One more try Daniel from the manual troubleshooting info on page 25
.Aircraft will not respond to throttle but responds to other controls
Throttle not at lowest position or throttle trim too high! Reset controls with throttle stick and throttle trim at lowest setting
Throttle servo travel is lower than 100%.
.Make sure throttle servo travel is 100% or greater
.Throttle channel is reversed Reverse throttle channel on transmitter
Motor disconnected from ESC Make sure motor is connected to the ESC
Ronny