Make sure that the servos are plugged in correctly, the black wire should be at the top edge of the receiver case when the servo is plugged in. Do the servos make a little twitch when you turn the switch off and on on the receiver battery? If so, they are plugged in correctly. Are you using the switch that came with the transmitter/charger package? If not, make sure that the black wire on the switch wiring to the receiver is also at the top of the receiver case. So far, my only complaint of the Airtronics 2.4GHz receiver is that the connection to the servos are not very accommodating of some of the brands of servos connectors, especially Futaba as you not only have to shave off the little tab but thin them down a bit and perhaps chamfer two corners.