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The Goodman 0130F00038 is the light-blue auxiliary (secondary) limit switch for the ACEC960803BNAA gas furnace. Color-coded by trip temperature, this auxiliary control provides backup overheat protection — commonly mounted near the blower deck or burner box to catch abnormal heat conditions the primary limit might miss. The light-blue band identifies its specific factory temperature rating, so matching color and part number is essential.
Auxiliary limits are calibrated to a precise cutout temperature indicated by their color band. Installing the wrong color or a generic equivalent changes the trip point and can either disable protection or cause nuisance shutdowns. The genuine light-blue 0130F00038 guarantees the correct calibration and bracket fit.
Easy (1/5). Cut power, disconnect the spade terminals, remove the mounting screws, and install the matching light-blue replacement. Verify the color band matches the original before powering up.