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The Goodman 10123519 Manual Reset Limit Switch is a genuine OEM safety control for Goodman and Amana AMH951155DXAB 95% AFUE gas furnaces. This normally-closed high-limit / rollout switch monitors for abnormal heat or flame rollout at the burner box. If temperature exceeds its trip point, it opens the circuit and shuts down the burners to prevent overheating — then requires a physical press of the reset button to restore operation, alerting the homeowner that a fault occurred.
The genuine OEM switch is calibrated to the exact trip temperature specified for the AMH951155DXAB heat exchanger. A generic switch with the wrong setpoint can nuisance-trip or, worse, fail to protect the furnace. As a safety device, factory-matched calibration is non-negotiable.
Moderate (2/5). Shut off power and gas, note wire positions, unbolt the switch from the burner box, transfer the leads, and mount the new unit. A tripped switch usually signals an underlying issue (restricted airflow, blocked flue) — diagnose the root cause before returning the furnace to service.
Verify against your unit's serial-specific parts list before ordering.