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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM temperature-limit safety control for the Amana/Goodman AMH81205DXBB gas furnace and compatible AMH8-series units. This auxiliary (rollout/secondary) limit opens the control circuit and shuts off the burners if it senses an abnormal temperature condition — typically caused by a blocked flue, failed blower, or restricted airflow — protecting the heat exchanger from overheating.
Limit switches are color-coded to an exact trip temperature — the light-blue 0130F00038 must match your furnace's design spec. Installing a generic or wrong-color limit can allow dangerous overheating or cause nuisance trips. Because this is a life-safety component, only the correct OEM part should be used.
Difficulty: Easy (2/5). Two mounting screws and two spade terminals. Shut off gas and power, note wire positions, and mount the new switch in the same orientation against the heat exchanger or vestibule panel. If the old limit tripped, always diagnose the root airflow/venting cause before returning the furnace to service.
Genuine Goodman OEM safety part — in stock with fast shipping.