Staff Answer
Sep 24, 2026 - 10:35 PM
If your fridge has a high temp limit (thermal) switch, it's wired to the Limit In and Limit Out terminals on the 639593/ 50861, and those wires need to be connected for the board to run. Move them over from your old board exactly as they were. If your fridge doesn't have a limit switch, don't jumper the terminals without checking with us first, since the switch is a safety device. Read more in our post on Norcold thermal safety switches. Since I can't confirm this 100% from here, please email us at info@rvfridgeguys.com or call 800-712-8822 with your model and serial number and we'll double-check it for you. You can also browse www.rvfridgeguys.com.
