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Locksmithing/After changing new battery CSS SG 6210 wont lock


Lock is SG 6210
It has a handle to open/close. Battery compartment is single 9V at the bottom of the key pad.

Changed the battery.
Found that the lock can be opened and closed using the handle. The keypad seems to be not engaged.

The lock is always open. The bolts move freely with the handle.

Is there any reset or do I have to redo the code etc.

Thanks for he help

Hi Monty,

I'm sure that you mean an S&G 6120 lock, as S&G didn't make a 6210 series lock.    In fact the 6200 series locks are time locks, not digital combination locks.

Based on your description, it sounds like you have a failed lock - fortunately for you it has failed in the open position and not locked.

There is no "reset" for a failed lock - it needs to be replaced.

Note:   I don't normally sell or recommend the S&G 6120 series of digital locks because of their high failure rates.     

At this point you have two options:
1.   Have a safe technician from a local safe company install a new lock.
2.   make it a DIY project and change the lock yourself.

If you have a trained safe tech change out the lock, you can pretty much use what ever lock that you would like.    If you elect to try to make it a DIY project, there is ONLY one lock that I recommend that is pretty much "plug & play".    However, please note that installation by other than a trained safe technician may void any lock warranty.

Let me know how you would like to proceed.    If necessary feel free to call me direct at:   800-326-4224


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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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