Staff Answer
Sep 26, 2026 - 09:39 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. The 633287 kit is for N641/N841/N1095 serials below 9045737, and it's discontinued.
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