Question about Sentry Large Security Safe - Safe - X105

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I have a sentry safe s3877 i know the combanation but we only have one key and we locked it inside the safe by mistake

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To order replacement keys, for small chests and files, you will need to know the key numbers which can be found right around where the key goes in. It should be a stamped number, letters, or both located around the keyhole. For Personal, Home and Home/Office Safes, you will need the model number and serial number. I think that the most economical place to buy keys is from www.SentrySafeShop.com. You can do a search for "lost keys" and it will give you a screen where you can enter your model number and key number. (It is a very easy screen to use. They just need 1.)Model # and 2.)Serial or Key #.)

In Summary:
For Small Chests or Files: A lock reference number is required. It will be a letter, a number, a letter and number, or "blank" (no letter or number), engraved/located on the silver cylinder of the lock. These are model numbers 0500, 1100, 1170, etc...

For Personal, Home and Home/Office Safes: (model numbers will begin with: S0, S3, S4, S5; I0, I3, I4, I5; A3, A4, A5; J3, J4, J5; L0, L3, ,CS,CSW,DA,DS,KS,KSW,MS,MSW,OA,OS,and SC): Indicate your model number and the safe serial number found on the front right-hand side of the door, between the hinges.
Here is the direct link to the key replacement screen: http://www.sentrysafeshop.com/Keys-Sentry-Safe-Replacement-Keys-p/keys.htm

Posted on Mar 15, 2011

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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

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the only way into my 5073 model was to drill a small hole 4 inches up and 10 inches from the right edge. then curve a small wire round the size of a fifty cent piece. Inside the safe is a spring loaded lock that this will depress. Presto-

After having done that, the will be inside.

The key is located under the round medallion on the front. It pops off and a round style key fits in there. If it is a brinks, they will send you one.

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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

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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

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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.

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Lost key sentry model 1170, where can I get a duplicate key?.


A locksmith can fit keys the the sentry safe 1170. Sentry safe lost key replacement is availble. You do need to know the key # that is on the face of the lock to cut a 1170 key by code.

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Sentry safe S3877 have key and know combination but battery dead


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.

Apr 08, 2009 | Sentry Fireproof Safe

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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

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Changing the code on my Sentry Safe S3877


how to change the on sentry safe s3877

Sep 29, 2008 | Sentry Fireproof Safe

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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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