Try low throttle and throttle trim all the way down, throttle hold off and Idle Up off.

Also check the transmitter throttle reverse switch position against the instructions as it may have been changed by someone fiddling with it at the LHS.

Tx on first then plug in the Rx battery (Novus instructions are incorrect).

If none of this works, take it back. This inability to link occured with my first Novus CP. Took it back and opened another...heli linked with my Tx fine and the TX in the box. Rx was bad.

Good luck.