Originally Posted by
Randy_Pike
Led's 12 67 means the RS can't read a phase. This can be caused by the ABC motor wires, an open/shorted phase in the motor, or possibly something wrong internally with the esc.
Also on 1s there is one more possible cause. Insufficient BEC/Booster/Rx pack supply voltage.
It could also mean you're dumb, which is what happened in my case. I had it set for brushed mode.