we have a Vokera linea max boiler. it is 11 years old and for the last few years when we start to use the central heating in the mornings there is often no hot water and no central heating. after 10 minutes or so and we try to draw hot water all is well. The repair company have changed just about every part in the boiler including pressure tanks and only last week the pcb and temp. sensor. any ideas.

Liz, January 2011