Electronics Repair Questions? Ask an Electronics Technician
Do you have a keypad or dial version?
The manual for both is here:
If you can find the manual that came with the safe then the factory code or combination will be on that...
If you don't have the manual and no code is working then filling in a form with Sentry and getting it notarised is the only way to get the factory code...
If electronic I would try changing the batteries first...