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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue cap) is the genuine OEM thermal safety switch for the ACVC80603BXBC gas furnace. This normally-closed snap-disc opens the control circuit if temperatures in its monitored zone exceed the factory setpoint — for example during a blower failure or restricted airflow — shutting the furnace down to prevent overheating. The light-blue color code identifies its specific trip temperature, so matching the exact part is essential.
OEM vs. Generic: The OEM 0130F00038 is calibrated to the precise open/close temperatures Goodman specified for this furnace. A generic limit with a different trip point can either nuisance-trip (no heat) or fail to protect against a real overheat. Because this is a safety device, always match the OEM part and its color code exactly.
Install difficulty: Easy to moderate — usually two mounting screws and two push-on terminals, with the switch seated against its mounting surface. Disconnect power before servicing. Confirm the cause of any prior trip (dirty filter, failed blower) before returning the furnace to service.