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The Goodman 10123533 is the OEM manual reset high-limit switch for the GMV951155DXBC 96% AFUE two-stage gas furnace. This safety control opens the circuit and shuts down the burners if it senses excessive temperature, protecting the heat exchanger from overheating. Because it is a manual reset device, it must be physically reset after tripping — and a switch that trips repeatedly or fails to reset signals it needs replacement.
OEM vs. Generic: The genuine 10123533 is calibrated to the exact trip temperature Goodman specifies for this furnace and uses the correct terminal and mounting configuration. Generic limit switches with a different setpoint can nuisance-trip or, worse, fail to protect the heat exchanger. For a safety component, always install the OEM part.
Install difficulty: Easy to Moderate (2/5). Disconnect the two wire terminals, unscrew the switch from its mount, and install the replacement in the same location. Turn off power and gas first. If the new switch trips, have the furnace diagnosed for the underlying overheating cause.