Why has one of my CCTV cameras gone offline?
A practical walkthrough for homeowners with a single dropped camera
A camera going offline is one of the more confusing CCTV faults because the rest of the system usually keeps working fine, which rules out a broadband or recorder problem straight away. Nine times out of ten the issue sits somewhere between the camera itself and the switch or injector feeding it power over the same cable, rather than anywhere near your router.
This guide is written for homeowners with a PoE (Power over Ethernet) or UniFi style system where cameras connect back to a recorder or switch by cable, since that is the setup where a single camera can drop while everything else stays online. If your cameras are WiFi only and the whole system disappears at once, that is a different fault and worth reading alongside our guide on cctv dropping off the wifi.
We will take you through the checks an engineer would do first: confirming power at the injector, checking the physical cable and connector, looking for an IP address clash, and understanding the difference between what your phone app shows and what the recorder itself is actually seeing. Most single camera dropouts are fixable in ten minutes without tools.
What You Will Usually Notice
- One camera shows offline, grey or no signal in the app while others work
- The recorder lists the camera as disconnected but it was fine yesterday
- The camera image freezes on a last frame rather than updating
- The camera works on the local network but not remotely, or the other way round
- The PoE injector or switch port light for that camera is off or flickering
What Normally Causes It
Faulty PoE injector or switch port
PoE ports carry both data and power and can fail electrically without any visible sign, which cuts the camera off completely while neighbouring ports keep working.
Cable damage or a failed connector
Cat6 cable run externally, through lofts or near rodent activity is prone to nicks, crushing or corroded connectors that cause an intermittent or total loss of signal.
IP address conflict
If the camera loses its assigned IP address, for example after a router reset, the recorder can no longer find it on the network even though the camera itself is powered and working.
Camera firmware or hardware fault
Older cameras occasionally lock up internally and need a power cycle, and in some cases the image sensor or network chip inside the unit has genuinely failed.
App versus local viewing confusion
Remote viewing apps rely on your broadband and the manufacturer's cloud service, so a camera can appear offline in the app while it is perfectly healthy on the local system.
Before You Book: Common Questions
Why has one of my CCTV cameras gone offline?: common questions
Camera stuck offline?
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Safe Checks You Can Do Yourself
Check the app against the local screen
Log into the recorder directly on a monitor or via its local network address before trusting the phone app, since app connections can drop for reasons unrelated to the camera itself.
Look at the PoE injector or switch port light
Each PoE port usually has a small status light. If it is off where the others are lit, the port or injector supplying that camera has likely failed or lost power.
Reseat the cable at both ends
Unplug and firmly replug the network cable at the camera and at the switch or injector, checking for a bent or dislodged connector pin.
Swap the camera to a different switch port
If you have a spare PoE port, move the cable across. If the camera then comes back online, the original port or injector channel is at fault, not the camera.
Restart the switch or NVR, not just the camera
Power cycle the recorder or PoE switch from the mains, wait thirty seconds, and let it fully reboot before checking the camera list again.
Check for an IP address conflict
In the recorder's network settings, confirm the camera still has the IP address it is expecting. A router reboot or new device joining the network can occasionally hand that address to something else.
Inspect the cable run for damage
Where the cable passes through a wall, soffit or has been recently disturbed by other work, check for visible crushing, kinks or rodent damage along its length.
When to Stop and Call an Engineer
Keeping it from coming back
Keep PoE injectors and switches somewhere dry and ventilated, since heat and damp shorten their working life considerably. Have external cable runs and connectors checked at your next CCTV service so damage is caught before a camera actually drops offline.
Next Guides in This Series
- How do I reset my CCTV DVR or NVR properly?
- Burglar Alarm Installation Cost: 2026 UK Price Guide
- Weighing up 868MHz wireless kits against cabled zones for period homes, extensions and new builds
- How Many CCTV Cameras Does Your Business Premises Need
- How Often Should Alarms and CCTV Be Serviced for Business
- Common causes of unexplained alarm activations and what you can check yourself
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