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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch — identifiable by its light blue housing — for the AMSS960805CNAA gas furnace. This secondary thermal safety monitors a critical zone such as the burner box or blower compartment and opens the control circuit if temperatures climb beyond the safe range, typically due to flame rollout or a restricted-airflow condition. It works alongside the primary limit to provide redundant overheat protection.
The color-coded housing corresponds to a specific factory trip temperature — using the wrong setpoint defeats the safety design. The genuine Goodman 0130F00038 guarantees the correct light-blue calibration and the exact bracket footprint. Generic substitutes risk nuisance trips or, worse, failure to trip during a genuine rollout event.
Easy (2/5) — about 15 minutes. De-energize the furnace at the disconnect, note the wire and orientation, remove the mounting screws, and fit the identical light-blue replacement. If the old switch tripped, investigate the root cause (blocked flue, dirty burners, or airflow restriction) before restoring heat.