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central heating problem?

when my hot water is switched on, my central heating also comes on even when it is supposed to be switched off. anybody got any ideas?
mr toasty, June 2008
There are indeed many reasons for this but the most likely one is a sticky mid position valve....

Scooby Doo, June 2008
on what system their are many different systems and resons for this.

hi-spec plumbing & heating, June 2008