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Thanks for the response. I have tried what you suggested by swapping the grey for the black (from cable A) in terminal 3 of the wiring centre. Turning on the hot water works as it did so rules out a problem with HW NO. Zone 2 thermostat also works for the CH upstairs. I did a belt and braces...

Hello. I've recently purchased a Hive multi zone self install kit (2 heating zones and hot water system) to replace my Horseman Centaurplus C17 and Horstmann Centaurstat 7 thermostat. I live in a relatively new house with two zones for controlling upstairs and downstairs heating, with separate...