baxi combi 105e stopped working?

T
if the heating is on its fine,im not sure if it cuts out on the hot water... proberly on water??? if its on water it will give you as much hot water as you like.. but does it cut out when it switches back to water??all the mirco switches are ok also water pressure ok & gas pressures ok.i have changed the flame sensor and spark sensor.... poss pcb??? or gas valve?

s hamilton
April 2008

Does it work fine when left to heating only?
And the flame failure only happens on hw

T
April 2008