underfloor heating controls

[gazbo]

Having fitted ufh to my conservatory i want to control my remeha broag 24v heating boiler from the conservatory stat alongside my y plan controls.when i connect up it tripps the rcd feeding the boiler.Do i need to change my y plan for a s plan plus so i can run 3 zones to the boiler,ie house ,conservatory,and dhw,Gazbo

 

[stani]

if its tripping an RCD it means you have an earth fault, this means somewhere its wired incorrectly.

 

[gazbo]

It does not trip the rcd until the house stat is turned up,but only trips when both zones are callin for heat.I think the rcd is reacting to a back feed through wiring.Have checked my new cabling and their is no earth fault