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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Amana/Goodman AMVC80603BXBC 80% AFUE variable-speed gas furnace. This normally-closed high-limit/rollout switch opens the gas circuit if it senses an over-temperature or flame-rollout condition, shutting the furnace down to prevent overheating and fire. Because it is a manual reset device, it must be physically reset after tripping — and a switch that trips repeatedly or fails to reset should be replaced.
The genuine OEM limit switch is calibrated to the exact trip temperature specified for this furnace, ensuring the safety circuit opens at the correct threshold. Generic switches with mismatched set points can trip too early (nuisance lockouts) or too late (safety hazard). This is a life-safety component — OEM is strongly recommended.
Rating: Easy–Moderate (2/5). Turn off gas and power, disconnect the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. Never bypass a tripping limit switch — diagnose the root cause (dirty filter, blower fault, blocked flue). When in doubt, call a licensed technician.