Which product are you buying? What model? These are very important. If it is not out of warranty, you directly find the manufacturer after-sales engineers to repair, forget the contact information you can find the property management company to assist in dealing with this matter. If you can not first please test the unlocking line is connected at both ends, and then use the multimeter at the lock end of the test, in the unlocking, whether there is more than 300 milliamps of instantaneous current through the unlocking line (there is, indicating that the host and the unlocking line is normal, it is estimated to be the damage of the electric lock, please replace the electric lock to test; such as no, and then will be the multimeter in the host of the unlocking end of the test, such as when there is a, then unlocking line failure, there is no indication that the host faults)?
The whole unit occupants can not unlock, but can be password or card unlocking: it is estimated that the trunk line short-circuit or a floor platform damage caused by the first check the wiring ports of the main line, such as wiring is normal, then from the first floor of the floor platform in order to start up to test the floor platform (test the floor platform: disconnect the upper floor of the trunk line, test the current layer, such as normal regardless of the normal, such as not normal, please replace the floor) platform and try again, until the test is normal (such as new installations like debugging), by analogy). Still not work then. You call 4-00-608-7-44-7.