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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the AMH80804BNAA gas furnace and compatible Goodman/Amana models. This normally-closed high-limit switch monitors furnace temperature and trips to shut off the burners if the unit overheats — protecting the heat exchanger and preventing unsafe conditions. Because it is a manual reset design, it must be physically reset after a trip, alerting the homeowner or technician to an underlying airflow or overheating issue.
This genuine OEM switch is calibrated to the exact trip temperature and reset threshold specified for the furnace. Generic limit switches with incorrect trip points can either nuisance-trip or, worse, fail to trip during a real overheat event. For a safety device, always install OEM.
Difficulty: Easy — Usually a two-wire, single-bracket replacement taking 15–20 minutes. Shut off power first and confirm correct terminal connections. Because it is a critical safety control, replacement and post-repair testing should be done by a licensed HVAC technician; investigate the cause of any repeated trips.