If the receiver led was red and the right stick was working ,perhaps the throttle channel (channel 3) is reversed and the transmitter gives full throttle, althought the throttle stick is in lowest position. In that case, the 4 in1 unit does not give power to the motor ,for safety reasons and the receiver led gets red. There are four switches on your transmitter face, one for each channel, that allow you to set the direction of each channel. Change the direction of channel 3 and try again.
I think the manual should give you the direction of each channel (normal or reversed). Also the led gets red or flushes red, every time the receiver does not receive signal from the transmitter but as the right stick works, this is not the case.




Kostas from Athens.