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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control designed for Goodman and Amana gas furnaces, including the AMEC800804CXAB model. This high-limit switch monitors heat exchanger temperature and shuts off the burners if the furnace overheats, protecting your equipment and home from unsafe conditions.
Unlike auto-reset limits, the manual reset design requires the switch to be physically reset after a trip, prompting a technician to investigate the root cause of overheating — such as a dirty filter, blocked flue, or failing blower. A tripped or failed limit switch is a common cause of a furnace that won't fire or that cycles on the high limit.
This genuine OEM limit switch is calibrated to the exact trip temperature specified for your furnace, ensuring the safety circuit behaves as the manufacturer intended. Generic switches may carry different temperature ratings that can cause nuisance trips or, worse, fail to protect the heat exchanger. For a safety component, OEM accuracy matters.
Easy — Power off the furnace, disconnect the two wire leads, unscrew the switch from the heat exchanger, and mount the replacement. Typically a 10–15 minute job for a handy homeowner.