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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the ADSH800403AXAA furnace. Mounted near the blower or in the return-air path, this auxiliary limit provides backup overheat protection beyond the primary high limit. The light-blue color code identifies its factory trip temperature. It opens to shut off the gas valve if dangerous heat builds up, protecting the heat exchanger and surrounding components.
Because this auxiliary limit is color-matched to a specific trip temperature, the OEM light-blue switch is the only way to guarantee the intended secondary-safety response. Generic switches with a different trip point can disable backup protection or cause nuisance lockouts. Match the color code exactly.
Easy (2/5). Disconnect power, remove two wires and the mounting screws, and install the replacement in the same orientation. Verify normal cycling and confirm no airflow restriction caused the original trip.