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The genuine Goodman 0130F00038 auxiliary limit switch (identified by its light-blue body) is an OEM exact-fit safety control for the Goodman GMH950905CXAC furnace. This normally-closed thermal switch opens the ignition circuit if it detects an abnormal temperature — protecting the furnace and home from overheating caused by restricted airflow, a dirty filter, or blower failure.
Limit switches are calibrated to a specific trip and reset temperature — Goodman color-codes them for exactly this reason. The OEM 0130F00038 guarantees the correct light-blue trip point. A generic or wrong-color switch can trip too early (no heat) or too late (a genuine safety hazard). On a safety control, always match the OEM part.
Easy (2/5). Unplug the two spade terminals, unscrew the bracket, and mount the replacement. Confirm the correct color code before installing. Shut off power and gas first.