Hi all, I am deperate for some help - my controller for my CH and HW
was damaged during some building works. I have bought an identical
controller and fitted exactly as it was but it will only turn on the
boiler for HW.

If I bypass the controller and connect the HW wire and CH wire to the
live - I have both HW and CH fine. But if I connect just the CH to
the live I get nothing??

Any help - I am stuck here!!!

Thanks in advance!