Found Fryer unit wouldn't start. pulled cover off and tried to fill unit. unit would not fill, noticed water going right down drain. removed drain valve and found clogged with scale. did clean drain valve. while drain valve was apart found boiler had severe built up with scale. did try to clean so unit would at least fill. was able to get it to fill and light. did try flushing unit. made customer aware unit may get clogged again. Will quote replacement of boiler and drain valve. unit is okay for use at this time.