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Thanks for the reply. Having checked in the airing cupboard with the HW tank there are 2 motorised valves hooked up to the 22mm feed pipes, one just before the HW tank inlet and the other before a junction heading off into the floor, so presuming this is as you've described with one to control...

Hi all, i'm having an issue DIY replacing a working Potterton EP2002 controller with a Hive system whereby the Potterton Suprima 50 boiler isn't firing when CH is selected. The Hive system is fully set up and has all correct status etc indicator lights. The thermostat triggers the controller for...