[Thomas Porfert]

The ESC is plugged in the correct way on the receiver because the steering works, if it was backwards then you would not get any receiver response; unless you are using an external power source to the receiver.

Does it still hook up to the Castle Link? Never hurts to try a firmware update, but I doubt it will fix the problem. Has the speed controller ever worked properly? If so, then what happened between when it was working and now? Was it working when you put it away, pulled it out again and now this? Have you changed radios recently? Taken the car apart and reassembled? Had a really bad crash recently? Usually things like this don't just happen and causality is key to finding and fixing the problem; that being said, sometimes things can just happen and there is no explaining the occurrence.

It sounds like the throttle channel may be bad on the RX/TX. Easiest way to test for this is to swap the servo and the ESC in the receiver; meaning put the servo in the throttle channel and put the ESC in the steering channel. Power up the ESC as normal and see if the throttle trigger controls the servo. If it does, then the throttle channel is working properly and the problem is probably with the ESC; if it does not, then you have yourself a radio problem and you can dig into it from there. If the speed controller continues to have the same issue in the steering channel, then it may be a problem with the speed controller. It could be an issue with the orange wire on the ESC's receiver lead; if this were the case though, I would expect you would have troubles using the Castle Link. Trying a completely different radio system (transmitter, receiver and servo) is another way to eliminate the radio as a culprit.

If none of the above methods resolve the problem, then the only solution would be to get the controller sent in for repair. Please let us know how the testing goes and we'll see how it works out. Let me know if you have any questions or concerns.

Thomas Porfert
Castle Tech Support