yes thats usually the fault the diverter 3 way valve..cost about 70 quid. or it could be 1 of the main boards which cost about 65 quid all avalable on ebay
the diverter valve is easy to replace.but you need to drain the water down..main clips to remove.and you twist the valve forward as you remove it.the boards are fairly easy to change too..these boilers have been slammed in the past...but look at skoda now..
padoco
May 2012