Atwood Water Heater won't stay lit.

At the end of the burner assembly there is a round metal tab that sticks up in front of the burner tube opening. If that is broken off the flame is not going to burn right and can cause your problem. Also If that tab is in place try taking off your spark electrode assembly it is also you flame recognition circuit. Clean it up with some sandpaper. The slightest bit of rust will prevent the small current from passing through to the control board.