I have set my vokera 24 combi to 1.5 bar,when i turn hot water on it goes up to 3 bar.Anyone know what causes this,and what part i would need.

Terry, September 2012

Clean main heat exchanger it has combine heat and hot water build in easy to take it out drain system shut main suppy to boiler undo hot cold pipes pull out two clips heating inlet and out let clid out heat exchanger clean with sprit of salt also take out NTC with 13mm spans clean out as well

ltd, September 2012