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The genuine OEM Goodman/Amana 10123539 Manual Reset Limit Switch is a critical flame-rollout safety control for AMES960603BNAA gas furnaces and compatible Goodman/Amana models. When it detects abnormal heat or a flame rollout condition near the burner box, it interrupts the gas valve circuit to shut the furnace down — protecting your equipment and home from overheating.
Because this is a life-safety component, an exact-trip-temperature match matters. Generic switches may carry an incorrect open/close set point, causing nuisance shutdowns or — worse — failing to trip. This OEM 10123539 is factory-calibrated to Goodman's precise safety spec.
Moderate (2/5). Shut off power and gas, remove the two mounting screws, transfer the spade wire connectors, and reinstall. If the switch tripped, diagnose the underlying rollout cause before restarting.