Firstly youve lost negative feed to your valves the white 3 pin connector that forkingabout is talking about you will see 2 of the pin are single wires are negative and the third pin with the 2 wires joined together is your positive feed make a link wire and join the 2 single negative wires together and try to operate if everything works the problem is definetly in the overhead cable. ex BT engineer.
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