Question about Goodman GMS90703BXA Heater

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Older model Goodman gas package unit

The unit will go through a heat cycle but the combustion and circulating fans will not shut off, it has had two new boards put in it and is still doing the same thing. Every component in it checks out as good but the fans will stilll not shut off.

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It sounds like it is still receiving a "call" for heat from the thermostat. First check that the thermostat is set for gas heat and not electric.(There may be a jumper or dip switch on the back). Read the directions with the thermostat.

Secondly, Verify that the wiring at the thermostat is correct. (R- to red, W to white, G to green etc.)

Third, If the first two do not fix the problem, then there is definitely a problem in the thermostat wire between the furnace and the thermostat. (usually the "R" and "W" wires will be crossed or shorted to the sheet metal around the furnace. You may just have to replace the entire wire. Best of luck!

Posted on Jan 29, 2009

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