I have a Vaillant Turbomax 242E which has had problems in the past-last time i had no hot water i removed the bottom of the diverter valve and found some grit like substance blocking the venturi-removed & all was fine. However the same thing happened this morning-i removed the diverter valve bottom section expecting to see some debris again but nothing. I have a repair kit which has a diaphram but this has made no differcne. I can see the white lever that is supposed to move when a hot tap is opened but nothing happens. Am i looking at a new diverter valve or anyhthing else to look at? Thanks for any help.