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what is wrong with my ariston euro 27 combi boiler?

when the tap is turned on the boiler does not ignite unless the heating is also running. if the heating is not turned on then no hot water is available. if heating is tuned on first then the hot water operates as normal
pete, June 2006
Most likely to be the water diverter valve (hole in the diaphragm), on some models the diaphragm itself can be changed others the whole valve.

AJB, June 2006
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