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The Goodman 0130F00036 Limit Switch (Pink) is the genuine OEM high-temperature limit control for the ACEC800804BXAA gas furnace. The pink color code identifies its specific temperature trip rating. This normally-closed safety switch monitors heat-exchanger temperature and opens the burner/gas circuit if the furnace overheats — protecting against blocked airflow, a failed blower, or a dirty filter. A nuisance-tripping or open limit switch is a frequent cause of no-heat and intermittent shutdown complaints.
Always use OEM (0130F00036) for safety controls. The pink rating is calibrated to this furnace's heat exchanger; a generic switch with the wrong trip point can either fail to protect the unit or trip constantly. Match the color code exactly.
Easy — power off, remove two mounting screws, transfer the wire terminals, and remount. A 15-minute repair for a handy homeowner.