How to use ab key of security door?

After getting the house, the owner will get the key to the gate. Generally speaking, there are two keys, A and B, and the property management will explain the specific distinction and use of these two keys. For example, it will show that key A is used for house decoration and key B is used by the owner after decoration. After the house decoration is completed and the owner has passed the acceptance, the house should take back the key A in time, then insert the key B into the lock cylinder and turn it once or in the opposite direction, and the key A will automatically become invalid.

In other words, don't use the B key to open the door until the renovation is finished. Once you open the door with the B key, the function of the A key will be invalid, which will inevitably bring some trouble to the subsequent decoration and occupancy.

Ab key b key does not turn:

1, the first thing to check is that two of the keys A and B are misused, because when the key B is misused, the key A will automatically fail, and when the two keys are misused, it will result in immobility.

Secondly, the key may be in the wrong position, because sometimes the lock core will be misplaced. At this time, you can hold the keyhole with one hand and turn the key with the other.

3. In another case, the marbles in the lock core are rough, and the keys and marbles will get stuck together. At this time, the universal lubricating rust remover can be sprayed into the lock hole to lubricate the lock rail, and then the key can be inserted to move the rotating key.