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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary overheat safety control for the VCES960403BNAA gas furnace and compatible models. This auxiliary limit provides backup high-temperature protection beyond the primary limit — typically guarding the blower compartment or a secondary zone of the heat exchanger. If temperatures exceed the safe threshold, it opens the control circuit and shuts down the burner. The light-blue color code identifies its specific trip rating, so matching the exact part is essential.
Limit switches are color-coded by trip temperature for a reason — installing the wrong rating compromises the furnace's layered safety design. A generic switch that looks similar may carry a different setpoint, causing either false trips or a failure to protect against genuine overheating. This genuine Goodman OEM auxiliary limit matches the factory light-blue rating exactly, preserving the intended safety margin.
Easy (1/5). Held by one or two screws with push-on terminals. Disconnect power, match the light-blue rating to the original, and confirm secure mounting to the metal surface it senses. Inexpensive insurance for safe furnace operation.
Verified fit for the VCES960403BNAA — always replace with the matching color-coded OEM part.