I have an ender 3 s1 plus, that i bought second hand stating he couldnt calibrate the printer. He had it set on 230 and never changed it to 115. The bed moves back like it is suppose to but doesnt stop. I replaced the limit switch, same issue. Replaced the main board thinking he messed up the board but now instead of moving away from me towards the back of the printer it moves forward towards me and will not stop. Please help! I am at a loss of what to try next.