What is this?
Door intercoms and entry systems allow you to speak with visitors and remotely release a door lock or gate. They range from simple audio buzzers common in flats to video door entry systems. When they fail, you may not be able to hear visitors, see them on camera, or release the door remotely.
Common causes
- Internal handset or monitor not receiving power
- Wiring fault between the external panel and internal unit
- Door release mechanism jammed or failed
- External panel damaged by weather
- Flat wiring disconnect in communal systems
- Power supply unit failure
Is it dangerous?
A non-working intercom is not an electrical safety risk. However, if it controls access to a communal entrance, other residents may also be affected. In some cases, the door release may fail in the open position, creating a security concern.
Can I fix it myself?
Check that the internal handset is properly on its cradle or connected. For systems with a plug-in power supply, check the power adapter is plugged in and working — try a different socket. In communal systems, check with neighbours to see if the issue affects everyone or just your flat. Check for a fuse or reset button on the system.
When to call an electrician
Call an electrician if the intercom has no power and you have checked the supply, if you can hear but the door release does not work, if the system has a video screen that shows no picture, or if the external panel appears damaged.
What will an electrician do?
Test the power supply to the intercom system
Check wiring between the external panel, internal unit, and door release
Test the door release mechanism (electric lock or maglock)
Replace faulty handsets, panels, or power supplies
Repair or replace the door release mechanism
Typical cost
£60 – £250
Simple handset or power supply replacements are at the lower end. Door release mechanism replacement or rewiring communal systems costs more. In communal buildings, costs may be shared between residents or borne by the freeholder.
