Hello,iv got a worc/bosch 25si/30si combi,which has been switching itself off.When i attempt to switch it on i get a lot of clicking and whirring sounds but fails to switch on.Eventually it will go on for a while and radiators heat up but(sometimes)not as much as they should,when its working the pressure gauge shows just at the top of the lower red segment.Any advice would be much appreciated.The boiler is 4yrs old.Thankyou. Craig.

Craig, January 2010

sounds like your condensing pipes blocked or frozen if you look on worchester website its happening alot with this cold weather happened to mine last night easy to sort just need to clear pipe work on out side off house the goes into ya soil stack

wag, December 2010

requires as service m8/i had same probs but it was condensate siphon trap blocked/but im a gasfitter so could do my own get a service plan/or maintance contract from a repital compant m8 save you loads in long run

paddy, January 2010

Your pressure should be at approx 1.5 bar when the system is cold. If the pressure increases when hot, you need to look at your expansion vessel. It should be charged to approximately 0.5 bar.

Henry, January 2010