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Sorry to drag up an old thread, but I have a 'howling' C28 as well! CH is fine, HW makes it scream the house down .. starts quiet, gets progressively louder. Doesn't take long, filling a sink to do the washing up will do it. I put on the cold water full chat whilst the noise was going, as...

Afternoon all! ...in DIY hell today, and this one is getting me grief! Boiler works fine, CH and HW both pretty good. However sometimes under heavy HW demand (CH seems OK) like when running a bath the thing wails like a banshee .. to the point of it sounding really bad :( Any ideas...