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The Goodman 0130F00038 is a genuine OEM auxiliary (secondary) limit switch — identified by its light blue housing — built for the Goodman ACVC800803BXAB two-stage variable-speed gas furnace. Mounted near the blower compartment, this auxiliary limit provides a second layer of over-temperature protection, opening the control circuit and stopping the burners if airflow is lost or temperatures climb beyond safe levels.
Auxiliary and primary limits use different trip points and are color-coded for that reason. Installing the correct OEM 0130F00038 ensures the secondary protection trips at the precise temperature your furnace was certified for — generic look-alikes risk mismatched calibration and unsafe operation.
Easy (2/5). Remove power at the disconnect, transfer the two wire leads, and secure the new switch in its bracket — typically 10–15 minutes. Do not interchange the pink primary (0130F00036) and blue auxiliary switches; verify the color and position before installing.