Staff Answer
Sep 24, 2026 - 07:22 PM
It's a pretty easy swap. With the fridge off, find the old thermistor clipped to the cooling fins inside the fridge compartment. Unclip it and follow its wire back to where it plugs into the control board. Unplug it there, then route the new 3851210025 along the same path, plug it into the board, and clip the sensor onto the fins in the same spot as the old one. Where it clips on the fins affects the temperature, so match the original position. More tips are in our Dometic troubleshooting guide. If you have any questions, just reach out at info@rvfridgeguys.com or call us at 800-712-8822. You can find everything we carry at www.rvfridgeguys.com.
