A door that closes partway and reverses usually means the opener thinks something is in the way. The first thing to check is the pair of safety sensors near the floor: wipe both lenses, look for a bent bracket and confirm each indicator light is steady. If the sensors are fine, the force or travel setting may have drifted, or the door may be out of balance because of a tired spring. Pushing the opener harder to compensate makes things worse, so we check the door by hand before touching settings.
