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The Goodman 10123529 is a genuine OEM manual-reset high-limit (rollout/overheat) safety switch for the AMH81005CXBC gas furnace and compatible Goodman/Amana models. It opens the ignition circuit and shuts the furnace down if it detects excessive temperature — typically from flame rollout, a blocked heat exchanger, or restricted airflow. Because it is a manual-reset device, it must be physically reset after tripping, alerting the homeowner to a condition that needs inspection.
The genuine 10123529 is calibrated to the exact trip temperature Goodman specifies for this cabinet. Generic limit switches with the wrong setpoint can either nuisance-trip or, worse, fail to protect against a real overheat. For a life-safety control, always use OEM.
Easy (2/5). Disconnect the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. If the switch keeps tripping, diagnose the root cause (airflow or rollout) before returning to service. Shut off power and gas first.