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heating only turns on if hot water is turned on then off...

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cobyh

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hi, have a worcester highflow 4.5. working fine until recently where the central heating stopped coming on, although I can manually operate the diverter valve and have it heat that way (if I lock the diverter valve open). So I thought the synchron valve was the issue, replaced that. Now it seems that the only way I can get the central heating to come on is if I turn the hot water on the off again... or lock it in place like before. (making the timer redundant). any help would be greatly appreciated.

thanks
coby
 
Have you checked there is a live feed to the diverter valve from the external controls?
 
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