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the diverter valve inside most combination boilers can stick fromn time to time..or pass water very lightly, causing a build up of sediment, causing the sticking of the valve making it unable to swich over to the hotwater side, which usually takes preference over the heating (as in if the heating is on..and you turn a hw tap on, you will always get hw water even if the heating isnt upto temp) i digress... Yes i would say, as a plumber myself, without looking at the problem in full the diverter valve is the fault here.though dont count me on it without actually seeing it! hope it helps
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