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This genuine OEM 0130F00038 auxiliary limit switch is a normally-closed thermal safety cutout for the Goodman/Amana AMEC800805DXAB furnace. Identified by its light-blue marking, it monitors temperature at a secondary location (blower deck / auxiliary point) and opens the circuit if heat rises beyond the safe threshold — protecting against overheating from restricted airflow, a failed blower, or a dirty filter.
The OEM switch is factory-calibrated to the exact trip temperature engineered for this furnace — matching by color and part number ensures the correct setpoint. Generic universal limits require matching temperature ratings and often different mounting; for a safety component, OEM is the safe choice.
Easy (2/5) — Disconnect power, remove the two mounting screws and the two spade terminals, and install the replacement in the same orientation. Verify the color/part number matches before ordering. About 15 minutes with a nut driver.