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I lost the combination to the S3877 - Sentry Fireproof Safe

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Goto SentrySafe.com and request a combination to be send to you.
you need the model and the serial number from the box.

Posted on Nov 25, 2008

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Posted on Jan 02, 2017

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We have a Sentry safe S3877, I believe the battery is dead and we can't open the safe. So how do we get to open and replace the batteries?


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

Nov 27, 2017 | Sentry Home Security

1 Answer

How do I open a sentry s3877 safe when the battery is dead and safe is closed


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

Sep 23, 2012 | Sentry Fireproof Safe

1 Answer

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?


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

Dec 07, 2010 | Sentry Fireproof Safe

1 Answer

Somehow can open my sentry s3877 with the keypad.


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.

Jan 07, 2010 | Sentry Fireproof Safe

1 Answer

My combination to s3877 works, but key button is pressed by accident and I can't find the keys to unpop it. How do I get it open. Light turns green after inputting the code, but level is unmovable.


You will need to contact customer service (either in the UK or US) for the replacement keys - without the keys you can't get into the safe. The key barrel is a secondary lock and needs to be unlocked before you can use the digital or dial combination.

Dec 14, 2009 | Sentry Fireproof Safe

2 Answers

Safe SENTRY S3877 can not open the door


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!

Jan 02, 2009 | Sentry Fireproof Safe

2 Answers

Changing the code on my Sentry Safe S3877


how to change the on sentry safe s3877

Sep 29, 2008 | Sentry Fireproof Safe

2 Answers

Sentry s3877 battery compartment broke


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 mark@irregardless.net.

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

Sep 15, 2008 | Sentry Fireproof Safe

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