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Why is my heating coming on?

When I put the hot water on (and not the heating) the radiators are heating up.

Please help!
lozzymacca, October 2008
unable to clarify due to limited information.
1/ If combi boiler divertor valve not seating properly.
2/ If system boiler either 2 port or 3 port valve not seating properly

Both will require competant person to rectify.

John, October 2008