Question about Goodman GMS90703BXA Heater
I have 1993 goodman gas furnace. the furnace is blowing with cold air. no flame. the thermostat is running on battery. the status light on goodman is blinking 4 times. seems open limit switch on the panel description. I replaced the air filter. still no heat coming while fan is blowing. your help appreciated in advance
I have a goodman GMP075-3 that won't turn on. I think it is the pressure switch since I do not have a vent blockage. What is a venter and where can I find it??
Posted on Dec 30, 2008
If the code description for four flashes is an open limit switch, than you will need to figure out how many limit switches (they shut the furnace down in case of overheating) your unit has. They look like small discs with 2 wires attached. Look around the burner tubes for the limit. If there is a little red button than you lucked out it is a manual reset kind, if there is no red button than it will have to be replaced. You can try putting the two wires on the switch together just to test. Of course it is very dangerous to leave it bypassed. Also im sure air filter was so dirty that is why overheated??
Posted on Jan 25, 2008
Witch blower is running, the inducer or the systems blower?
System blower could mean the the high limit is opening and shutting down the systems gas train, I would check this out first.
The other problem could be with the pressure switch for the gas train, it is supplied from the inducer motor, check to see if it is operating fully.
HSI boards do go from time to time, this sounds more like a system control problem.
Posted on Jan 25, 2008
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Posted on Jan 02, 2017
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