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Central Heating NOT

would suspect (and this is just a wild guess)

THE VALVE aint working :lol:

can you remove the actuator (the bit on the top) and see if it moves when you select just heating or just water ?
 
what is the purpose of this valve - and why is there a manual override to make it work ? - [dont really know how Central heating systems operate]

I'll check the operation soon.
 
manual overide there to lock open whilst filling and draining system.also handy when motor goes on valve.
 

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