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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM high-limit safety control for the Goodman WGFM28070V4BXAA gas furnace. This normally-closed thermal switch opens if temperatures exceed its trip point — protecting against overheating from restricted airflow, a dirty filter, or blower failure by cutting the heat call. The light-blue housing/dot identifies its specific temperature rating.
Because this is a safety device, the trip temperature must match the furnace's design exactly — that's what the light-blue code specifies. The OEM 0130F00038 guarantees the correct set point and terminal layout. Generic or wrong-rated switches can nuisance-trip or, worse, fail to protect the unit. Always replace safety limits with OEM.
Easy. Cut power, note and transfer the two spade wires, remove the mounting screws, and install the matching switch. A 10-minute repair — never bypass or jumper a tripped limit; find the airflow cause.