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The Goodman 10123529 is a genuine OEM manual-reset high-limit safety switch designed for the Goodman/Amana AMH80803BNBB 80% AFUE gas furnace. This switch is a critical safety control that shuts off the burners if it detects an overheat or flame-rollout condition — protecting the heat exchanger and household from unsafe operating temperatures. Unlike auto-reset limits, the manual-reset design requires a physical button press to restore operation after a trip, alerting the homeowner or technician that a fault occurred.
Because this is a safety-rated control, the genuine OEM switch is calibrated to the exact factory trip temperature for the AMH80803BNBB. Generic or mismatched-temperature switches can nuisance-trip or, worse, fail to trip at the correct threshold. For any safety limit, always use the OEM specified part.
Rating: Easy (2/5). Disconnect the two spade terminals, unscrew the switch from its mounting bracket, and install the replacement in the same orientation. Shut off gas and power first. If the switch tripped, have a technician diagnose the root overheat cause before returning the furnace to service.