hot water / radiator fault

Postby karlmarks » Wed Feb 04, 2009 5:35 pm

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
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Simply Build It

Postby htg engineer » Wed Feb 04, 2009 9:29 pm

Check 3 port valve.

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