worcester 28si II boiler?

Before you start paying silly money for call outs, check if you have left the "loop" attached, disconnect it from the supply end to check the valve is leaking. Mine was. £3 fix for a new valve.

Luccarlo
April 2014

Have exactly the same problem. Changed the pressure vessel but that didnt solve the problem.
Worcester technical advice seemed to think there maybe a cross leak on the heat exchanger and have quoted £285 for the repair including 12 months cover, not bad me thinks...

grant2491
January 2011

i got ch working but no hot water

aziz
December 2010

Firstly,put tyre pressure gauge on the expansion vessel should be .5bar If it is not, does water come out, if it does pressure vessel propably faulty, but its far more likely to be heat exchanger had problems when the boilers have been fitted without limescale filters.To proove it turn off water supply to boiler, reset boiler pressure to 1.5bar (cold).Turn on heating if its leetching through to the heat exchanger the pressure should not rise to the same extent,it will of course rise since your heating water but not to same pressure. Replace heat exchanger

P Creed Plumbing & Heating
December 2009

I had the same problem with mine.
Turned out to be the heat exchanger leaking between ch and dhw.
About £240 for exchanger plus fitting. ouch!
I fitted mine myself last christmas eve.

Steve
May 2008

its the expansion vessel at fault if it only happens when heating put on

iain
May 2008

if your filling loop is still connected try disconnecting it as it may be passing through the loop, if not it sounds like the expansion vessel at the back of the boiler its usually a large red drum at the back of the boiler, im not sure if the filling loop is an integral loop on your boiler

paul
May 2008