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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control designed for the ACVC950915DXAB high-efficiency gas furnace. This auxiliary limit acts as a secondary thermal protection device, opening the control circuit if temperatures inside the cabinet or blower compartment exceed safe operating limits. When your furnace short-cycles, locks out, or stops heating, a failed auxiliary limit is a common culprit — replacing it restores safe, reliable operation.
This is the genuine OEM Goodman part, calibrated to the exact temperature trip point engineered for your furnace — critical for a safety device where a mismatched generic switch can nuisance-trip or fail to protect the heat exchanger. Aftermarket generics may save a few dollars but rarely match the factory calibration or the keyed terminal layout.
Easy (1 of 5). Most homeowners with basic tools can swap this switch in 15–20 minutes. Shut off power and gas at the furnace, photograph the wiring, remove the two spade connectors and mounting screws, install the new switch, and reconnect. If you're unsure, a licensed HVAC technician can complete the job quickly. Always verify power is off before servicing.