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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM overheat-protection control for the VMSS960403ANAA gas furnace. This normally-closed thermal cutout opens the control circuit if the blower compartment or heat-exchanger area exceeds its trip temperature, shutting the burner down to prevent overheating from restricted airflow, a dirty filter, or blower failure. The color coding (light blue) identifies the specific trip point calibrated for this position in the furnace.
Limit switches are matched to a precise trip temperature and reset differential. The OEM 0130F00038 guarantees the correct calibration and terminal orientation for this furnace. A generic switch with the wrong trip point either nuisance-trips during normal high-fire operation or fails to protect the cabinet — a safety risk. Match the light-blue OEM part exactly.
Easy (1 of 5). Disconnect power, note the two spade wires, remove the mounting screws, and install the replacement in the same orientation. Under 15 minutes for most techs. Confirm the switch seats flat against its mounting surface for accurate temperature sensing.