12 Common CCTV Problems and How to Fix Them Fast

Estimated Reading Time: 20 minute(s)

When a commercial CCTV system stops working properly, the problem is rarely dramatic. It is usually something specific: the footage is blurry, the night vision has gone, the DVR has stopped recording, or the mobile app will not connect. Most of the time there is a fix, and some of them you can do yourself.

This guide covers the 12 most common CCTV problems we see when we visit business sites, what causes them, and what to try first. We have also flagged which problems are straightforward to resolve and which ones genuinely need a professional to look at.

If your system has persistent problems, keeps developing new faults, or is simply too old to be worth fixing, the most useful thing you can do is book a free CCTV survey. We will assess the whole system, tell you exactly what is wrong and give you an honest recommendation on repair or replacement.

12 Common CCTV Problems and How to Fix Them is our quick troubleshooting guide to help you solve your CCTV issues.

Quick links to common problems

0333 900 0101 sales@network-data-cabling.co.uk Contact us

CCTV Cameras of Today

CCTV cameras are a common and cost-effective feature of modern security systems. But a CCTV camera’s security guarantees are only as good as the camera’s reliability and the quality of the footage that it produces. Picture quality is one of the essential requirements that the Home Office lists in the UK police requirements guide. Consequently, any CCTV problems should be treated with care.

Even something as innocuous as occasional flickering can hide crucial details from a picture — like a thief’s face or a vehicle’s number plate.

Modern CCTV cameras are sturdy, operator-friendly devices, light-years ahead of the finicky and trouble-prone cameras from thirty years ago. But no matter how much effort manufacturers put into making their devices operate well without much configuration, some problems still occur.

Don’t want to deal with CCTV problems on your own? We get it! Give us a call or send us an email and our CCTV specialists in London will fix any issues in record time!

This is to be expected of any camera. You are bound to run into trouble even with high-end equipment from reputable manufacturers. Many common CCTV problems are simply a symptom of imperfect installation or incorrect configuration. Partnering with a professional CCTV installation team avoids most of them entirely.

Fortunately, some of these problems are easy to fix. Here are 12 common CCTV problems and how to fix them.

1. The Colours on My Camera Are Off

Distorted or unnatural colours are almost always a white balance issue. Cameras try to compensate for different lighting conditions automatically, but the automatic settings do not always get it right, particularly outdoors where the light changes throughout the day.

What to try: check whether your camera is set for outdoor or indoor use, as this affects how it processes colour. If the camera uses automatic white balance (sometimes labelled ATW or AWB), try angling it slightly away from the sky or nearby light sources, which often triggers a more accurate reading. If repositioning does not help, disable automatic white balance and adjust it manually.

If additional colour settings are available, such as hue or gamma adjustments, work through these until the image looks natural under different lighting conditions. Bear in mind that some cameras simply have limited colour range and will not produce accurate results in every ambient condition, which is a reason to upgrade rather than keep adjusting.

When to call a professional: if you have exhausted the settings and the footage still looks wrong, the issue may be a failing sensor.

Contact ACCL and we can assess whether the camera needs replacing.

0333 900 0101 sales@network-data-cabling.co.uk Contact us

2. I Only Get Black and White Images

A colour camera producing black and white footage is usually switching into night mode. In low ambient light, cameras that use infrared LEDs to illuminate the scene cannot distinguish colours under infrared light, so the footage becomes monochrome. This is normal behaviour for most day and night cameras.

What to try: check whether the ambient lighting is sufficient for colour output. If it is, make sure the optical path is unobstructed and inspect the camera for physical damage. If your camera has an analogue output, check that the input and output video types match. Plugging a composite signal into a component input can sometimes produce a monochrome image rather than a black screen.

If the lighting is adequate and everything appears physically intact, connect a test monitor directly to the camera output. A colour image on the test monitor confirms the camera is working and the issue is elsewhere in the system.

When to call a professional: if the camera is producing monochrome footage in good light and a test monitor confirms it is working, the fault is likely in the cabling, recorder or switching equipment.

Book a free site survey and we will trace the fault.

3. There Are Horizontal Lines on My CCTV Footage

Horizontal lines on CCTV footage can make it difficult to distinguish fine details and can make it difficult for staff to monitor areas for long periods. There are just two typical root causes: interference from ambient lighting or electrical interference. The latter can be tricky to diagnose.

Here is how you can troubleshoot these problems:

Make sure there is no electrical light that falls directly on the camera. Bright lights, and light from some types of electrical light sources, can interfere with single-chip CCD sensors and result in flickering or horizontal lines on CCTV footage.
Check the power supply for damage and, if you can do that, ensure that it has adequate power filtering. A damaged or inadequate power supply can leak interference from the electrical network into the equipment it is powering. That, in turn, interferes with the CCD sensor and can result in distortions such as horizontal lines on CCTV pictures.
Check the cables for shielding damage.
If you are using particularly long cables, Cat 5 or coaxial cables, make sure that all cables are routed correctly. Ensure that the cables are routed away from high-frequency equipment like satellite transmitters, that they are not touching any electrical equipment, and make sure that all cables are correctly grounded.

If the problem is lighting rather than electrical interference and you cannot avoid it, you can look into using a WDR (Wide Dynamic Range) camera or a CMOS sensor camera. It is a good idea to cover all other avenues before looking into additional equipment.

When to call a professional: persistent horizontal lines that survive all basic checks are usually a cabling or earthing problem. These require proper diagnostic equipment to trace.

Get in contact — this is one of the most common faults we fix on commercial sites.

4. My CCTV Video Is Flickering

Flickering is one of the more frustrating CCTV problems because it is often intermittent, which makes it harder to diagnose. The most common causes are interference, an inadequate power supply, or ageing infrared LEDs.

What to try: start by ruling out the monitor. If the flickering only appears on one screen in full-screen mode, test the monitor separately. Check connectors and cables for damage, paying particular attention to shielding. If the camera has an analogue output, disconnect the video cable at the camera output and check whether the flickering continues on the monitor. If it does, the fault is at the monitor end rather than the camera.

If the flickering only occurs at night, the most likely cause is insufficient power for the infrared LEDs. Cameras draw more power in low light conditions and PoE installations in particular often run close to their power limits. Also check that all equipment is rated for 50Hz operation, as some power supplies and PoE switches require this to be set manually.

Ageing LEDs flicker in a way that is not visible to the naked eye but shows up clearly in footage. If the camera is several years old and the flickering is getting worse, the LEDs are likely at the end of their life.

When to call a professional: if basic checks have not resolved it, persistent flickering usually points to a power supply fault, an earthing issue, or a failing camera that needs replacing.

A professional CCTV survey will identify the cause and give you a clear recommendation.

0333 900 0101 sales@network-data-cabling.co.uk Contact us

5. My CCTV Camera Footage Is Noisy or Grainy

Noise in CCTV footage is the visual static or grain that makes it hard to see fine detail. It is almost always caused by electrical or RF interference and sits in the same family of problems as flickering and horizontal lines.

What to try: check all connectors and cables for damage, particularly analogue video cables and their shielding. Ensure cables are correctly routed and earthed. If the camera has an analogue output, disconnect the video cable and check whether the noise persists on the monitor. If it does, the fault is in the monitor’s power supply or cabling rather than the camera. Check whether disconnecting other cameras or video equipment reduces the noise level, as damaged or poorly shielded equipment can interfere with everything else on the system.

Grainy footage at night that is clear during the day is usually a sensor sensitivity issue rather than interference, and often means the camera is not suitable for the lighting conditions in that location.

When to call a professional: widespread noise across multiple cameras almost always points to a systemic earthing or cabling problem.

If the footage is grainy because the cameras are not suited to the environment, we can recommend appropriate replacements during a free site survey.

6. No Video Signal

No signal at all is the most urgent CCTV problem. Cameras that are not displaying anything may as well not be there. The good news is that this fault has a logical sequence of checks.

What to try: start with power. Check the power connectors and cables, and if there is an external power brick, test it separately. If the camera is on a fused power supply, check the fuse. If it uses PoE, check the PoE switch and confirm the camera is actually receiving power.

If the camera is powering up but there is still no image, the problem is in the video or data connection. Check the cable and connectors at both ends. If the camera is IP-based, check the network settings and confirm the camera is visible on the network. Check any network switches, routers, DVR boxes or video multiplexers in the chain, as any one of these can cause a complete loss of signal if it is malfunctioning.

If the camera uses video surveillance software, check whether any streams have been disabled or password protected within the application. Finally, physically inspect the camera for damage. A lens or dome that has been physically damaged may prevent the camera from producing any image even if everything else is working.

When to call a professional: if power and connectivity checks are clear and the camera still shows nothing, you are likely dealing with a failed camera or a fault in the recording equipment.

Book a survey and we will diagnose it on site.

0333 900 0101 sales@network-data-cabling.co.uk Contact us

7. My CCTV Camera Shows a Black Screen

A black screen is slightly different from no signal. The system is receiving something, but the image itself is completely dark. This usually means the camera is working but not producing usable footage.

What to try: check that the optical path is clear. Small lenses at high zoom levels can be blocked by vegetation, dirt or debris. Check that the ambient lighting conditions meet the camera’s specifications, as cameras that cannot record in the dark will produce a black image rather than switching into night mode if they have not been configured correctly. Power the camera off and back on, and if multiple cameras are showing black screens simultaneously, reboot the DVR.

Inspect the camera lens and housing for physical damage. A damaged sensor may still power the camera and transmit data while producing no usable image.

When to call a professional: multiple cameras showing black screens simultaneously often points to a DVR or network fault rather than individual camera failures.

8. My CCTV Camera Is Not Working at Night

If a camera is rated for night use but produces nothing after dark, the infrared LEDs are almost always the cause.

What to try: check that the camera is actually configured for night operation. Day and night cameras that should switch automatically sometimes need the ambient light threshold set correctly before the switch triggers. If the camera is PoE-powered, check that the power budget is sufficient for night operation when the LEDs are drawing additional current. LEDs age and dim over time, so an older camera may simply no longer produce enough infrared light to illuminate the scene effectively.

Check the camera for physical damage, particularly around the LED array.

When to call a professional: if the camera is correctly configured and has adequate power but still does not work at night, the LEDs have failed or the camera has reached the end of its usable life. We can advise on cost-effective replacements.

9. My Camera Shows Deteriorated Images at Night

The camera is working at night, but the footage quality is poor. You may be seeing overexposed patches, white spots, or a generally washed-out image.

What to try: if you are getting areas of complete white or overexposure, check that the camera is not pointing towards bright light sources. Car headlights, security floodlights and streetlamps can saturate the sensor in low ambient conditions, producing large white patches in the image. Adjusting the camera angle is usually the simplest fix.

White spots or halos on the image are often caused by the camera’s own infrared LEDs reflecting off a glass surface nearby. If the camera is positioned close to a window or a glass door, the LEDs illuminate the glass rather than the scene beyond it. Moving the camera or changing the angle typically resolves this.

When to call a professional: if adjusting the angle does not help and the image quality is consistently poor at night, the camera’s sensor or LED array may be degrading. A site survey will determine whether repositioning, additional lighting, or a camera upgrade is the most cost-effective solution.

Book your free survey here.

10. My CCTV Camera Is Not Working on Mobile

If the local view works but mobile access does not, the camera hardware is almost certainly fine. This is typically a configuration or network issue.

What to try: confirm that the camera or DVR/NVR is correctly connected to the local network and that all network settings are configured. Static IP cameras need the correct netmask, gateway and DNS addresses. If the camera uses a cloud-based mobile application, check that the network firewall is not blocking outbound connections. If the system requires a VPN for remote access, confirm the VPN service is running and correctly configured. If it uses dynamic DNS, confirm the DNS settings are correct and note that DDNS does not work reliably on all 4G networks.

Mobile access to CCTV is vendor-specific and there are no universal standards, so problems sometimes come down to the app or firmware version rather than anything in the installation.

When to call a professional: if you have worked through the network configuration and mobile access still does not function, the issue may be in the network infrastructure, including switch configuration, firewall rules or bandwidth limitations. Our team works alongside structured data cabling and network infrastructure, so we can resolve connectivity issues that a CCTV-only engineer might not be able to.

Get in contact today

11. My DVR Is Not Recording Anything

A working camera with a DVR that has stopped recording is a common problem and usually straightforward to resolve.

What to try: check that recording is actually enabled. Factory resets and settings corruption can turn recording off without warning. Check the recording schedule and make sure recording is not limited to specific time windows. Check available storage space and delete footage that is no longer needed if the drive is full. If the DVR uploads to a network server or cloud storage, check its network connection, as the local storage may be full because remote uploads have been failing.

If the drive appears to have space but the DVR is still not recording, the hard drive may be failing. DVRs can often continue to operate from their onboard firmware storage even when the recording drive has died, so a functioning DVR does not guarantee the drive is healthy.

When to call a professional: a failing DVR drive means you may have lost recent footage and your system is currently not recording anything. This is urgent.

Contact us for a prompt response. We carry replacement drives and DVR units and can restore recording capability quickly.

12. My Camera’s Video Is Choppy

Choppy or jerky footage almost always points to a network bandwidth problem on IP camera systems. Analogue systems rarely produce choppy video, but network-connected DVR and NVR outputs can be affected by slow network connections.

What to try: check your camera’s video settings and confirm your network has enough bandwidth to carry the stream. A 4MP H.264-encoded stream requires approximately 8Mbps per camera. If you have multiple cameras on a network that cannot support the combined load, you will see choppy footage. For wireless CCTV cameras, check that the signal strength is adequate at the camera location, as RF interference can reduce effective Wi-Fi speeds significantly even when the camera appears to have a connection.

For wired cameras, check cables for shielding damage and confirm the cable type is appropriate for the run length. Cat6 supports Gigabit over a maximum of 100 metres. Check your NVR’s decoding capacity, as insufficient processing power can cause frames to be dropped, producing choppy playback.

When to call a professional: choppy footage across multiple cameras is often a sign that the network infrastructure is not fit for purpose, including the cabling, the switching, or the bandwidth allocation. Our team installs and upgrades structured data cabling and network infrastructure alongside CCTV systems, so we can address the root cause rather than just the symptom.

Book a free site survey.

0333 900 0101 sales@network-data-cabling.co.uk Contact us

Key Takeaways: When to Call a Professional

Most CCTV problems have a logical sequence of checks you can work through yourself. Power and connectivity faults, configuration issues, and simple positioning problems are all worth tackling before calling anyone out.

The problems that genuinely need a professional are those involving cabling faults, earthing issues, failing hardware, network infrastructure problems, and any situation where the system has stopped recording or producing usable footage. These require proper diagnostic equipment and experience to resolve reliably.

Is your system worth repairing or replacing? If you are dealing with one fault, repair is almost always the right call. If you are experiencing multiple faults simultaneously, if the same problems keep returning, or if the system is more than eight to ten years old, replacement is often more cost-effective. Older systems also frequently produce footage that no longer meets the standards that insurers and the UK police require for evidential use.

ACCL has been installing and maintaining commercial CCTV systems across London and the South East for over 28 years. If your system has a problem you cannot resolve, or if it is simply time for an upgrade, we can help.

Book a free CCTV survey or get in touch. We will come to your site, assess the system and give you a clear, honest recommendation.

FAQs

Q. Why is my CCTV camera not showing a picture?

A. The most common causes are a power failure, a damaged or disconnected cable, or a fault in the DVR or recording equipment. Start by checking that the camera has power, then work through the video connection from camera to monitor. If power and connectivity are confirmed and the camera still shows nothing, the camera itself may have failed. A professional engineer can diagnose the fault on site.

Q. Why does my CCTV footage look blurry or grainy?

A. Blurry footage is usually caused by a dirty lens, incorrect focus settings, or a camera that is not suited to the lighting conditions in its location. Grainy footage is more often caused by electrical interference in the cabling or power supply. Cleaning the lens and checking cable shielding are the first steps. If neither resolves it, the camera may need to be repositioned or replaced.

Q. Why does my CCTV not work at night?

A. Night vision failure on a rated camera is almost always caused by failing infrared LEDs, insufficient power supply for the LEDs, or incorrect camera configuration. Check that night mode is enabled and that the power supply meets the camera’s increased requirements after dark. Ageing cameras often lose night vision capability as the LEDs degrade over time.

Q. Why has my DVR stopped recording?

A. The most common causes are a full hard drive, a corrupted settings file that has reset recording to off, or a failing DVR drive. Check storage space, confirm recording is enabled, and check the recording schedule. If the drive appears healthy but recording has still stopped, the drive may be failing. This is urgent, as you have no footage being captured. Contact a professional promptly.

Q. Why is my CCTV footage choppy?

A. Choppy footage on IP cameras is almost always a network bandwidth problem. A 4MP H.264 stream requires approximately 8Mbps per camera. If your network cannot support the combined load of all your cameras, you will see choppy footage. For wireless cameras, check that signal strength is adequate. For wired cameras, check cable condition and run length. If the problem affects multiple cameras, the network infrastructure may need upgrading.

Q. Can I fix CCTV problems myself?

A. Many CCTV problems including configuration issues, power and connectivity checks, lens cleaning, and simple repositioning can be resolved without professional help. Problems involving cabling faults, earthing issues, failing hardware, network infrastructure, or any situation where the system has stopped recording require a professional engineer with the right diagnostic equipment.

Q. When should I replace my CCTV system rather than repair it?

A. If you are experiencing multiple faults simultaneously, if the same problems keep returning after repair, or if the system is more than eight to ten years old, replacement is often more cost-effective than continued repair. Older systems also frequently produce footage that no longer meets the quality standards required by insurers and police for evidential use. A free site survey will give you an honest assessment of whether repair or replacement is the better option for your specific system.

Q. How do I know if my CCTV system meets UK police standards for evidential quality?

A. The Home Office publishes requirements for CCTV image quality for police use. In practice, this means cameras need to produce footage at a resolution and frame rate sufficient to identify individuals. Many older analogue systems and low-resolution IP cameras no longer meet these standards. If your system has not been assessed recently, a professional survey will confirm whether the footage quality would be usable in the event of an incident.

Get in touch today

Have a no-obligation chat with one of our data cabling experts, who can recommend a solution to suit your requirements and budget.

0333 900 0101 sales@network-data-cabling.co.uk Contact us