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    Help - only get CH when hot water is on - broken valve?

    Hi there, I have a Potterton Flamingo 40 boiler in an open CH system (Honeywell programmer, Grundfos Selectric pump, ACL 3 port valve, Drayton mechanical room stat). Whenever I turn on the hot water it works fine, and the same goes for the CH if the water is on. But the CH will not fire up...
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