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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a genuine OEM thermal safety cutoff for the ACSS920603BNAA gas furnace. It monitors temperature in its mounting location and opens the control circuit if the furnace overheats — protecting the heat exchanger and cabinet from damage. The color code identifies the switch's specific trip temperature, so matching it exactly is critical.
Because this is a safety device, the genuine OEM 0130F00038 is the only correct choice — its trip point and reset behavior are matched to your furnace. The light-blue rating must be replaced like-for-like. Installing a generic switch with the wrong temperature rating can allow dangerous overheating or cause nuisance shutdowns. Always replace with the identical OEM part.
Easy (2/5). Usually two mounting screws and two spade connectors — about 15 minutes. Disconnect power and gas before servicing. Confirm the new switch's color code matches the original before installing.