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Boiler is now out of warranty, as it had a two year guarantee, and I bought the flat in July 2005. Initial visit from the WB agent in May (when they diagnosed the fault as overflowing condense tray) was paid for by WB. Visit a couple of weeks ago (for annual service and further investigation...

I wonder whether any of you gentlemen (or ladies) would be kind enough to come up with some ideas to help me solve an ongoing boiler problem that four separate engineers have now failed to rectify. The boiler in question is a Worcester-Bosch Greenstar HE 25 combi supplying heat and hot water...