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The Goodman 0130F00036 Primary Limit Switch (identified by its pink dot) is a genuine OEM high-temperature safety control for the GDH80403ANBB gas furnace. This normally-closed switch monitors the heat exchanger/plenum temperature and opens the burner circuit if the furnace overheats — protecting against restricted airflow, a failing blower, or a dirty filter. A tripped or failed limit switch is a frequent cause of no-heat and short-cycling complaints.
The color-coded trip temperature is critical — the pink 0130F00036 is calibrated to this furnace's design limit. Installing a generic switch with the wrong trip point can cause nuisance lockouts or, worse, defeat the overheat protection. Always match the OEM color and part number.
Easy (1/5) — Two mounting screws and two spade connectors, roughly 10–15 minutes. Cut power at the disconnect before servicing.