i am working on a ruud model ugdg burners come on for 9 sec. and then go out. i have jumped out the 4 safeties, and replaced the flame sensor. still when the burner ignites it does not light the flame light on the board, then the burners go out. the board works on another ruud unit but it does not match exactly the one that was on this unit. i have replaced the t-stat as well because it would not call for heat.
If you have the pressure switch jumped then you must remove the jumper on each start up and after the inducer is running rejumper. The control board needs to see that the pressure switch opens and closes
That is all I have until you get the correct board
John Wayne once said "Life is tough and it is even tougher if you are stupid"