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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM safety control for the Goodman GCH950453BXAB gas furnace and compatible models. This auxiliary high-limit switch monitors temperature at a secondary location in the furnace and opens the control circuit if it senses an overheat condition — protecting the heat exchanger, blower housing, and surrounding components from heat damage.
The color band (light blue) identifies the exact temperature trip point calibrated for this furnace. This genuine Goodman OEM switch is set to that spec. Generic or mismatched-color switches can trip too early (nuisance shutdowns) or too late (unsafe overheating), so matching the OEM part number is essential for correct operation.
Easy (DIY-friendly). Usually two mounting screws and two spade terminals. Cut power and gas first, note wire positions, and swap the switch. Estimated time: 10–20 minutes. When in doubt, use a licensed HVAC technician.