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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety cutout for the Amana/Goodman AMES800403AXAA 80% AFUE single-stage gas furnace. This normally-closed switch opens and locks out the gas valve if it senses flame rollout or excessive heat at the burner box — a critical safety response to a blocked flue, cracked heat exchanger, or failed inducer. Unlike an auto-reset limit, it must be manually reset with the button after the fault is corrected, ensuring a technician verifies the cause before the furnace fires again.
The OEM version guarantees the exact factory trip temperature and mounting footprint that the furnace's safety certification depends on. The generic version is a spec-matched equivalent at a lower cost. For a safety device we recommend OEM whenever possible; both are new and calibrated to the same cutout point.
Rated Easy to Moderate (~20 minutes). Shut off gas and power, remove the two mounting screws, transfer the spade wires one at a time to avoid mixups, and reinstall. Important: a switch that trips again immediately signals an active safety condition (blocked venting, dirty burners, cracked heat exchanger) that must be diagnosed — never jumper a safety switch.