Newbie needs help on Yong Heng compressor.

I apologize for another Yong Heng compressor post. I just for the first time hooked mine up to fill the SCBA tank I just got. When I turn on the compressor it builds up air pressure very quickly but it is not coming out the fill tube to fill my tank. I turn it on, close the bleed valves, it will build to 200 bar very quickly, but nothing is coming out of the fill hose. Can someone please tell this dummy what I am doing wrong before I break something. I don't want it to build up too much pressure and pop the burst disc first rattle out of the box.