Weiser door locks are manufactured by the Weiser Hardware Company, which produces both residential and commercial door hardware. Many of the residential locks produced by Weiser are designed to be easily installed by DIY homeowners. This allows homeowners to remove and replace the lock themselves if the unit is damaged, or if they simply want to update the look of the door. When changing a Weiser lock, it is helpful to look for a model that will fit into the existing holes in your door. This will avoid the need for new holes and make installation even easier.
Examine your Weiser lock. You will see a pair of screws on the interior side of the door, typically at either edge of the trim. Use a screwdriver to remove these screws to unfasten the lock from the door.
Open the door and remove the screws along the edge. There should be two or four screws holding the latch plate in place. Once you remove these screws, pull the latch plate off of the door by hand.
Grasp one knob or lever in each hand and pull each away from the door. With all the screws removed, the lock and trim should pull away easily.
Purchase your new Weiser lock. Look for a unit that is the same style as your old one. Knobs and levers are typically interchangeable when it comes to door preparations and installation. These types of locks are not typically interchangeable with deadbolts or handlesets, however. If you switch to a new form of lock, you will need to bore additional holes in your door for installation.
Insert the exterior (keyed) side of the lock through the exterior side of your door. Line up the connecting rods and cylinder tailpiece to insert the interior trim. Hold these two units in place, then insert screws into the interior side of the lock to fasten it to the door. Check that the lock works with the existing strike and also that the finish is complementary. If you need to replace the strike, simply unscrew the old unit from the frame and screw the new one in its place.
Remove all screws from the interior side of the door. You will typically see two screws near the lever or knob and two more near the deadbolt thumbturn.
Open the door to access the latch plates. Remove the screws holding the latch plate in place around the handle as well as though at the plate surrounding the deadbolt. After all four of these screws are removed, take the latch plates off the door.
Check the exterior side of the door. There will likely be a single screw holding the base of the door handle. Remove this screw, then pull both the handleset and deadbolt trim away from the door.
Choose your new Weiser lock. If you are replacing a handleset, it's important to choose another handleset that is similar. For example, if your lock has a deadbolt, the new lock should have one too. If you choose a different form of lock, you will have to find a way to fill the bore holes in your door. This can be difficult to do well and can impact the appearance of your door.
Insert each half of the deadbolt into the top bore hole. Line up the connecting rods so that you can hold each half tight to the door, then screw the deadbolt in place from the interior side of the door.
Place both halves of the latch unit into the lower bore hole so that the handle faces toward the exterior. Screw these units in place from the interior side of the door. Fasten the base of the handle from the exterior side of the door, then add a plug or cover to conceal this fastener from the inside of the home (if one is provided).
Attach both latch plates to the edge of the door. Check to see whether the lock functions with the existing strikes. If not, replace the old strikes with the ones that came with your new lock. Make sure to use the smaller deadbolt strike as the top strike and the larger latch strike as the bottom unit.