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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue cap) is a genuine OEM thermal safety switch built as an exact-fit replacement for the AMH81205DNBA gas furnace and compatible Goodman/Amana models. This normally-closed switch opens the control circuit and shuts off the burners if it senses an overheat or flame-rollout condition, protecting the heat exchanger and cabinet.
A tripped or failed auxiliary limit typically shows up as a furnace that won't fire, locks out on a fault code, or heats briefly then stops. When the switch has opened permanently or lost calibration, replacement restores the safety interlock.
OEM vs. Generic: The genuine switch is set to the factory trip temperature and uses the correct bracket and terminal orientation. A generic switch with the wrong set point can nuisance-trip or, worse, fail to protect the furnace. For a safety-rated device, always match the OEM part.
Install difficulty: Easy. Cut power, note wire positions, unscrew the switch from its bracket, transfer the two spade connectors, and remount. Confirm the color/temperature rating matches before installing.