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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety component engineered for the Amana/Goodman AMS81005CXAB gas furnace and compatible 80% AFUE models. This thermally-activated switch monitors for excessive heat or flame rollout at the burner box and, when a fault trips it, cuts power to the gas valve to prevent unsafe operation. Because it is a manual-reset device, it must be physically reset after tripping — a deliberate design that flags a real problem for the homeowner or technician to investigate.
OEM vs. Generic: This is the factory-specified OEM switch, calibrated to the exact trip point Goodman engineered for this furnace. Generic universal switches may carry a different temperature rating or terminal layout, risking nuisance trips or, worse, a switch that fails to protect. For a safety-critical rollout device, OEM is strongly recommended.
Install difficulty: Easy (2/5). A basic swap for a handy homeowner or any HVAC technician — typically two screws and two spade connectors, about 10–15 minutes. Always shut off power and gas at the furnace before servicing.