burner

Utica M150AGB, Natural gas boiler There are 3 burner tubes. Sometimes, the middle tube [only] will have a blue flame in the venturi for the entire burn cycle. This happens [randomly] about 5% of the cycles. During the flashback, I can lower then raise the T-stat, and the next burn there is no...

Good afternoon everyone! I have a 10 yr old Rheem 50 gallon water heater. Recently I discovered I had no hot water and a water leak from the hot water inlet. I repaired that, drained the tank multiple times and cleaned out the water in the drain pan and can't get the burner to stay lit more than...