Question about Goodman GMS90703BXA Heater

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Goodman GMP075-3 Random Incomplete startup

Will run good for a day, then I'll come home and notice it cold in the house.
Sometimes, turning power off to furnace, and turning it back makes it start working for a while.
Other times, the draft motor will spin up for a few seconds, then stop - solid red light. If I wait a while, it will try again. If I power off and power on, the same thing happens, but the motor starts for even a shorter time. 
I replace the thermostat, thinking that I'm getting marginal voltage through, that seemed to help, but then next day, same issue.
I measured 29 volts at the transformer.
Since there is no light flashing, it's like it thinks that the thermostat says it should stop, and not an issue with limit switches, pressure switches, etc.

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  • tim_conama Feb 13, 2009

    I assume that the draft motor starts, and after a set period of time, the pressure switch is expected to close. What is that time period, cuz at times when I turn on the furnace, the draft moter spins for less than 1 second.


    My red LED is on constantly from the beginning.

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If the draft motor starts then shuts right off and then a red light comes on usually means that there is a blockage somewhere. Check the pressure switch line, make sure that it is clear and the hole in the heater that the pressure switch vaccum line runs to is open. If that checks out then make sure that your flue vent cap is on and that it is not pressed down on the flue vent and that the gases can vent properly

Posted on Feb 13, 2009

  • Jeremy Reddick
    Jeremy Reddick Feb 13, 2009

    There is not a set period of time. It depends on basically the pressure inside of the flue to how long the pressure switch will take before it opens or closes. It should run for 30 seconds when all is up and fine until it kicks on the ignitor and run for 30 seconds after the heater is off to continue to remove gases from the heat exchanger. This is a VERY common problem among all heaters. The vent hole i the furnace is VERY small so just a peice of dust can block it and you are stuck without heat..

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