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Y plan with Greenstar Worcester boiler

the 3 port valve should give 230vac on the orange if installed correctly, looks like you may have made a mistake on your wiring or the 3 port is faulty.

Yes you were correct. It was my fault, I had not wired up the HWS line from the thermostat. As I was using a second room stat (not a tank stat as per standard Y Plan drawing) I just copied the connections as I had done them before for the main "room" thermostat.

Sorry for being a numpty and thank you for the swift advice.

I now have a kitchen as separate zone so alls well that ends well.
 
Do Worcester-Bosch non-combi boilers support separate flow temperatures for CH and DHW? I may have misunderstood, but should boilers with separate flow temperature controls for CH and DHW be configured as W-plan?
 

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