How to fix Hot Water on Vaillant VUW Turbomax 242E/282E?

What is the likely fault on boiler ?; the Hot water system no longer ignites when taps are opened with a decent flow. It will only ignite when taps are fully opened, then you can turn taps back again. Central heating side works fine. Pressure is 1.5 bar.

Thanks
Mo, August 2005


done
WATER DIAPHAM PUNCTURED NEEDS REPLACING

STEVE B&H HEATING, August 2005
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