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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for AMVC80805DXBD gas furnaces. This normally-closed switch opens and shuts down the burners if it senses an over-temperature or flame-rollout condition, protecting the heat exchanger and your home. Because it is a manual reset device, it stays open after a trip until the red button is pressed — a deliberate design that forces you to investigate the root cause (blocked flue, dirty filter, cracked exchanger) before the furnace can run again.
Limit switches are calibrated to a specific trip temperature. A generic switch with the wrong setpoint may nuisance-trip or, worse, fail to trip when it should. This OEM Goodman switch carries the exact factory temperature rating and terminal layout, so it protects as designed and drops right into the original bracket.
Easy. Power off the furnace, unplug the two spade connectors, unscrew the old switch, and mount the new one. A repeat trip after replacement means an underlying airflow or venting problem — do not bypass the switch.