Question about Goodman GMS90703BXA Heater

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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

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Re: goodman gmp075-3

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

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