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The Goodman 10123533 is a genuine OEM manual reset limit switch for AMH950904CXAD furnaces. This safety control monitors temperature at the heat exchanger or burner area and opens the circuit to shut the furnace down if it senses an overheat or flame-rollout condition. Because it is a manual reset device, it must be pressed to reset after tripping — a deliberate design that forces a technician to inspect the cause before the furnace can run again.
Limit switches are calibrated to a specific trip temperature. The OEM 10123533 carries the exact factory setpoint and mounting geometry, so it protects the furnace as engineered. A generic switch with the wrong temperature rating can nuisance-trip or, worse, fail to trip when needed. On a safety control, use only the genuine part.
Usually 15–20 minutes. Turn off power and gas, disconnect the two spade terminals, remove the mounting screws, install the new switch in the same orientation, and reconnect. Confirm the furnace cycles normally and the switch resets properly.