Question about Goodman GMS90703BXA Heater

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Furnace blower never blows.

Pre-heat fan (cycles), glow plug turns red, gas comes on, then.......it all shuts down. Could this be a thermocouple? Lennox unit 5-6 years old

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  • fredsinfla Jan 13, 2009

    No help. There are two round what appear to be switches above the gas feeders. One is rusted

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It sounds more like the flame sensor ( a metal rod that is by the burners with a wire going to it and it has a ceramic base). you can try cleaning the rod and if that doesnt work they are not to expensive.

Posted on Jan 13, 2009

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I turn the thermostat on and the furnace tries to turn on three times before it turns itself off. The first time I see the gas blower turn on but it does not light the furnace up. The next two times I do...


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1 Answer

I have a Coleman Evcon gas (propane) furnace. When the t-stat is switched to heat the furnace heats up but the blower will never turn on. The unit then shuts down and tries to cycle again. I have replaced...


If the unit fires but the main blower fan doesn't come on the the unit is shutting off on a temp high limit switch and it sounds like the problem is the main blower fan motor or control

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What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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If the flame looks good prior to the room air blower starting but becomes unstable when the blower starts, you have a crack or hole in the heat exchanger. I strongly suggest your technician do a test on it to see.

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