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As previously advised we fitted a new expansion tank, as it was found to be faulty. The problem went away but now IS BACK!!!! :( I've checked the new expansion vessel and it seems that that's now damaged too. There must be an underlying problem which is damaging the expansion tank. Any...

My boiler (a three year old Baxi Combi 133HE Plus) is making an awful noise when hot water is demanded. especially if the heating is off, but does make the whining/grinding noise even when the heating is on. I've found that filling the system slightly alleviates the noise, but it doesn't go...