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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue identifier) is the genuine OEM thermal safety control for AMH81205DXAA gas furnaces and compatible Goodman/Amana models. Mounted on the blower or supply plenum, this auto-reset switch opens the control circuit if supply-air temperature climbs beyond safe limits — typically from a failed blower, blocked filter, or restricted ductwork — protecting the heat exchanger and cabinet from heat damage.
The light-blue OEM 0130F00038 is factory-calibrated to the exact open/close temperature Goodman engineered for this cabinet. Generic limits with the wrong trip point can nuisance-trip during normal operation or fail to protect the exchanger. Matching the OEM color code guarantees the correct thermal setpoint.
Rated Easy — under 15 minutes. Disconnect power, remove the two mounting screws, transfer the spade connectors to the new switch, and remount. Always confirm the color/temperature code matches the original before installing.