Phoenix Engineering speed control


I purchased the Phoenix Engineering speed control for my VPI Classic 3. I purchased  the bigger power supply and the tachometer combination of the speed control.  I notice that I can hear a steady hum coming from the speakers when the speed control us turned. The hum is constant and will not vary if I turn up the volume on the Preamp.  But the hum goes away when I turn the turntable off. The hum return when I turn on the turntable again. I even in unplugged the interconnect from the turntable, but it make no difference.  Does anyone with the Phoenix Engineering speed control experiencing the same issue?
almandog
Can you clarify: display flashes?  Does it display 5 dashes or an RPM reading?   You can put the display to "sleep" with a long press of the on/off button (back panel) or it should blank ~ 5 minutes after the platter stops rotating.  Sometimes, surges or static shocks can cause the sensor to trigger which will take it out of sleep mode, but it should blank again in 5 min.
All segment in the each digit lights up while it flashes. I held the switch down on the roadrunner as suggested. It did not stop flashing after holding it down for two minutes. The Turntable is off while this is going on. I had to unplug the roadrunner for the display to quit flashing. 
Any idea?

UPDATE:

I am please to announce that the issue with the Roadrunner has been resolved.

After talking to Bill at Phoenix Engineering we realized that the Roadrunner was getting power even after the system was turned off.

He recommend that I plug the Roadrunner into the wall socket to see if the LED on the Roadrunner would stop "blinking/flashing", and it did stop. It turned out that my Power Conditioner was at fault; one socket was continuously providing power when it should have been completely turned off. But no worries, I will be getting a MPC 1500.

Another thing I was doing wrong was to turn on/off the TT with the TT switch. Bill said I should use only the Phoenix power switch to turn the TT on/off, even when changing records. The power switch should be pressed until I see dashes (------) on the display, then the platter will stop. Press again and the platter start to turn. Make a lot of sense. I will revisit the manual again and drink it all in this time.

Thanks to Bill at Phoenix Engineering and to everyone for their suggestions.