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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM safety control (light blue body) designed for the AMES800604BXAA gas furnace and compatible Goodman/Amana models. This thermally activated switch opens the control circuit if the furnace exceeds a safe operating temperature, protecting the heat exchanger and blower assembly from overheating. If your furnace short-cycles on heat, trips out, or fails to fire, a failed auxiliary limit is a common and inexpensive culprit.
This is the OEM Goodman part, calibrated to the exact trip temperature specified for your furnace. Generic universal limit switches require you to match the open/close temperatures and mounting yourself — get it wrong and the furnace either nuisance-trips or loses a critical safety layer. The OEM switch drops in with no guesswork.
Easy (2/5). Two mounting screws and two spade terminals. Always shut off power and gas at the furnace before servicing. If you are unsure, have a licensed HVAC technician perform the swap.