Question about Goodman GMS90703BXA Heater

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My son has a Goodman GMNT furnace in his cabin. Last spring the furnace would try to start and quit. We would turn the thermostat up and restart it a couple more times before it would keep working. Now, nothing works. We can't even get the furnace fan to turn on manually. Thermostat problem, curcuit board problem or where do we start looking? Thank you.

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Hi, on the board you will have a 3 to 5 amp fuse, plug in type just like your auto fuses. It probably blew it which shuts power down on the furnace. It kill power to the thermostat also. If the furnace would try and start and shut back off, you will have what is called a flame sensor that runs along side of the pilot. It is white porcelein, round about about 5" long with a metal tip coming out the end. The other end plugs on the board. The metal tip is in the pilot flame and when they get dirty they will shut the unit off very fast. You can use steel wool to clean the tip or real fine grade sanding cloth. After cleaning this flame sensor it continues to cycle on and off, you should have a led light on the board that will flash. It may have a number of flashes, for instance 4 flashes long and 2 short ones what ever the amount. On the inside of the panel, you will have a code chart and it will point you to the problem according to how many times it flashes. They almost trouble-shoot them selves. If you remove the panel, most have a kill switch on them for safety. So, when you take it off and you have no power to anything and the fuse is good, this door panel switch is around the perimeter that opens the contacts just like your home refrigerator does for the light but works backward the that. Tape it down and it will restore power so you can leave the panel off when checking this out. This will be a easy fix for you. Please keep me posted and be kind when rating me as I know you will. Let me know the outcome as I keep all of your information on hand.
A/C, Heating, & Refrigeration Contractor
PS Be sure to remove tape if you have a switch and make sure the panel is installed right so it closes the switch. Best to you.

Posted on Aug 01, 2010


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