FlySky GT2 2.4 has no steering
 

So I had thought my system was working just fine but apparently I have no steering controls, when I turn the TX on the servo twitches to center but turning the wheel does not translate to any movement on the car itself.

Rebinding doesn't seem to make a difference and this occurs on both of my RX units so I am wondering if it is an issue with the handset itself.

Anyone got any hints / tips or suggestions?