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Causes and treatment of the doorbell of the building intercom host not ringing
There are three reasons why the doorbell of the building intercom host does not ring.
The button is broken.
The button is broken (press the elevator directly).
The ringing line is broken.
Your ringing line is broken.
The phone is out of order.
Your phone is out of order.
Don't fix it yourself
According to the above three aspects, it is recommended not to repair personally, but to call a professional to repair.
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