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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the ADVC81005CXAA gas furnace. Working alongside the primary high limit, the auxiliary limit adds an additional layer of overheat and rollout protection, opening the control circuit and cutting the gas valve if temperatures exceed its rated trip point. The light-blue color code marks its specific temperature rating and must match exactly for safe operation.
Because this is a safety device with a coded trip temperature, only the exact OEM part should be used. The genuine 0130F00038 light-blue switch restores factory protection specs. Substituting a different color or a generic switch risks either bypassing critical overheat protection or triggering nuisance no-heat lockouts.
Easy. Two-screw mount with push-on terminals. Cut power and gas before servicing, verify the light-blue temperature code, and replace. Inspect for the airflow or venting fault that caused the trip.