Question about Goodman GMS90703BXA Heater

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Limit Switch I have a Goodman GMT Furnance. It was blinking for times which indicated an open limit switch. I replaced the limit switch and the aux limit switch. I was able to get the unit to blow warm air on one cycle. The circuit board shows no errors. The unit will start, the ignitor comes on the furnance fires, looks like the blower starts but after a few minutes the unit shuts back off. If it does run there is no hot air blowing into the rooms.

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  • k_matson54 Mar 01, 2009

    I cleaned the filter. I believe the reason for why the unit shuts off is because the lower motor (GE 5KCP39FGV0645AS) is bad. The fan does not spin causing the limit switch to trip. I took the lower motor assembly apart and found a piece where the end of the shaft fits into the back casing had discenigrated. I should know by Monday if I am correct after buying a new motor.

  • k_matson54 Mar 08, 2009

    You are correct when you say the limit switch shut down the system due to overheating. The problem was not the filters but the lower vent motor. Once I replaced the motor the unit has been functioning fine and with the original limit switch.

  • paulcarew May 11, 2010

    have you cleaned the air filter

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It is rare that a limit switch goes bad. It is a safety control. If it is shutting off your furnace there is a problem that it is protecting you from.
If the limit switch is shutting the unit down your furnace is overheating. Check the filters. Check for any obstruction in the blower assembly. Check to see if you can raise the blower speed. Make sure all registers are open in the house. Your evaporator coil could be obstructed if you do not take good care of your filters.

Posted on Mar 08, 2009

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