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Normally there's a diverter valve which switches from supplying the CH to HW and back based on demand. They can fail, there are a lot of other reasons you might be having problems but that is one.
Airhead-
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.
konastab01
why is my combi boiler not giving me any hot water? no water at all from the hot tap. cold water is fine and the heating is fine but not a drop from the hot tap.
it's a valiant ecotec plus 831 and it has never given us any problems before.
I only noticed the problem after spotting that the booiler pressure was very low and then, when I tried to use the filling loop, nothing happened. normally when I open the valves I can hear water rushing in but this time there was silence.
I turned the boiler off and on and the heating fired up which raised the pressure to normal but then I realised that the tap was dry.