I have a valliant combi boiler VCW GB 242, the hot water doesn't cut out any more but continues running even after the hot water tap is turned off, I am currently having to turn it off via the mains switch. The central heating has also stopped working, does anybody have any idea what could need replacing, seems like I will have to call somebody in.

Arnold Palmer, December 2007

sounds like diverter valve may be sticking and keeping flow switch depressed, not moving back to ch mode, diaphragm may need replaced.

Steven R, December 2007