TexasCHLforum.com

I had the opposite issue with my Cannon safe. It wouldn't lock. Very inconvenient timing, too as I was on my way out the door to take my wife to her birthday dinner. I put my Shockwave in the safe and went to lock it, but the wheel just spinned freely and wouldn't catch. Since we were leaving our kids with a babysitter, having the safe unlocked was out of the question. I ended up having to transfer all my long guns and various valuables to a closet that had a lock. Among other things, this let my wife see exactly how many rifles I have (which is never a good thing).

I called Cannon and they were able to identify the lock type by the arrangement of the numbers (electronic keypad). They sent me a replacement mechanism and instructions to complete the replacement for free. I then thought, "let me change the battery first to make sure I'm not just being stupid". I was. And I have a spare locking mechanism in a box somewhere as a result.

Call Cannon. If you get a good agent on the phone, they should be able to figure out your lock type somehow.