pressure is too high worcester 24cdi?

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