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Well, the boiler was fixed by a (proper) heating engineer for £160 and has been working perfectly since. It was the diaphragm (split) and diverter valve (stuck in place) that were the culprits. Needless to say, if you're reading this forum post from the link in www.ratedpeople.com (and...

hmm, thought so. Thanks. Feel a bit embarassed and quite pi$$ed off as the flushing was made to sound like a quick and cheap job as a precursor to changing the valve and diaphragm. Oh well, (expensive) lesson learned I guess. I'll fire off some emails to the Trading Standards and Gas Safe...

Our Alpha combi boiler has been playing up - the radiators get hot when the hot water runs, and recently the pressure has been low, and turning on a hot tap doesn't fire up the boiler to heat the water. From looking on the internet, we'd self-diagnosed that it could be a diaphragm/diverter valve...