What Could be Wrong With My Overhead Garage Door?
Replace the sensors as they were before and check that they work. Presumably the door is badly balanced, so that the weight requires less force or energy for openning than for closing. If so then it may be a help to reduce the amout of this weight until the motion in both directions needs about the same effort from the motor. Also check the mechanical joints for too much friction or resistance to this motion, at the same time as you look at the balancing. Lubricate with grease, oil will run out. Check that the motor is not overheating when at present the button is held down, to close the door. Possibly it has become partly damaged and needs a chance to dry out or more seriously to be replaced. If it has brushes, examine them for sparking and for wear and replace them.
