Try putting it into manual mode.then try retracting front or rear. Lacking that, pop the control panel out and remove and reinsert the connection plug in the back.
Vaughan & Tracy 2013 RW 36RL, 2013 F350 DRW CC, 2016 Focus. MorRyde IS, MorRyde pinbox, disc brakes, Comfort Ride Hitch. "Life is to be embraced, Grab it with both arms ! "