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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM safety control for the AMVC800805DNAB gas furnace. This normally-closed thermal switch monitors temperature in the blower or secondary heat area and opens the circuit if it detects an overheat condition — protecting the heat exchanger and surrounding components from damage. A failed or open auxiliary limit is a common cause of a furnace that runs the blower but produces no heat, or that trips out on safety.
Because the color code corresponds to a specific temperature rating, using a generic limit with the wrong set point can either nuisance-trip or fail to protect the furnace. This genuine OEM switch guarantees the correct trip temperature for safe, code-compliant operation.
Rated Easy — usually under 15 minutes. Cut power, disconnect the two spade terminals, remove the mounting screws, and install the exact replacement. Verify continuity at room temperature before restoring power.