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The Goodman 20269903 Auxiliary Limit Auto-Reset Switch is a genuine OEM safety control for the AMV80905CXBB and related Goodman/Amana gas furnaces. This auxiliary limit switch continuously monitors temperature and shuts off the burners if the furnace overheats — protecting the heat exchanger, blower housing, and surrounding components from heat damage. As an auto-reset device, it re-closes once safe operating temperature returns.
This OEM Goodman limit switch is calibrated to the exact trip temperature specified for your furnace. Generic switches often carry incorrect open/close set points, causing nuisance shutdowns or — worse — failing to trip when needed. On a safety-critical control, we recommend OEM only.
Difficulty: Moderate. Disconnect power, note wiring orientation, unclip or unscrew the old switch, and mount the replacement in the same position. Restore the two spade connectors and confirm heating cycles complete without tripping. A multimeter continuity check confirms correct operation.