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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM thermal safety control for Goodman ACEC800603BXAB gas furnaces. This auxiliary high-limit switch monitors temperature and opens the control circuit if the furnace overheats — protecting the heat exchanger and surrounding components from damage and preventing unsafe operation. A tripped or failed limit switch will cause no-heat or intermittent shutdown faults.
The OEM 0130F00038 is calibrated to the exact trip temperature specified for this furnace, with the correct light-blue color code for easy identification. Substituting a switch with a different trip point compromises safety — for a limit control, always match the OEM rating.
Easy — usually two mounting screws and spade connectors. Disconnect power before service. Verify the trip rating matches the original before installing.