Hi Guys ive got one of these multipoint boilers (Vaillant Turbomax Vuw 242E, 282E) and its causing me some pain. The heating works fine but the water only kicks in when it wants to, It had a new divertor valve fitted only 12 moths previous so could it be this again or is there a pressure switch or something else thaty can cause this? If I run the hot water and the boiler doesnt kick in sometimes I can get it to work by switching the boiler off then onn again which it fires up but not always. Please help 
