When i use the hot water i then turn off the tap. About 30% of the time i find the central heating comes on. The hot water icon on the boiler is displayed (not the CH as is suposed to) and the burner lights. The only way i can shut it down is to turn of the boiler at the switch. Only after leaving it 15mins approx, can i turn it back on and the normal function icons are displayed. I have tried setting to holliday mode, reset button including turning combi on while pressing heating icon.

Kevin Vincett, June 2008

seems like a problem with the dhw flow sensor not turning the boiler off once demand has been satisfied (but the diverter valve goes back to resting positon of ch, hence rads getting hot) this could be a pcb issue either

T, June 2008