How to Change a Combination Door Lock? | Reset Codes By Lock Type

For the full breakdown, see our best Combination Door Lock guide.

Whether you own a mechanical dial lock, a push-button unit, or an electronic keypad, the process always follows the same core rule: the lock must be open and set to its current combination before you can change anything. The exact steps differ by lock type, so here is how to handle each one, starting with the most common mechanical designs and ending with electronic keypads.

How to Change a Mechanical Dial Combination Lock

Mechanical dial locks use either a change key or a reset tool, depending on the model. For 3-wheel key-changing door locks, you will need the small changing key that came with the unit. Dial the current combination, insert the key fully, and turn it from the IN position to the changing area.

Once the key is turned, dial the new combination on the wheels, then turn the key to OUT and remove it. The manufacturer warns that you must test the new code several times before closing the door. A common failure point is an incompletely inserted key—it will not turn unless it is fully seated.

Push-Button and Padlock-Style Combination Locks

Mechanical push-button locks vary by manufacturer, but the general pattern holds: you enter a programming sequence, clear the old code, then set a new one with the door open. One common sequence uses a programming key like “7” + “4” + “*” to enter code-changing mode, then the old combination and a confirm key before entering the new code.

Electronic and Keypad Door Locks

Electronic locks depend on the brand, but the common thread is confirming the new code before finishing. Most require entering the existing code or a programming code, then following a button sequence and confirming the new passcode. Lowe’s guide says to confirm with the “Lock” button and test the new code. Eufy locks use the app over Bluetooth to sync a new passcode.

Before buying a new lock, check our tested lineup of the best combination door locks to see which models offer the easiest reset procedures.

Common Mistakes That Break a Lock Reset

Three mistakes cause most failed resets. First, using the wrong current combination—the lock will not reset unless it is already set to the correct code. Second, not fully inserting a change key or not fully depressing push-buttons. Third, failing to clear the dial after changing, which leaves the lock mis-set.