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The Goodman 10123529 is a genuine manual reset high-limit switch built for AMVC800804CXAB gas furnaces. This safety control interrupts the burner circuit if furnace temperature exceeds its rated trip point — a common result of restricted airflow, a dirty filter, or blower failure — and stays open until it is manually reset, forcing the homeowner or technician to address the root cause before the furnace can fire again.
Universal limit switches often carry the wrong trip temperature or reset style, which either allows dangerous overheating or causes nuisance lockouts. The OEM Goodman 10123529 is calibrated to this furnace's exact trip and reset specification and mounts to the factory location, keeping the flame-safeguard sequence intact.
Easy (2/5). Roughly 15–20 minutes with a nut driver and spade-terminal connectors. Cut all power before servicing. Repeated tripping signals an airflow or blower problem that should be diagnosed, not bypassed.