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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Amana/Goodman AMVM970803BNBA modulating variable-speed gas furnace. This manual-reset high-limit (rollout/limit) switch opens the ignition circuit if it senses abnormal heat, protecting the heat exchanger and burner compartment from overheating or flame rollout. Because it is a manual-reset device, it must be pressed to restore operation once tripped — signaling the technician that a fault occurred and needs diagnosis.
OEM vs. Generic: Safety limit switches are calibrated to a specific trip temperature matched to the furnace's heat exchanger and airflow design. The genuine 10123529 opens at Goodman's engineered set point; a generic switch with the wrong temperature rating can trip nuisance faults or, worse, fail to protect the furnace. For safety controls, always use the exact OEM part.
Install Difficulty: Moderate (2/5). Shut off gas and power at the disconnect. Note wire positions, disconnect the two spade terminals, remove the mounting screws, install the new switch on the same bracket, and reconnect. Restore power and cycle the furnace to confirm normal operation. Never bypass a tripped limit switch.