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If it had been the diverter failed set on CH would you still expect some water flow on the HW side? Would it be cold water?
Airhead-
You would just get cold water at supply pressure. The diverter changes the flow of CH water from the rads to a heat exchanger which then takes the heat and passes it to the clean water which is in its own circuit. There isn't really a good reason for the combi to have the ability to shut off the clean water flow.
You can test this. Have your combi run the CH. Turn off the power to boiler, run the hot tap.
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Aye just cold wouldnt cut it off all together. Howards explained it below simply.
Howard
konastab01
That wouldnt cause no water at all, if it was fucked. Have you accidentally turned the hot stop cock off under the boiler? @dinosaur
*seen you got it sorted, common mistake when folk go under it and start touching stuff.