- Four left, three right, two left, then right to open. Skipping a revolution leaves a wheel unpicked.
- A dead battery never erases an electronic combination. It only stops the motor.
- Repeated wrong entries trigger a penalty lockout that gets longer if you keep trying.
- A key override is often the weakest part of a consumer safe. Store the key elsewhere.
Mechanical combination locks
Behind the dial sits a stack of wheels, usually three, each with a notch called a gate. Dialing the combination rotates each wheel until its gate lines up. When all gates align they form a slot, the fence on the lever drops into it, and the bolt can retract.
Dialling direction and the number of revolutions matter because each wheel is picked up by the one before it. That is why the standard procedure is four turns left to the first number, three right to the second, two left to the third, then right until the bolt retracts. Skipping a revolution leaves a wheel unpicked.
The most common service call is not a broken lock. It is a customer dialing past a number and continuing rather than starting over. Talk them through a clean redial before you dispatch. It resolves a surprising share of calls at no cost to anybody.
Electronic safe locks
An electronic lock stores the combination in non volatile memory, so a dead battery loses the time of day but never the combination. When a customer says the battery died and it wiped my code, the code is still there. The battery simply cannot drive the bolt motor.
Most units live on one nine volt battery in the keypad housing or in a tray below it. Replace it with a fresh alkaline, not a rechargeable and not a lithium unless the manufacturer specifies one, because the voltage curve matters to the motor drive.
Electronic locks also have a penalty lockout. Several wrong entries in a row trigger a delay of several minutes, and continuing to try extends it. Tell the customer to stop pressing and wait. Half of all electronic safe callouts are somebody fighting a penalty timer.
Redundant keys and key override
Many consumer safes include a key override so the safe can be opened without the combination. That is a convenience and a vulnerability at the same time, because the override cylinder is often a low grade tubular or wafer lock that is far easier to attack than the electronic lock beside it.
Commercial rated safes generally do not have an override, which is why losing a combination on one is a serious event requiring manipulation or drilling.
Advise customers to store override keys away from the safe, and to record the combination somewhere secure and offsite. The number of safes drilled every year because the only record was inside the safe is not small.
Common Questions
Mechanical dial or electronic keypad?
A dial needs no battery and lasts decades. A keypad is faster, records nothing on most units, and dies when the battery does. Both are fine. Neither is an upgrade over the other.
My keypad is dead. Is the safe stuck shut?
Usually not. Most keypads take an external battery contact or a fresh battery in the pad itself. Try that before calling, and never drill on the guess that the lock has failed.
Can a safe lock be rekeyed like a door lock?
A dial combination can be changed with the change key through the back of the door while it is open. An electronic lock takes a programming sequence. Neither should be attempted with the door shut.
Rather hire someone for this?
The directory lists safe locksmith businesses by city, each with a phone number and its public reviews.
Find a safe locksmithWhat the specialist badge means