Master Lock 5400D Key Storage Combination Lock box i reset it combination a couple of days ago and it worked fine until today. Now it won't open with the new combination. How can I get in to it without destroying the lock box?

To set a new combination:
The initial combination is set at the
factory to 0-0-0-0
1. Open the compartment door
2. Push the reset lever left and down.
The lever remains in this position
3. Rotate dials to your desired combination
4. Push the reset lever, up and right, back
to the original position
5. Close the key storage compartment door
6. Scramble the combination dials to lock
the door and conceal your combination
7. Close the shutter door

Open the lock with the existing combination. Inside the flap, you'll see a small chrome lever. Push the lever to the left (as you're looking into the box) and **** it up into the offset slot. This puts the lock into the "learn" mode. Select your new combination and rotate each wheel until the numbers line up at the opening index. Flip the lever out of the "learn" position, and back into the "home" position.

Test your new combination several times, before closing the door.

No joke... trial and error... its not going to be fun, but work out a system so you don't cover the same number twice.

your answer is on this site
http://www.masterlock.com/faq/lostcombo.shtml

nokia6708

how do i get the box open . the box is 5400D portable key storage i'm a realtor

If you have the change key, you can insert into the lock and make a new combination. Only the Change Key witll allow you to change combination.
Artgirl

Instructions:
Opening the key storage
compartment door
1. Open shutter door to reveal the dials
and the release button
2. Rotate dials to the current combination
(if the lock is new, the combination is set
at the factory to 0-0-0-0)
3. Press down on the release button
to open the door
4. Pull the door fully open
5. Add or remove keys
6. Close compartment door
7. Scramble the combination dials to lock
the door and conceal your combination (A)
8. Close the shutter door (B)
To set a new combination:
The initial combination is set at the
factory to 0-0-0-0
1. Open the compartment door
(see instructions above)
2. Push the reset lever left and down.
The lever remains in this position
3. Rotate dials to your desired combination
4. Push the reset lever, up and right, back
to the original position
5. Close the key storage compartment door
6. Scramble the combination dials to lock
the door and conceal your combination (A)
7. Close the shutter door (B)
To hang shackle model
1. Open the compartment door
(see instructions above)
2. Push the shackle release lever to the left
to open shackle
3. Pull the shackle up and out of the lock
4. Place shackle around door knob or other object
5. Close shackle to lock
6. Close the compartment door
7. Scramble the combination dials to lock
the door and conceal your combination (A)
8. Close the shutter door (B)
Reminder:
(A) The release button will open the lock
until you scramble the dials
(B) Keep the shutter door closed to increase
weather resistance and to conceal the
dials from view

Master lock offer a free replacement service for locks which develop a mechanical defect during normal use.
See their website here for further information -

http://www.masterlock.com/customerservice/

If the lock has been forced or tampered with to cause this problem, then a replacement is needed.

Hope this helps

Have 5400D Master Lock. Know combination, but it will not open. Can someone help me?