Problems with building security door intercoms

It depends on the model and type, if it is a non-visual encoding host, it should be a problem with the extension, and it may be a problem with the host or extension when you press it directly. It is mostly visible that there is a problem with the extension or floor protector (distributor), and of course, some of your indoor lines may also have problems. If it is free of charge in the warranty.

After the insurance will need to charge, how much money is really not easy to say, generally speaking, the money of a single account is really not easy to collect, I am generally a small fault road near, deduct the cost plus 70 up and down the household, if it is far away in 140 170 households. If there is more maintenance in the community, it can generally be charged a lot less.

What is the prompt sound downstairs If the extension is not answered, it is a problem with the line, if the normal prompt sound downstairs, it means that your walkie-talkie is broken, and you can solve it by looking for the property.

First ask the neighbor's walkie-talkie if it is normal, if it can't be used, it means that the host is faulty, if it's just your family's can't be used, it means that it's your user's extension failure, no matter where the fault is, you have to find the property management to deal with it.

In fact, the line color has no practical meaning.

But the lines at both ends must correspond.

The unlocking is easy to use, which means that the unlocking cable is no problem, and there is no ringtone and no dialogue, that is, the bus and voice line are miswired (the possibility of short-term wire is very small). Black is generally a public place, and after determining the unlocking line, you can try to swap the other two lines except for the black.