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Hot water control not working

My setup:
Worcester Greenstar 32CDi Combi Boiler + MT10

I disconnected MT10 and installed the extension kit as outlined in the DIY instructions. The instructions told me only to connect two wires, blue (-) and brown (+) to the EMS block of the boiler.

I did this, it powered up, extension kit is on and its all synced and heating controls work perfectly.

However, nothing happens when I try to control water. I suspected it’s not possible to control heating & water and give extension power all from 2 wire but I was assured, if that’s what the instructions say then that is sufficient.

Can someone please assist me with this.


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