode. If one failed out of three your unit will not supply heat.

Dec 15, 2010 | Air Conditioners

1 Answer

REPLACED BOTH ELEMENTS GOT HOT WATER FOR 1 SHOW THEN IT GOT COOLER AND COOLER AND NOW ITS COLD ONLY?


Find a reputable HVAC contractor to do a room by room analysis with heat and cooling loads calculated and units sized and duct requirements and compare to what you have.

The air not being cold is not necessarily an indicator of anything malfunctioning. High efficiency units for instance don't produce cold air.

Since you have had someone look at it, the duct work may be collapsed which restricts air flow or uninsulated which warms up the supply air. Either one is a possibility. Any Cox Cable guys been stompin' around your attic lately? Wouldn't be the first time.

Usually, when the air coming out of the vents is not cold enuf it's because your freon level is low. Probably leaking, but they can usually recharge the freon and it will work for a while. Try another repair company and see if they can recheck the freon level.

We have a high efficiency unit and it produces cold air, so I don't know what previous poster is referring to. Air conditioners are supposed to blow cold air.

Sorry, to tell ya but it is normal if the outdoor temperatures are much below 45 degrees. Below 45 degrees there is little heat outdoors for the heat pump to grab to heat the home so it will run 24/7 and blow cool or cold air. Below 45 the temp of the air coming out the vent will decline and you will get no heat from the heat pump itself as you near freezing.

Your emergency heat or auxiliary heat is electric strip heat. But it only kicks in during normal operation if the temp in the house drops 3 degrees below the setting. (some tstats if can be 5 deg.) Otherwise the heat pump will blow cool or cold air the rest of the time if it is too cold out.

To prevent it from running all the time and blowing cold it is recommended if the temp outside is falling below 45 degrees you should just switch to the emergency heat setting, which shuts the pump outdoors off, and just heat with the electric.

But if there is no heat outside the heat pumps will blow cold. They are the cheapest and most efficient forms of heat but only as long as the outdoor temp is above that 45 deg..

I'm guessing that if you haven't experienced this you live in some place with moderate winter temperatures like in Northern Florida and rarely get very cold winter temps like the freezing you have seen there recently.

It will likely blow much warmer when the outdoor temp rises.


Aug 02, 2010 | Air Conditioners

1 Answer

I just had a new a/c - heat pump installed on my 5th wheel. The a/c works well but when I turn on the heat pump it seems to blow air about the same temperature as inside the coach. I seem to hear the...


Hi; I hope You called a company that will honor any warranty on the heatpump. Sounds to Me like I would contact the original installer for more help or free replacement.Also at 55 or 75 degrees outside The heatpump should be providing toasty air. Only at close to freezing temps will You get a reduction in warm air and then the heat strips will help out then also check to see if the unit has outside air dampers and make sure they are closed..alpharome416

Feb 23, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Every time my heat pump turns on, the blue auxilliary light comes on, and it only blows icy air. I do not want to use that much power, so I turn it back down a few degrees. Now, it is 50 degrees in the...


A heat pump starts losing efficiency below 30F or so. The aux. heat helps the heat pump keep up with heat demand. The Aux heat can be electric heat strips or another type of heat. Check to make sure you have power to whatever type of aux heat you have (breaker not tripped, no overloads tripped). If it is electric heat check the heat strips to make sure they haven't burnt in to. Hope this helps.

Jan 10, 2010 | Amana PTH123B25AJ Heat Pump Air...

2 Answers

Central heat does not blow hot air, just warm air weakly


Sounds like some of the elements are not working. You being in Florida they may not have put very many elements in. It was 61 degrees last week. I know because I'm a Dolphin Fan. You will need a current sensing meter to check the elements.

Jan 04, 2010 | Air Conditioners

1 Answer

I have a westinghouse window unit and I think it has heat strips for the heat. How do I tell if it is a true heat pump or if it has heat strips and how do I get to the Heat strips in the unit to check.


If it is a heat pump, the compressor will be running both in cool mode and in normal heat mode.

Confirm the current indoor temperature. Turn the thermostat up one degree at a time until it comes on. This will typically be 1 to 4 degrees increase. As soon as it comes on stop increasing the temp.

If the compressor is running, it is a heat pump.

Check the temperature coming our of the vents at that time. You should have 30 to 60 degrees increase from the air temp going into the unit and the conditioned air temp coming out.

Then turn the T-stat up another 10 degrees. If the temp coming out of the vents increases by 20 degrees or more. the strips are on.

The strips operate in three situations.
1) the system is set to emergency heat
2) The heat pump cannot keep up with the demand for heat. (because its too cold outside, the desired temp setting is greater than 4 to 8 degrees above the room temp, or the HP is malfunctioning.)
3) The HP is in defrost mode

You could also take the panels off the unit and look for a reversing valve, but unless you know what you are looking for you will not recognise it.

Oct 12, 2009 | Air Conditioners

4 Answers

Goodman Air Conditioner not heating well...


Heat pumps in cold climates suffer a number of limitations stemming from the fact that they are designed for air-conditioning applications. As climates become cooler and heating becomes more of the primary HVAC function, one may find that conventional heat pumps lose capacity and do not satisfy the load of the conditioned space. In colder temperatures, a conventional system’s need to defrost can further detract from heating performance. The use of resistance heat or fossil fuels to supplement or replace the vapor cycle. The additional use of supplemental heat to temper cold air blowing into the space during defrosts. As it gets colder outside, the delivery air temperatures inside begin to fall when no supplemental heat is being used. Supply air temperatures that are warmer than the return temperatures add heat to a space, but discomfort occurs when these supply temperatures drop below skin temperature. The air movement can feel cool or even cold. While the heat pump may be operating exactly as intended,the consumer will desire a more comfortable environment.

Jan 18, 2009 | Goodman CKL49AR49 Air Conditioner

Not finding what you are looking for?
Goodman GPC1342H21A Air Conditioner Logo

341 people viewed this question

Ask a Question

Usually answered in minutes!

Top Goodman Air Conditioners Experts

Brandon Berry
Brandon Berry

Level 2 Expert

407 Answers

Dan Webster
Dan Webster

Level 3 Expert

8147 Answers

Tim Whalen

Level 3 Expert

3056 Answers

Are you a Goodman Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...