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The genuine Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is an OEM secondary high-temperature safety control for the Goodman ACVM971005CNAA furnace and compatible models. The light-blue color code identifies its factory trip temperature. As an auxiliary limit, it backs up the primary high-limit by monitoring a secondary zone — commonly the blower compartment or a downflow/horizontal airflow path — and opens the control circuit to shut the furnace down if that area overheats due to restricted airflow or a blower fault.
The OEM 0130F00038 carries the exact trip temperature and terminal layout Goodman engineered for the auxiliary location — the blue code is not interchangeable with the pink primary limit. Substituting the wrong-rated switch compromises the furnace's layered safety protection. Fit OEM and match the color.
Moderate (2/5). Cut power at the breaker, open the blower/access panel, pull the two spade terminals, remove the mounting screws, and install the new switch in the same position and orientation. About 15 minutes; confirm continuity with a meter before reassembly.