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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch — color-coded light blue — for the GDH80403ANBC gas furnace and compatible Goodman and Amana models. This secondary thermal safety switch provides overheat protection at a location such as the blower deck or rollout area, opening the control circuit to stop the burners if temperatures exceed the safe range. Like the primary limit, its light-blue color designates a specific trip temperature, so matching the OEM color code is critical for proper protection.
Auxiliary limits are matched to a precise setpoint indicated by their color. Substituting a generic switch or the wrong color can defeat the safety function or cause nuisance shutdowns. Use only the exact light-blue OEM part.
Easy — Disconnect power, remove the mounting screws, transfer the wiring, and install. Simple to replace; be sure to order the light-blue variant, not the pink primary limit.