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The Goodman 10123529 is a genuine OEM manual-reset high-limit switch for the Amana/Goodman AMH80603ANAA gas furnace. This safety control opens the ignition circuit if it senses excessive temperature or flame roll-out, shutting the furnace down to prevent heat-exchanger damage and fire. Unlike auto-reset limits, this switch stays open until manually reset — a deliberate design that forces a technician to investigate the root cause before the furnace runs again.
OEM Goodman limit switches are calibrated to the exact trip temperature your furnace requires. Because this is a life-safety component, an incorrectly rated generic switch can trip too late — or fail to trip — during a genuine roll-out condition. Always use the factory-spec OEM part for safety controls.
About 15–20 minutes. Shut off power and gas, note or photograph the wiring, remove the two mounting screws, transfer the spade terminals to the new switch, and remount it in the same orientation. After installation, press the reset button, restore power, and verify a full, fault-free heating cycle. If the switch trips again, diagnose airflow and combustion before returning the furnace to service.