My radiators heat up when I only want hot water - I've just been told that the 3 way valve is the problem and needs replacing at a cost of Â£250 +vat.
I'm rather baffled because it's a brand new boiler - only fitted in December. Is the 3 way valve part of the boiler ? And if so shouldn't it be covered by the warranty ? Urgent advice needed please - I fear my ignorance may lead to me being ripped off.