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hot water / radiator fault

Posted: Wed Feb 04, 2009 5:35 pm
by karlmarks
Hi; i have a gas central heating boiler that heats water for the radiators & hot water. When the boiler comes on to heat just the hot water the radiators start getting hot too even though the room stat has not clicked in. If i switch the hot water off and the rads on, the rads do still get hot.
Any ideas, cheers

Posted: Wed Feb 04, 2009 9:29 pm
by htg engineer
Check 3 port valve.

htg