Question about Goodman GDS80904BNA Open Flame Heater

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I have a goodman gmp075-3 and it is flashing # 4 code

The blower on exaust will stay on and wont shut off the light blinks 4 times it says open limit switch

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  • eclipseprodu Feb 02, 2009

    I'm also getting a flashing #4 code light but when my furnace is turned on, the cold air fan engages but not the rest of the system. The ignitor and exhaust fan do not engage at all. Can a bad limit switch cause the system to shut down completely?

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This information saved was incredibly useful and I appreciate the shared knowledge. Thanks much!

Posted on Jan 21, 2009

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There is a Primary High Limit Switch towards the middle of the furnace, it more than likely needs to be replaced, very common to go out only after a few seasons. Also, you could have a flame rollout switch tripped that will signal the same code, these switches are re-settable and are located on the outer, top and sides of the burner assembly, they’re about ½ inch in diameter with a red push button in the center and two wires “ usually purple” coming off of them.

Hope this helps

Posted on Dec 02, 2008

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