firstly, I am pretty sure the unit pulses the negative not the power to activate the solenoid. make sure there is no break in the wires from unit to the solenoid, they are very small and easily pinched if you don't route them properly. If you can run it on a dyno back probe the earth when target boost is reached and you should see it pulsing
The vr3 thingy is ulikely to be an issue unless the unit never worked, probably just a change in manufacturing over time.
personally i ditched my profec bs because I got sick of them failing in hard use (race/rally), I run the turbosmart now, similar unit but much better made.