Question about Goodman GMS90703BXA Heater

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Goodman Furnace Intermittent

I have been having intermittent problems. Before the blower fan would wait too long to kick in and hit the high limit and would shut things down and then the blower would run till it cooled off and then it cycled again. Now the vent fan (exhausts gases) is running pulses on and off and of course shuts the burner down so all I get is cold air. But sometimes it runs sometimes it doesn't. The technician replaced the control board for the second time( to correct the timing of the blower) ..didn't change anything so the tech installed a relay to bypass the blower control so now the blower starts when the thermostat calls for heat and now I am having pulsing with the vent fan..this unit is driving me to drink! any suggestions appreciated?

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Does this piece, have an economizer and or vent draft options installed? I hope not. If not, I had the same sort of problem with a Payne unit, sort of the same style. First things first. bypass the thermostat by making a jumper or connecting the red to the white wire on the thermostat, see if that stops the problem. Repair techs are all to anxious to replace the board anymore. If the repair man installed a relay to bypass the blower control he is in over his head, the limit switch determines when the fan shuts on & off based on temperature. There is a relay on the control board that basically carries the load for the motor. Dont have anything else installed that need not be there (there is enopugh crap already from the factory) If you want to really fix this I need to know if you have and can read a volt/ohm meter and can understand a wiring diagram, hopefully yours is still there. let me know after the thermostat thing and I can walk you through this.

Posted on Dec 25, 2007


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