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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM safety control for the Goodman/Amana ADVC80805CNAA gas furnace. This secondary/auxiliary limit adds an extra layer of overheat protection beyond the primary limit, opening the control circuit to stop the burners if abnormal temperatures are detected in its monitored zone. The light blue color code marks its specific temperature trip point.
The OEM Goodman auxiliary limit is calibrated to the light-blue trip temperature and mounting pattern the ADVC80805CNAA requires. Substituting an incorrect trip rating can cause nuisance shutdowns or defeat the intended protection. As with any safety component, we recommend matching the exact OEM color/temperature specification rather than a generic multi-rating replacement.
Easy (DIY-friendly). Generally two mounting screws and two push-on terminals — about 15 minutes. Disconnect power at the breaker before working, and photograph the wiring before removal. If the switch had tripped, correct the root overheat cause before restoring operation and confirm normal burner and blower cycling afterward.