Re: Open Question: cold shower?
The fact that the downstairs hw tap works fine proves that the problem is not with the boiler. Therefore it is probably the mixer tap that is giving you problems.
You could test this theory by turning off the mains water, unscrewing the hw tap mechanism from the mixer, then carefully (with an assistant!) turning on the water again. If the tap is faulty, hot water should gush out of the open hw side (mostly into the bath, hopefully). Maybe a lump of crap will be flushed out of the tap and the problem resolved!
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