Some of the most common door installation problems and their corresponding fixes include: - The door doesn't close all the way or sticks when closing: This is often caused by a misaligned threshold, which can be easily fixed by adjusting the screws on the bracket that holds the threshold in place. - The doorknob falls off: This is usually caused by a loose screw, which can be tightened with a Phillips head screwdriver. - The door won't open from the outside: This is usually due to a lack of clearance between the door and frame, which can be solved by installing a strike plate with an added lip. - There's a draft coming through the bottom of the door.

Installation problems can occur when the door frame is not square or the threshold is out of level. Other problems may include poor installation of the hinges, screws not being tight enough, or a poorly fitted door. Here are some tips for fixing common door installation problems: -If the door frame is not square, use a carpenter's level to correct it before installing the door. -If the threshold is out of level, use shims to adjust it before installing the door. -Make sure that all screws are tight, and that the hinges are properly installed. -Check to see if the door fits properly in the frame; if it does not, make adjustments until it does.