the pressure is up to 5bar(max) how do i reduce it?

ian leak, December 2009

I had the same problem. Heat Exchanger letting by allowing cold mains water feed into expansion vessel hence repeatedly rising high pressure. Replaced heat exchanger and recharged vessel - now works.

Dan, February 2010

look under the boiler there shourd be a white drain off which just unscrews. but you need to find out why its so high either the filling loop is left open or your dhw heat exchanger is passing in which case you need to isolate the cold mains feed into the boiler on the isolation valve

darren, December 2009