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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light blue body) is a genuine OEM thermal safety control for the AMVC80803BNCA gas furnace. This secondary limit adds an extra layer of overheat protection — monitoring a specific zone of the furnace and opening the control circuit to shut down the burners if temperatures exceed the safe threshold. The color code corresponds to the switch's factory trip temperature.
Because the light-blue color denotes a precise trip point, matching the OEM part number and color is essential. A generic limit with a different set point defeats the safety intent of the control. Always replace an auxiliary limit with the exact OEM specification.
Easy — Typically mounts with one or two screws and two spade terminals. Disconnect power before servicing. Verify the replacement is the same light-blue temperature rating and orientation as the original. Professional installation recommended for gas equipment.