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No hot water

Hi I got an extension kit recently - the heating is working but the hot water doesn’t. I have a horstmann channel plus h37XL controller. Is there a certain way to wire this up. I’ve 3 thermostats - ground floor and then 2 on the 1st 2nd floor that are controlled by a separate zone - then the hot water. The heating is working fine just can’t get the hot water to fire up. Any suggestions would be great
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