no cold water in shower

[tegs]

Hi All

First time on the forum

I have just fitted a new hansgrohe thermostat concealed shower unit to a gravity system using existing pipework thoughly flushed both hot and cold sides through the Ibox then fitted the thermostat unit but when i try to turn the the temperature to the cold it just shuts the cold water supply. So no blockage cold getting to the Ibox do you think the non return vale within the thermostat unit could be faulty bearing in mind this is a brand new shower unit. the hot is on the left and the cold is on the right of the thermostat unit as the instructions.

Any advice would be most welcome.

Tegs

[bobplum]

morning
cold / hot is this from the back view or front view could be the pipes are in the wrong place
bob