Staff Answer
Sep 27, 2026 - 06:27 PM
An "o" code after installing the 637779 kit usually means the board is looking for a high-temp limit switch. If your fridge doesn't have one (or it wasn't connected), the kit's adapter or jumper for that circuit has to be installed. Go back through the kit instructions for the high-temp limit connection and make sure that plug is connected. If you do have a limit switch, check it for continuity. Call us at 800-712-8822 and we'll help you sort it out.
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.
