Question about Goodman GMS90703BXA Heater

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1993 goodman status light 4 times blinking

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

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  • atlgeek Jan 25, 2008

    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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  • Anonymous Mar 13, 2014

    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.

  • Anonymous Mar 13, 2014

    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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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

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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

  • joey  shearer
    joey shearer Jan 25, 2008

    I would use a volt-ohm meter to test all for continuity.

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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

  • 4 more comments 
  • nick helpap
    nick helpap Jan 25, 2008

    "4 blinks =open limit

    check main open limit or aux. open limit"

  • nick helpap
    nick helpap Jan 25, 2008

    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.

  • nick helpap
    nick helpap Jan 25, 2008

    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.

  • nick helpap
    nick helpap Jan 25, 2008

    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

  • nick helpap
    nick helpap Jan 25, 2008

    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.

  • nick helpap
    nick helpap Jan 25, 2008

    dont forgetto mark me as fix ya ok

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On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

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Sequence of operation, Gas Furnace.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the ignitor. The ignitor will glow and you will be able to see it if viewed thru the small inspection port. Once the ignitor gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

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