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Can anyone please confirm that the above is a definite test for a faulty DV. If your heating flow pipe gets hot when heating is off and hot water is turned on does this definitely confirm a bad DV? In my case I'm still getting both heating and hot water but when I do both at the same time, quite...

Faulty pump? Would that cause the 22mm heating flow pipe to get hot when heating is off and hot water tap is turned on? Would a faulty pump cause the flow switch lever to not rise on DHW demand but seem to rise normally when heating selected?

After being completely let down by a young newly qualified RGI who was a good friend I have been left to search the forums for assistance. Please help. I have a Vaillant Turbomax VUW 242/1E that is not behaving as it should. It had two faults, one being a leak. This was sorted out by my friend...