I have a craftsman half horsepower garage door opener and the door will not shut unless I hold the button in the whole time do do I fix the problem?
Does your garage door have a sensor that prevents the door from lowering if an obstacle is in the path of the sensor? If the sensor (usually a light beam) detects something in the path, the door will ask as you describe. Clean the sensor removing any debris or moisture from the sensor and try your door again. Sometimes extreme sunlight at the right angle can cause the sensor to read a false positive too.