Hi all, I have the above boiler its a 20/25, this morning the flame out light was on, after resetting it would run for a short time and then flame out again. In the past this was due to dirt and dust accumulating around the jet so I cleaned the exterior and replaced. No change, took the jet assembly apart and thoroughly cleaned with an air line and reassembled, much the same but can just about get it to stay lit with adjustment (seems very sensitive) of the air slot but the flame does not sound stable. Will run more stable if set rich but this results in soot being produced, Anyone any ideas.
