Question about Goodman GMS90703BXA Heater

1 Answer

Goodman gmp075-3 Hello, We have a Goodman GMP075-3 Upflow furnance. Our problem is that the heat comes on sporadically. We keep the temperature set at 69 or 70 degrees. Over the past week the heat has not maintained the temperature we have it set at. The heat seems to come on whenever it feels like it. The house temperature has dropped to 65, 60, 50 degrees before the heat came on. Typically, it has been cold during the day and sometime around 3 or 4 o'clock in the morning the heat comes on and stays on for a couple of hours. Three technicians have been out to the house for this problem. The furnance has been cleaned and serviced. The thermostat has been replaced. The gas valve has been replaced. The ignitor has been replaced. The gas sensor rod has been cleaned. Do you have any suggestions. Cold in NJ

Posted by on

  • 2 more comments 
  • RyanEric Apr 05, 2008

    I have been having the same problem of the burners not remaining lit and my temp has dropped to 54 degrees. I've had a tech put and he said it was a cracked heat exchange. Since that has been replaced it worked great... for three days and now we're back to the same problem. My indicator light is blinking a "1" code. I can not find on the furnace anywhere a list of what these codes mean.
    Please help me?
    Blue in Michigan

  • micheleq18 Jan 16, 2009

    I have a Goodman GMP075-3 furnace as well. It is about 16 years old. Recently it has started acting up. First, I noticed that the temp in the house was not reaching what the tsat was set at. That went on for a week or so. I would turn the tsat to about 74 degrees only to have the temp reach 68 or so and then turn off. Then the furnace seemed to quit altogether. Normally the tstat is on HEAT - AUTO and is set at the usual 68 - 70 degrees. At this setting, the furnace was not turning on at all. The temp on the tsat showed about 64 degrees. I turned it up to 80 degrees and waited but the blower never turned on. However, when I set the tsat to HEAT - FAN, the blower came on right away but blew cold air; no heat at all no matter how high I set the temp. The repairman came out and said it was my heat exchanger and handed me a small metal ring apparently to prove his diagnosis. I know nothing about furnaces or any other appliances for that matter. Anyway, he said that he had repaired it temporarily and had no idea how long it would last. He quoted me to repair/replace and went on his way. Approximately 1.5 weeks later the same thing happened. It was after 8 pm so I opted to borrow a few space heaters from a friend and use my fireplace (Duralogs) to get through the night. After about 1.5 hours, the house was at about 62 degrees. I had left the tsat set at HEAT - AUTO but turned to 80 degrees hoping it would start up. At this point, the space heaters had not arrived and I was not using the fireplace. Suddenly the furnace came on and worked for about 2 hours. Then the same thing happened. I used the space heaters for awhile but was nervous about using them while we slept so I turned them off. A couple hours later the furnace kicked on again. It is still working 12 hours later. However, the tsat is not working properly as the house temp never reaches the temp I set. Sorry for the long post but I felt the need to expain in detail to obtain the best diagnosis. I know the unit is old and should be replaced but I cannot do that at this time. Your advice is needed and appreciated. Thanks, Michele

  • cmason236 Jan 31, 2009

    My GMPO75-3 is locking out with a flash indicator of 1. I have had the circuit board replaced, the sensor cleaned, and a new filter put in. It worked for a week perfectly fine. Since then about every 24 to 48 hours it locks out again flashing a 1. The little gold ignitor comes on but the blue flames don't start. If I reset the circuit board the heat starts right away.


  • First you need to make sure that you any restriction on your air flow by that I mean dirty filter, blower wheel, blocked return or sometime your A-Coil could be dirty too. Secondly check the speed of your blower motor it may slow down or stop when it hot. It is sound like your is sit on locked out due to open limit switch.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,420 Answers

I am confident the technician(s) have done this but check anyway.
Gas pressure 4-7 inches W.C for natural, 10 - 11 for Propane.
Air filter clean and unrestricted.
Temperature over supply plenum 140 degrees F.
All registers open and unrestricted.
Vent and intake unrestricted and not blocked.
Condensate hoses free of debris and draining.

OK now lets check to see if the furnace is staying on long enough.When it runs for a heat cycle, is the flame staying on until about 2 minutes prior to achieving the set temperature or is it cycling everyfew seconds and never reaching temp? To check you will need to view the flame through a small viewing port of thru the fins in the front door. Watch them for 10 to 15 minutes.

If they are staying on a long time, we will need to see if the room blower is working properly. If they are going out quickly and or cycling. Get the technician on the pone to talk it over. It could be a safety sensor.

If the blower stays on and the burners are on as well, you have a door open somewhere. Just kidding. Remove the thermostst documenting which wires go where. Take the white wire and cross it with the red wire. This will (or should) turn on the furnace. Clamp them together untill the either the house gets warm or you are confident it is not going to reach temperature. If it did get close to the temperature you wanted, it is a thermostat issue. If not, you got me!

And they say we have an easy job! Get beck to us with your results.

Posted on Jan 23, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Goodman furnace model GMP075-3 pressure switch location

I would google this for the image so you know what you are looking for or look on u tube .

Mar 19, 2018 | Goodman Heating & Cooling

1 Answer

Goodman Model GMV950905DX-an electrical surge burned out the transformer which I replaced, also replaced the circuit board. The variable speed furnace will no longer kick into high speed and it will l

If I remember correctly, there are dip switches on that control board that can be set individually. It is possible that it is just a setup issue. The switch positions should be explained in the installation instructions. I know that some Goodman and Amana two stage furnaces can be controlled by a single stage thermostat, but the dip switches have to be set properly. If the switches are set correctly the furnace will run in low stage heat for approximately 5 minutes and if the thermostat hasn't satisfied yet, it will kick in to high stage heat. I hope this points you in the right direction!

Dec 16, 2014 | Goodman Manufacturing Goodman Gas Furnace...

1 Answer

After one heat cycle, the blower motor keeps running, even after cool down is complete. The furnace will not refire until i turn off the power and wait about 20 minutes for a reset.

your limit switch is opening up, that causes constant fan. Check for flashing codes after flame shuts off and fan continues. Check airflow, filters, lack on return air for possible hi temp limit problems.

Nov 17, 2011 | Goodman Heating & Cooling

2 Answers

How do you change the filter on model# GMP075-3?

When looking at the front of the furnace, toward the top, turn the two black tabs so they are vertical, then pull it forward. This will take off the top panel. Now pull the bottom panel up, then toward you. You can now see and change the filter.

Dec 02, 2010 | Goodman GMS90703BXA Heater

1 Answer

Goodman gmp075-3 gas furnace and the flame cycles

you need the same board. the one you have is not compatible with your unit


Dec 11, 2009 | Goodman GDS80904BNA Open Flame Heater

2 Answers

Goodman gmp075-3 gas furnace and the flame cycles for 4 sec


Dec 02, 2009 | Goodman GMS90703BXA Heater

2 Answers

Gas furnance won't stay lit.

have a furnace man take a look it sounds like the itermitter control

Feb 05, 2009 | Goodman GMS80904BNA Open Flame Mid-Size...

1 Answer

Electric furnace runs but won't shut off on heat setting

I would insist that Sears either have a Senior tech come out and fix it or return it to the state it was prior to them touching. Then call some one else. Have them involve the Goodman rep in your area.

Jan 20, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

AIR or Heat wont come on/ goodman GMP075-3

If there is no blinking light, then the unit is not seeing a call for heat or cool. My guess is a lose or broken wire in the thermostat circuit. Try and putting a jumper across the red and white heat terminals inside the furnace and manually closing the door switch. If you get heat, it's telling you there is a wiring issue. If you get nothing, it's a bad circuit board.

Jun 08, 2008 | Goodman GMS90703BXA Heater

Not finding what you are looking for?
Goodman GMS90703BXA Heater Logo

2,416 people viewed this question

Ask a Question

Usually answered in minutes!

Top Goodman Heating & Cooling Experts

Paul Carew

Level 3 Expert

3335 Answers

Dennis Boxerman

Level 3 Expert

1266 Answers

vance jones

Level 2 Expert

120 Answers

Are you a Goodman Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides