Hi guys. I've recently ordered and almost finished the Emax 170 kit. It's a great little quad with quality components.
However I've been encountering problems with one of the nano 20A escs. Three escs calibrate as expected with no problem but the fourth won't calibrate. I've tried running cleanflight with oneshot enabled and all motors spin but are uncontrollable. With oneshot disabled only three motors spin.
Sometimes I get a continuous beepng noise from the esc when the motor remains still. On a couple of occasions I have calibrated the escs and the problematic esc runs the motor at full speed at zero throttle and as I centre the throttle the motor stops and then turns in the opposite direction as the throttle increases.
I've read that this could be due to an acro mode? If it is why are the other escs behaving as expected? I've built several quads and have never come across this problem before. Thanks for any help or advice you can offer