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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary safety control for the Amana AMH81155CXCA gas furnace. The light-blue color code identifies its specific factory trip temperature. This auxiliary limit adds a second layer of overheat protection — commonly guarding the blower compartment or a secondary zone of the heat exchanger — and opens the circuit to stop the burners if temperatures exceed the safe range.
When this switch trips or fails open, the furnace will not fire or will lock out on a safety fault. Fitting the correctly rated light-blue switch keeps the layered safety system intact.
Auxiliary limits are matched to a precise setpoint indicated by the light-blue cap — not interchangeable with the pink primary limit. This genuine OEM Goodman switch delivers the exact factory trip temperature, preserving proper safety response. Generic parts with mismatched setpoints risk nuisance trips or unsafe operation.
Easy. Disconnect power, remove the two spade terminals and mounting screws, and install the color-matched replacement. Verify the light-blue code matches your original before installing.