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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is the OEM secondary high-limit / rollout safety control for the AMEC800803BXAA gas furnace. It backs up the primary limit by opening the control circuit if temperatures rise in a monitored area such as the blower compartment or burner box, cutting the gas valve to prevent overheating. The color-coded light-blue cap identifies its specific trip temperature, so matching the exact part is essential.
The light-blue color denotes a factory-set cut-out temperature; installing a switch with a different trip point compromises the safety chain and can cause nuisance shutdowns or leave the furnace unprotected. This OEM Goodman auxiliary limit carries the correct rating and mounting for a true drop-in replacement that keeps the certified safety design and warranty intact.
Easy (DIY-friendly, 15–20 min). Disconnect power, unplug the two leads, remove the mounting screws, and install the matching light-blue OEM switch. Confirm and correct any airflow issue before returning the furnace to service.