Dual channel Hive installation

Evening all and a merry Xmas.

Fitted an new dual channel hive today. However, whilst the heating can be controlled via the hive , the water would only operate the 2 port valve when the water tank thermostat was turned off. I am thinking the hive itself is not switching over to Water NO. Tested when switching it off at the receiver but it still has full voltage.

Thanks

Irish

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