Worcester 350 over pressure?

it was the expansion tank, the engineer said about 5 to 6 years out of one. Mines laster 17 so its done good, thanks for the answers and the diagnosis.

Nob
November 2008

the filling loop is still conected,and still fills the system which is stable untill the heating is used. I have a worcester engineer coming thursday so will add the result. I'm guessing at the expansion tank..

Nob
November 2008

has it got a filling loop still connected? when it fails you get the symptoms you describe. if so need not cost the earth to fix.

plumbersw15@talktalk.net
November 2008

Your secondary heat exchanger is the most likely cause (if pressure builds up when system is cold..not in use) if not it will be the expansion vessel.Best to also change the safety valve at the time of repair.Do Not use anyone who is not competent with these boilers...Not a cheap fix but a poor engineer will cost you a lot more money

chris(ex gas engineer 30 years)
November 2008