A trip is usually triggered by a cracked heat exchanger

the coil is the likely culprit

Applying 24V will not provide sufficient power for the thermal element

disc guide

MP82 and MP83 actuators

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