Question about Goodman GMS90703BXA Heater

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My goodman will not lght when it get cold but when its like 55 degree it comes on

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Sounds like your thermpostat is either bad or just out of level. If its just out of level then you will have to level it if not then you are going to have to replace it. Get a digital thermostat and save some of your money by using the setback features. I personally reccommend Honeywell thermostats due to the fact of they are very reliable and the instructions are real easy to follow.

Posted on Jan 21, 2009

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1 Answer

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1 Answer

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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.

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1 Answer

Goodman Furnaces


what kind of thermostat do you have? make sure all wires are hooked up on thermostat properly for emergency heat operation. hope this helps

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