Staff Answer
Sep 27, 2026 - 10:36 AM
LI oP means the high temp limit tripped. That's the safety that watches the boiler temperature. Check the limit switch and its wiring and connections first. If it keeps tripping, it's often a sign the cooling unit has failed and the boiler is running too hot. For the N641, the replacement unit is the Nordic 3361A.
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.
