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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM thermal safety cutout for AMH80803BXBD furnaces. Unlike auto-reset limits, this switch stays open after a trip and must be manually reset — a deliberate design that forces inspection after an overheat or flame-rollout event before the furnace can restart.
The genuine 10123529 is factory-calibrated to the exact trip temperature specified for this furnace's safety circuit. A generic switch with a different setpoint can either nuisance-trip or fail to protect against rollout — an unacceptable risk on a combustion safety device. OEM is strongly recommended here.
Difficulty: Easy (1/5). Two-terminal spade-connector swap with one or two mounting screws. Disconnect power, transfer the wires, and mount the replacement in the same position and orientation. About 10–15 minutes.
Important: if this switch has tripped, find and correct the root cause (blocked flue, cracked heat exchanger, or flame rollout) before resetting or replacing it. De-energize the furnace before servicing.