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The genuine Goodman 0130F00038 auxiliary limit switch is a secondary over-temperature safety control for the VMES960804CNAA gas furnace. The light-blue color code identifies its specific trip temperature within Goodman's limit-switch family. Mounted near the blower or secondary heat exchanger, it opens the control circuit if that zone overheats — protecting the furnace and cabinet from heat damage caused by restricted airflow or blower failure.
The OEM switch matches Goodman's exact color-coded trip point and mounting footprint, ensuring the auxiliary safety trips at the correct temperature. Color-coded generic substitutes are risky because a wrong trip rating defeats the safety's purpose. For any limit control, OEM is strongly recommended.
Easy — two mounting screws and two quick-connect terminals. Cut power at the furnace disconnect, photograph the wiring, and swap the switch. Roughly 15 minutes for a confident DIYer; otherwise call a licensed HVAC tech.
Match the light-blue color code exactly — never substitute a different trip rating. Disconnect power before servicing.