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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM secondary safety limit for the AMH80453AXCB gas furnace and compatible Goodman/Amana models. This normally-closed switch provides backup overheat protection at a secondary location on the furnace — such as the blower deck or supplemental heat-exchanger zone — cutting the control circuit if temperatures climb beyond its rated trip point. Its light-blue color code identifies its specific factory temperature setting versus the primary (purple) limit.
The OEM 0130F00038 carries Goodman's exact trip rating, matched to the light-blue color code so you install the correct setpoint. Because this is a safety device, an off-spec generic limit can either nuisance-trip or fail to protect the unit. We recommend OEM for correct, reliable operation.
Easy (1/5) — Power off, remove the two mounting screws, transfer the spade connectors, and reinstall. Confirm the correct color-coded switch before reassembly.