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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue body) is a genuine OEM secondary safety control for ACES960403BNAA gas furnaces and compatible Goodman/Amana models. This auxiliary limit backs up the primary high-limit, opening the gas valve circuit if it detects abnormal heat near the blower compartment or burner area — a common cause of intermittent no-heat lockouts on furnaces with restricted airflow. The color-coded light-blue housing identifies its specific temperature rating, so matching the OEM part number is essential.
The OEM auxiliary limit is calibrated to the exact trip temperature indicated by its light-blue color code. Installing a switch with a different rating — even one that looks identical — can cause nuisance trips or compromise overheat protection. OEM guarantees the correct setpoint and keeps the furnace's safety chain factory-accurate.
Easy. Cut power, note the wire connections, remove the mounting screws, and install the replacement in the same orientation. About 10–15 minutes for most DIYers.