This could either mean the throttle connection is loose, or the throttle is faulty. Do the following test:
1- Unplug the throttle from the system cable, and unplug the system cable from the controller. Plug them back in again with the arrows aligned.
If the PAS is working fine and the Throttle still isn't, then please contact us.
If you don't have a PAS to run your system in conjunction with the throttle, please follow the instructions here