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The Goodman 10123529 is a genuine OEM manual-reset limit switch for AMS80805CXAB gas furnaces. This safety control opens the ignition circuit when it senses an over-temperature or flame-rollout condition, shutting down the furnace to prevent heat-exchanger damage or unsafe operation. Because it is a manual-reset device, it stays open until pressed, forcing a technician to inspect the cause before the furnace can run again — an important safety layer.
This is a factory-calibrated Goodman switch with the trip point specified for the AMS80805CXAB. Generic "universal" limit switches may carry a different set point or reset behavior, which can cause nuisance trips or, worse, fail to protect the heat exchanger. For a safety component, OEM is strongly recommended.
Difficulty: Easy. Shut off power and gas, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Typically 10–20 minutes. If the old switch had tripped, diagnose the overheat cause (dirty filter, blocked flue, weak blower) before returning the furnace to service.
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