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??
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??
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.
"4 blinks =open limit
check main open limit or aux. open limit"
High limit is a normal closed position, and stays that way. Limits open in the event of a filter blockage or a coil blockage.
High limits are located in the upper portion of the unit, locate it and jump that puppy out and see if she runs from there.
Limits are cheap,$6.00 boards on the other hand can run up some cash, $120.00 and up depending on your unit.
On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.
FYI I had a case not long ago of a 6 flash code, found that the ground wire from the control board was not secure. Must of gotton pulled when they replaced the filter
An open limit means the airflow temperature in the heat exchanger was too high or you had a roll out switch trip due to flame entering the burner area. Check your filters and evap coil and make sure they are clean. It would be a good idea to have the heat exchanger check as well for cracks due to how prone GMP-125's were to cracking with poor airflow.
dont forgetto mark me as fix ya ok
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the limit switches (1 main and 1 aux )are attached onto the furnace and I see there are 4 rollout switches ( round and two wire attached and the other side has a switch with pink mark) around the furnace (top, 2 sides and 1 bottom). The filter was dirty and is replaced. is the rollout faulty?
What would be the correct sequence to reset the system?
thx
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model DGAA056,furnace, blows the 3 amp fuse, if both of the limit switches are hooked up, but if you unhook one of the switches the blower fan comes on and the light code reads 4 flashes, open limit switch, also made sure both switches where normaly closed.
model DGAA056,furnace, blows the 3 amp fuse, if both of the limit switches are hooked up, but if you unhook one of the switches the blower fan comes on and the light code reads 4 flashes, open limit switch, also made sure both switches where normaly closed.
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