We have a S3877 Sentry safe. The battery appears dead so I can't use the code. I also have the key but since the battery is dead it is no help. What can I do?

You need to look on you tube for this. There are lots of videos on opening that safe with a rubber mallet.

You can get help here, but you will need to prove ownership... http://www.sentrysafe.com/CustomerCare/

A1 Locksmith Burlingame CA Once you get the error light that means you are entering a user code that was deleted when the batteries went dead . Simply replace the batteries then use the master code in your owners manual to open the safe. Reprogram new user code instructions bottom of this page.

The factory code combination to your electronic lock will remain in the memory of the unit - even if the batteries go dead. Any use programmed codes will be lost if the batteries lose power. The Sentry programmed factory code is always your default code.

If you do not know your factory code, you can follow this link for your combination retrieval:

http://www.sentrysafeshop.com/Lost-Combination-Sentry-Safe-Combination-p/lost%20combination.htm

A Safe and Vault Tech Will confirm that once you change the batteries the user code will erase and you will now have to enter the factory default that is in the owners manual and then use the programing instructions to program a new user code.

Use paperclip to push in pin size hole below keyboard and then slide panel to right. Battery box is right there. Replace batteries and then was already to accept code.

it sounds like the selinoid went bad or stuck this pulls the plunger down to release the handle, you might be able to take out the key pad and determine the 2 wires that go to selinoid jumper them out with a nine volt battery good luck. p.s. this could ruin your safe, be carefull. bigds keys

The door lock could be jammed try shacking briskly to losen lid and latch! akso it may have reset itself and the combo is no good no more and back to the origanal setting it had when you bought it ! ( if its a 911 you can put a screwdriver in where key goes and turn hard counter clockwise)
Good Luck!

how to change the on sentry safe s3877

I had the same problem with my Sentry S3877. I found the exact 4-battery replacement (with snap attachment on top!) at an online electronics.retailer, but had to purchase a lot of three. I don't need the other two, so I'll sell them for just $6 each to the first two folks to contact me [email protected].

Oh, by the way, once the batteries went dead, you lost your combination! When you pop the new battery compartment in, the factory default combination will be in effect. That default combination is in your user's manual. I'm currently searching frantically for mine! Gee, how could I have misplaced it ... I just had it in my hands when I purchased the safe 10 years ago !!!

Anyone know the default combo for the S3877?

---- Mark