Please help. I have a Ravenheat LS80T installed. When i turn on the hot water the burner fires up, then it stops after a few seconds and the flame failure light comes on. The same thing happens with the heating, the burner fires up, the pump runs, the electrode continues to spark with the burner lit, then the flame failure light comes on. I can reset it after a few seconds but the same thing happens time and time again. This is a new boiler. I would be grateful for any advice. Thank you.