The constant beeping is the ESC telling you that it is not happy with something. It will not proceed further until the fault is corrected.
1. Has the receiver bound successfully to the transmitter? Once the bind is succesful the LED in the receiver goes from flashing to constant.
2. If bound correctly is the throttle stick at minimum and possibly the throttle trim at minimum as well? As a safety feature the ESC requires a minimum low throttle signal to ensure the motor will not start when it 'arms'.
3. Is the ESC plugged into the receiver throttle channel and is the plug in the right way round?
I hope this helps.
