My quad will not fly
https://reddit.com/link/1tgpfcm/video/v6uao2u7vw1h1/player
When I throttle up, only motors 1, 2 and 4 spin up. Motor 3 does not accelerate.
When I change the Yaw, roll or pitch, all the motors seem to respond as they should.
Please help.... thankyou.