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The Goodman 10123518 is a genuine OEM manual-reset limit (rollout/high-limit) switch for the AMV90453BXBA gas furnace. This normally-closed safety control opens the circuit and shuts down the burners if it senses an over-temperature or flame-rollout condition, protecting the heat exchanger and household from unsafe operation. Because it is manual reset, a trip requires an intentional button press after the underlying fault is corrected — a deliberate safety design.
The OEM 10123518 is calibrated to the exact trip temperature and mounting footprint the AMV90453BXBA requires. A generic switch with the wrong set-point can nuisance-trip or, worse, fail to trip when needed — a genuine safety risk. For a critical safety control, always use the OEM part.
Easy — 15–20 minutes. Cut power at the disconnect, note and transfer the spade wire connections, unscrew the old switch, mount the new 10123518, and press reset. Always diagnose the root cause of a rollout trip before returning the furnace to service.