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why does my pilot light go out when I turn my hot water on, its ok when the?

why does my pilot light go out when I turn my hot water on, its ok when the central heatings on, it just keeps going out when I turn the hot water on.
TRL, September 2009
Your description is a bit vague, but from what i can understand, it could be taht your Combi boiler is Scaled up in the area of it's plate heat exchanger?

www.elanar.co.uk, September 2009