Spaceman,

Swap the IN and OUT air tubings going to all cylinders, and reverse the channel on your TX.
Electronic valves have a "start" position ("open" or "close" ) , and if you have double-reversed the system by accident during installation, the valves will boot up in the "wrong" direction and then move to the requested signal coming from the RX.
In most cases, this solves such problems.

Success !

Nicolas.