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bang from boiler?

when my boiler starts first it bangs, but if you turn it off and start again its fine. its a vokera 14-48 se
jack, November 2010
it sounds like ur heat exchanger could be blocked and may need replacing or the pump could be sticking?is the boiler noisy, hissing or making a clanking noise like stones in it?

peter dublin, November 2010
link Click here to see other fixes for Vokera.