Hi, I have a piazetta sabrina that we have had since 2012 and the flame started to be lazy and we can't run it above power level 1 or it over fills the pot. I have done a thorough cleaning of the stove and pipe also changed the door gasket. Seems like it won't go to high fire the exhaust fan acts like it stays in phase 2 although the display says it is on power level 1 could the board be bad? thank you