Why can I see the caller on my intercom but not hear them?

This points towards the speaker or microphone at the outdoor panel, or occasionally an audio setting on an app-linked handset, rather than a general fault, since the video connection is clearly still working correctly.

Why does pressing my flat number ring someone else's phone?

This is almost always a call routing setup issue on the panel's directory rather than a hardware fault, and is common after a change of resident where the mapping between flat number and handset was not updated.

Could my home internet be the reason my intercom app has stopped working?

Yes, if your intercom sends calls over IP to an app, a router restart, an internet outage, or a change of broadband provider can all interrupt that connection even though the physical panel and cabling are completely fine.

Is a blank screen on the indoor monitor always a broken camera?

Not necessarily. A blank indoor screen can also be caused by a fault in the cable run, the monitor itself, or a network issue on IP systems, so it is worth checking these before assuming the outdoor camera has failed.

Why has the picture quality got worse over the last few months?

A gradual decline often points towards condensation building up inside the outdoor panel, a weakening cable connection, or outdated firmware, rather than a sudden single fault, and is worth having checked before it fails completely.

Can I update the call directory myself?

On some systems residents or building managers can update the directory through an admin app or portal, but on others this needs specialist access, so it is worth checking what level of access you have before attempting changes.

Should I worry about water getting into the outdoor panel?

Yes, this can cause both immediate faults and gradual long-term damage to the camera and audio components, so any sign of condensation or a damaged housing seal is worth having inspected sooner rather than later.

Why does the fault only happen in bad weather?

Weather-linked faults often point towards a compromised seal on the outdoor panel or a cable joint exposed to the elements, both of which tend to worsen gradually until the intercom needs proper attention.

Intercom Not Working in a Flat: No Audio, No Picture

Three different symptoms with three different likely causes

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If the intercom is not working in your flat but neighbours' handsets are fine, the fault is most likely your handset, its wiring or its programmed address. If all neighbours have lost audio or picture at once, the entrance panel, power supply or shared wiring is the likely cause, and the building manager should arrange a repair.

Modern IP and video intercoms combine several separate systems working together: a camera and microphone at the panel, a network connection carrying that signal, and a handset or app displaying it. Because of that, a single symptom, such as no picture, does not automatically mean the camera is broken, and no audio does not automatically mean a speaker has failed. Each symptom has its own set of likely causes worth working through separately.

Calls reaching the wrong flat is a different kind of fault again, usually tied to how the panel is programmed to route calls rather than anything wrong with the hardware itself. This is common after a change of resident, a renumbering of flats, or work carried out on the panel by someone unfamiliar with its call routing setup.

Working through the checks below by symptom, rather than assuming the whole system needs replacing, usually narrows things down to something specific and often inexpensive to put right.

What You Will Usually Notice

The video panel rings and connects but no sound comes through in either direction

You can hear the caller clearly but the screen inside stays black or frozen

Pressing a specific flat number rings a different resident's handset or app

The picture is present but heavily pixelated, delayed, or drops out intermittently

The panel outside shows a picture is being sent but nothing appears indoors

Everything worked correctly until recently and nothing at the property has visibly changed

Safe Checks You Can Do Yourself

Test from more than one handset or the app if available

If the property has an app-linked intercom, check whether the fault shows on the app as well as the physical handset. A fault on only one device points away from the panel and towards that specific unit.

Check the router and internet connection

IP intercoms rely on a working internet connection to send video and sometimes audio between the panel and the app. Confirm other devices in the property are online, and that the router has not lost power or needs restarting.

Look at the outdoor panel for physical damage

Check the camera lens and speaker grille on the outdoor panel for cracks, condensation inside the housing, or obvious weather damage, all of which can affect picture or audio quality without stopping the call from connecting.

Confirm which flat number is actually being pressed

For a wrong-flat fault, have someone press the exact button or number for your flat and confirm which handset actually rings, since this rules out a simple case of someone pressing the wrong button by mistake.

Restart the indoor handset or monitor if it has a power switch

Some indoor monitors have their own reset or standby switch. A simple restart clears many temporary faults, particularly ones affecting picture display rather than the call connection itself.

Note whether the fault is constant or intermittent

A fault that comes and goes, especially one linked to weather or time of day, points towards a different cause than one that is completely consistent every time, which is useful detail for whoever diagnoses it.

What Normally Causes It

A network or router fault affecting an IP intercom

Because IP-based intercoms send video and often audio over the property's internet connection, a lost connection, a change of router, or an ISP outage can cause picture and sound problems that have nothing to do with the panel or handset hardware.

A failed speaker or microphone at the outdoor panel

The small speaker and microphone built into an outdoor panel are exposed to weather and vandalism and can fail independently of the camera, giving picture with no sound while everything else on the panel keeps working.

Condensation or water ingress inside the panel housing

Outdoor panels are sealed against the weather, but seals degrade over time, and moisture getting inside can affect the camera or audio circuitry gradually, often showing up first as intermittent faults before becoming permanent.

Call routing configured incorrectly on the panel

Panels serving blocks of flats hold a directory mapping flat numbers to specific handsets or app accounts. If this was set up incorrectly, or not updated after residents changed, pressing one flat's button can ring the wrong household entirely.

A resident's own handset or app not properly linked

On app-based systems, a new phone, a reinstalled app, or a change of resident's account can mean calls are being sent to a device or account nobody is checking, which looks identical to a wrong-flat fault from the caller's side.

A degraded cable run between panel and handset on wired systems

Older wired intercoms carry audio and sometimes video over dedicated cabling. A damaged, corroded, or partially cut cable along that run can cause exactly the intermittent picture or audio loss described above, even though both ends of the system test fine individually.

Firmware or software out of date on IP-based equipment

Like any networked device, IP intercom panels and apps receive occasional software updates, and skipping these for a long period can eventually cause compatibility issues that show up as dropped audio, poor picture quality or call routing glitches.

When to Stop and Call an Engineer

The fault affects every handset and the app at the same time

You can see or suspect water has got inside the outdoor panel housing

Call routing needs to be corrected for a flat or resident change

The picture or audio has been getting steadily worse over several weeks

A wired cable run needs checking or replacing between the panel and handsets

Firmware or system software needs updating on IP-based equipment

You are not confident using the app or panel's admin settings to check the directory yourself

Keeping it from coming back

Keep the resident directory updated whenever someone moves in or out, check outdoor panel seals periodically for weather damage, and make sure router and firmware updates are not being missed for long periods.

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Intercom Not Working in a Flat: No Audio, No Picture: common questions

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