my new shower will not commission?

my shower is mira advance s 8.7 thermostatic

fitted my new shower power supply ok water supply ok lots of cold water pressure will not turn off unless i turn it off from the mains tap

tried to bleed through air bleed button but no water comes out of the button

tried to commission it by the seqance that is given in the important notice

as i press the low button it seems to do what it should you here the audible sound and the green light indicator comes on i let it run for 2 minutes ibeleive the service light comes on as well it will not go no further into the commission i havent had any hot water from it yet thankyou from mick