A trip is usually triggered by a cracked heat exchanger

MP82 and MP83 actuators

disc guide

check the cable for cracks or the 005467F electrode for carbon fouling before replacing the ignition module

Lochinvar & A.O. Smith 100296927 Pump Assembly 321702-401 A trip is usually triggeredFor mechanical contractors and facilities managers maintaining high output hydronic systems, the Lochinvar & A. O. Smith 100296927 Pump Assembly is the critical OEM solution for restoring factory spec circulation. This industrial grade circulator is engineered specifically for select Lochinvar boilers and A. O. Smith commercial water heaters, providing the precise head pressure and flow rate required to prevent thermal stacking and ensure efficient