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Check to make sure that your throttle is all the way down, and your throttle trim is also all the way down. If you try to start out in idle up, (the switch is set to idle up), it won't arm. Also be sure that your crystal is fully seated in both your transmitter and receiver. If the receiver does not get a signal it won't arm.
Hope these three things help you solve your problem.
Trex 600,Gazaur Mars 480, Trex SE V2, ESky 550 ESmart, Eco 8 Royal, Dragnous II, Falcon 3D, SE,