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Locksmithing/Can't open sentry safe model CSW3910


My safe is 8 years  and just recently have been unable to open..I have the factory installed combination, the original keys and have had batteries replaced,,even though they are still good.  I have tried calling Sentry and on hold for hours.Can you help me open and or enter another code to gain access?

Hi Margie,

In general there are only three reasons a safe lock won't open - in order they are:

1.  Operator errors, incorrect dialing or operating sequence.
2.  Wrong combination or code,
3.  Mechanical or electronic problems.

If you have the correct code for your safe and are inputting them correctly and you've changed the batteries then it may be a circuit board or mechanical problem.

First recommendation - if you didn't buy brand new batteries, then replace them again and try it out.    On a regular basis I get calls on similar situations only to arrive to check the batteries and find out they were pulled out of a drawer and they are dead.    Changing batteries does NOT ensure that they are fresh and full of power.    Change them one more time.

Also ensure that they are good quality batteries.   Do not use lithium, rechargeable or cheap batteries like radio shack, Panasonic, imported or off name ones.  use Energizer or Duracell alkaline only.

If it still won't open, check to see that there is a small amount of play in the door and bolt work.   If every thing is bound up, there may be pressure on the bolt work and/or lock solenoid, keeping it from releasing.     Something caught in the edge of the door could cause enough extra pressure to keep it from unlocking.

If you have brand new batteries and the door is not bound up - if it still won't open then it is time to have it checked out by a safe tech from a local safe company.

If you have a code and it isn't working - there are no "extra" factory or secret codes to open the safe.   Generally they come with one code and when YOU change it to your code the original code is gone.   If you are still on the factory set code then there isn't another code that they can give you.    Pretty much they are going to go over the same items I've listed above and then tell you to contact a local safe company.

If you can't get it open and need a tech - check your local yellow pages under "safes & vaults".   If you don't have a local one, let me know where you are located (zip code) and I'll see who I might know and/or recommend in your area.

Sorry I don't have any magic for you, chances are this is going to be a hands on open & repair job.  


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Terry V. Andreasen (Andy)


Safe and Vault related Questions; Antique Safe Repair and Restoration; With over 42 years in the Safe & Vault industry, if I can't answer your question I know where to get the answer. Current Project: Restoration of an Ely Norris Cannonball Safe from the early 1900's. Will answer Safe & Vault related questions concerning age, value, restoration, moving, opening & repairing, parts, operation and history. Note: It is not my intention to teach you to open safes or to provide information which may aid in the unlawful opening of a safe. I will not give out drill points or information which I deem inappropriate.


44 years in the Safe & Vault Industry. Owner and Service Manager for one of the largest Safe & Vault companies on the West Coast. Graduate of Lockmasters Safe Lock Servicing, Safe lock Manipulation and Safe Deposit Lock Courses. Graduate of Locksmith Institute. Certified Instructor for the California Locksmith Association teaching Basic and Advanced Lock Servicing, Basic Safe opening and Repairing. Factory Trained by AMSEC, LORD Safes, LeFebure, Mosler, KabaMas, LaGard and Sargent & Greenleaf Author of "The Coffee Table Guide to Antique Safes".

SafeCrackers International and the National Antique Safe Association Safe & Vault Technicians Association (SAVTA)

The Coffee Table Guide to Antique Safes

Graduate of Locksmith Institute 1972 Graduate Lockmasters Safe Lock Servicing 1974 Graduate Lockmasters Safe Lock Manipulation 1975 Graduate Lockmasters Safe Deposit Lock Servicing 1985 Instructor Certified - California Locksmith Association - 1985 Factory trained by AMSEC, MAJOR, STAR, Johnson-Pacific, Kaba-MAS, Allied-Gary, ISM, Lord, Brown Safe, EXL, Mosler, Diebold.

Awards and Honors
2009 - 2015 - Listed in AllExperts Top 50 Experts. All Expert Categories - Safes & Security Containers, Locksmithing, Antique Safes. Retired US Army Chief Warrant Officer (CW4), with 39 years of total service. With numerous awards from Vietnam, Desert Storm and Operation Iraqi Freedom. US Navy - 1971-1981 US Army Reserve 1984-2013 US Army Retired

Past/Present Clients
US Secret Service, FBI, BATF, Local Law enforcment agencies, Diebold, Hamilton Pacific, Red Hawk Int., Chubb International, Bank of America, Wells Fargo Bank, Mechanics Bank, El Dorado Savings Bank, many Credit unions and smaller banks. McDonalds, Togos, BurgerKing, TacoBell, Carls Jr. FoodMaxx, SaveMart, Lucky's, Albertson's, Raley's, Safeway, NobHill, Bell Markets, PW Markets. Great America, Century Theatres, Cinemark Theatres, UA Cinemas, and many homeowners and small businesses. Provide warranty service for lock and safe manufactures. Service Area is Northern California (Fresno to Oregon and Western Nevada)

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