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The 10123529 is a genuine OEM Goodman manual reset limit switch for the AMVC80604BNCA gas furnace and compatible Goodman and Amana models. This safety control monitors furnace temperature and opens the circuit if it detects an overheat or flame-rollout condition, shutting off the burners to protect the heat exchanger and your home. Unlike an auto-reset limit, the manual reset requires a technician to press the button after diagnosing the fault — a deliberate safeguard against repeated dangerous cycling.
This is a life-safety component, so the OEM part's factory-calibrated trip temperature matters. Generic switches may trip at the wrong setpoint — nuisance-tripping when fine, or worse, failing to trip during a real rollout. For any safety limit, always use the genuine OEM control.
Easy to moderate (2 of 3). Remove two mounting screws and swap the spade-terminal wires onto the new switch. About 20 minutes. Because a tripped limit indicates an underlying problem (blocked venting, dirty filter, cracked heat exchanger), diagnose the root cause before returning the furnace to service. Power off before servicing.