Electronics Repair Questions? Ask an Electronics Technician
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If the lock mechanism gets stuck then you will get an error.
To fix this, try hitting the safe several times just above the lock area with a rubber mallet - this will help to loosen the lock actuator and it should eventually open without giving an error.
Once you get it opened, apply some oil to the internal lock mechanism to help prevent it sticking again.
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If the lock mechanism is stuck fast and using a rubber mallet will not work to release it then you will need to have a locksmith with specialist tools release it.