Safe won't open? Dead battery, lost code or a lock fault

Why are batteries the first thing to check?

Because they're the usual cause. SentrySafe's own support page says "most digital lock problems are related to low, dead or Non-Alkaline batteries" (SentrySafe). A tired battery can light the keypad and beep, then fail to drive the bolt, which looks exactly like a wrong code.

SentrySafe's battery advice:

• Use alkaline batteries from a reputable brand, not rechargeables or non-alkaline cells.
• Check the expiry date.
• Don't mix brands, or old and new batteries.

A safe kept in a cold garage, a detached shed or an unheated cottage over a Manitoba winter will drain its batteries faster, because batteries deliver less power in the cold. If your safe lives somewhere chilly, change the batteries every fall.

Where does the battery hide?

It depends on the model, and some are hidden on purpose. On SentrySafe models, the battery may be:

• behind a cover just below the keypad
• in a drawer on the side of the electronic lock
• behind the keypad itself, which turns and lifts off
• inside the door, so you can't reach it with the safe closed

If your battery is inside the door, look for a backup. SentrySafe lists some models with a 9-volt "battery auxiliary override" or a 9-volt slot on the outside, which powers the lock long enough to enter your code. The maker notes this shouldn't be used as a primary way of getting into the safe. Check your model number against SentrySafe's battery page or your manual.

What about the override key and lockout delays?

The override key. Many electronic home safes have a mechanical override lock, often hidden behind a small cover or badge on the front. The key opens the safe with no power and no code. The catch: people store the key inside the safe. If yours is somewhere else, now's the time to use it, then put fresh batteries in straight away.

The lockout delay. Many electronic safe locks stop accepting codes for a while after several wrong entries, as a security feature. Pressing more buttons during the delay can keep it going. If you've tried a few codes, leave it alone for a while, then enter the right code once, slowly and carefully. Your manual says how long your model waits.

What if I've lost the combination?

Go to the maker first. They can usually look up or reset the combination from the safe's serial number, once you've proved it's yours.

1. Find the model and serial number. They're usually on a label or stamped on the safe body; your manual or the maker's site shows where.
2. Contact the maker. SentrySafe's Canadian replacement service asks for the model and serial number and verifies your identity before releasing a combination (SentrySafe Canada).
3. Be patient. It isn't instant, which is part of the protection.

The identity check is there for a good reason. A safe holds passports, deeds, jewellery and sometimes firearms. A maker or a locksmith that would open one for anyone wouldn't be much use to you.

If you inherited the safe or bought a house with one left behind, you may not have the paperwork. Gather what you can: the deed or estate papers, and photo ID. A safe technician will also ask for proof that you have the right to open it.

When should I call a safe technician?

When the simple checks haven't worked, or the maker can't help. Call if:

• fresh batteries, the override key and a patient retry haven't worked
• the keypad is dead even with new batteries, or shows an error
• the handle turns but the bolt won't retract, or the dial spins freely
• the code is lost, there's no override key, and the maker route isn't possible
• the safe has been attacked, after a break-in, and the lock is damaged

A safe technician can usually open a home safe without destroying it, then reset the lock or fit a new one. Higher-security safes can take more work, and the technician should explain the options before starting. Our safe opening and service page explains how we handle it, including the proof of ownership we ask for.

What if the safe was tampered with in a break-in?

Don't keep trying codes on a damaged keypad. Photograph the safe for your police report and insurance, then have the lock looked at. Our guide on what to do after a break in covers the rest of that day, including the doors and locks. If keys or codes went missing too, read should I change locks after losing keys.

How do I stop this happening again?

• Change the batteries every year, on the same date you check your smoke alarms.
• Store the override key outside the safe, somewhere secure that someone you trust knows about.
• Write the combination down and keep it in a separate safe place, such as with your will or a trusted person.
• Record the model and serial number now, with a photo, while the door is open.

The short version

• Fresh alkaline batteries first.
• Then the override key, and wait out any lockout delay.
• Lost code: the maker can help, after proving ownership.
• Still stuck, or the lock has failed: a safe technician can usually open it without destroying the safe.