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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Heating Mode (Goodman Service Manual)

· The furnace control checks for an open main limit (this
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· The venter blower is energized.· The vent pressure switch will close when it detects a
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The sequence cannot continue until the pressure switch
closes.

· After a pre-purge of about ten (10) seconds the electronic
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· After a slight delay the gas valve will open.

· The burners will ignite and the flame sensor will detect
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· Thirty (30) seconds after the main valve is energized
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· The furnace will remain in operation until the demand
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· Once the demand is satisfied the venter will shut off,
and the circulating air blower will shut off after the field
selectable time off is attained.

· The furnace will remain dormant until the next demand
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HSI boards do go from time to time, this sounds more like a system control problem.

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