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I can turn the valve about 33 degrees by hand

When I turn on just water ,heating comes on ,as I'd changed the honeywell power head last year ,I suspected the tank thermostat . Yes sorry its a y plan

No ,there was no black cable . But if i replace a with a 3 core and earth ,would it go like this .... blue to C Brown to 1 Black to 2 Earth not used. So if i Trace my earth cable from the thermostat back to my honeywell power head v4073a mid position valve box (it should not be connected to any...

It's not battery powered. So ,blue to C Brown to 1 Black to 2 Earth not used. So if i Trace my earth cable from the thermostat back to my honeywell power head v4073a mid position valve box (it should not be connected to any thing ,and the black should be connected to grey

I have a 3 port valve ,traditional gravity fed system .And a hive system I,v wired a exact replacement dragon hts3 Earth to call for heat Blue to satisfied Brown to common As before , Question one -Is this right ? Also When I put hot water only On Heating also comes on .