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The Goodman 20269903 Auxiliary Limit Auto-Reset Switch is a genuine OEM safety control for the GMV80704BXBA gas furnace. This normally-closed thermal limit monitors cabinet temperature and opens the circuit if the furnace overheats — protecting the heat exchanger and blower — then automatically re-closes once temperatures return to a safe range.
Safety limits are calibrated to a precise trip temperature matched to the furnace design. Genuine Goodman switch 20269903 carries the correct open/close set points; a generic substitute with the wrong calibration can nuisance-trip or, worse, fail to protect the unit. For a life-safety component, the OEM part is the right choice.
Moderate. Disconnect power, remove the two mounting screws, transfer the wire leads to the new switch, and remount in the original location. Roughly 20–30 minutes. Verify correct blower and burner operation after replacement.