Master Lock Box Help
How to Change the Code on a Master Lock Box: Reset Steps
For a Master Lock box reset, call us at (805) 977-6159 if you have the current code but the reset control will not move. We come to you to check the lock box and help restore reliable access.
- Mobile locksmith service—we come to you
- Open 24 hours a day, 7 days a week
- Within 15 minutes inside San Luis Obispo
- At least a 6-month warranty on parts and labor
What You Need Before a Master Lock Box Reset
These steps cover a combination lock box with an internal sliding reset lever. Other Master Lock box designs may use a different reset control, so identify your model before changing the code.
- The current combination or key — Open the box using the combination or key you already have. The reset process starts with the box open; it is not a way to regain access when you do not know the code or have the key.
- The reset control — Look inside the open compartment for a small sliding lever. Do not force it: the lever should move only as part of the intended reset procedure.
- A new combination — Choose a code you can remember and that is not easy for someone else to guess. Keep it private, and avoid setting the code while another person can see the wheels.
- Your model’s instructions — Check the model-specific instructions before moving any control; reset mechanisms differ. Master Lock’s support page provides manuals and help for its lock boxes.
Change the Code on a Master Lock Box With a Reset Lever
Use this sequence only for a box with the sliding reset lever described here. Keep the compartment open throughout the setup and testing so you can see the wheels and reach the lever.
- Open the compartment with your current code — Set the existing combination on the number wheels, then open the compartment in the normal way. If you use a key for your model, use that key to open it.
- Find the sliding reset lever inside — With the compartment door open, look for the reset lever. Confirm that the box is open and accessible before moving it; do not try to reset the combination while the compartment is shut.
- Move the lever into its reset position — On the sliding-lever design, push the lever to the left and down. It should stay in the reset position while you set the new combination.
- Turn the wheels to your new code — Rotate each number wheel until the chosen combination lines up with the indicator. Check every wheel carefully, because one wheel set to the wrong number will keep the new combination from working.
- Return the lever to its starting position — Push the reset lever up and to the right, back to its original position. This completes the code change on this lever-style mechanism.
- Test the new code while the compartment is open — Turn the wheels away from the new combination, then dial the new code again and check that the compartment opens. Repeat the test before closing the door so a mis-set wheel does not leave you locked out.
- Close the box after the test succeeds — Once the new combination opens the compartment consistently, close the door and scramble the wheels. Store the code somewhere secure rather than writing it on or beside the box.
Need help now? (805) 977-6159
Why a Master Lock Box Code May Not Reset
Stop before forcing a wheel or reset control. A stuck mechanism can become harder to operate if you push it while it is in the wrong position.
The box is not fully open
The reset lever is inside the compartment and must be reached with the door open. Recheck that you opened the box with the current combination or key before trying to move the lever.
The wheels do not line up
A wheel that sits between numbers can prevent the new code from working. With the door still open, align each number with the indicator and test the combination again.
Your model uses a different reset control
Not all lock boxes use the sliding-lever procedure. If the control or its movement does not match these steps, use the instructions for your exact model rather than trying a different sequence.
The lever or wheels feel jammed
Do not force a control that resists normal movement. A locksmith can inspect the mechanism and help determine whether it needs adjustment or repair.
When to Call a Locksmith About a Master Lock Box
Call a professional if you have the current code or key but the box will not open, the reset lever will not move normally, or the new combination fails while the compartment is open. We provide mobile locksmith service and are open 24/7; you can contact us for help. For other Master Lock products, see our Master Lock locksmith page.
Need help now? (805) 977-6159
Frequently asked questions
Can I change the combination without opening the lock box?
No. For the sliding-lever procedure, you must open the compartment with the current combination or key before you can reach the reset control. Do not try to force the box open if you do not have working access.
Where is the reset lever on a Master Lock box?
On models that use a sliding lever, it is inside the open compartment. Its location and operation can vary by model, so compare the control with the instructions for your specific box.
How can I tell whether the new combination was set?
Keep the compartment open, turn the wheels away from the new code, then dial the new combination and test the door. If it opens, scramble the wheels and repeat the test before closing the compartment.
What should I do if the reset lever will not move?
Do not push harder or try a different reset sequence. Check that the compartment is open and that your model uses a sliding lever; if it still resists, a locksmith can inspect the box without risking further damage.
Need Help With Your Lock Box?
Call (805) 977-6159 for mobile locksmith service when the box will not open or reset.