CCTV Not Recording? Troubleshooting Guide for Common Problems

Your CCTV system exists for one reason: to record usable footage when you need it. So discovering that cameras aren't recording, the picture quality has degraded, or your app won't connect is frustrating — and concerning. The footage you needed might already be lost.

As professional CCTV installers who maintain and repair systems across London, we troubleshoot these problems daily. This guide covers the most common CCTV issues and their fixes — from simple resets you can do yourself to problems that need professional attention.

Problem 1: CCTV Not Recording

This is the most common issue we're called out for — and the most dangerous, because you may not notice until you need the footage and discover it doesn't exist.

Check 1: Is the hard drive full?

Your NVR (Network Video Recorder) or DVR (Digital Video Recorder) stores footage on an internal hard drive. If the system isn't configured to overwrite old footage when the drive is full, it simply stops recording.

• Log into your NVR interface (via monitor or web browser)
• Navigate to Storage or HDD Management
• Check the drive status — it should show "Normal" and have available space
• Enable "Overwrite" or "Circular Recording" so the oldest footage is automatically replaced

Check 2: Is the NVR powered on?

This sounds obvious, but NVRs get accidentally unplugged — cleaners moving furniture, other equipment being plugged into the same socket, or power strips being switched off. Check the NVR has power and is running. The front panel should show indicator lights.

Check 3: Has recording been disabled?

Settings can be accidentally changed — especially if multiple people have admin access. Check:

• Recording schedule — is 24/7 recording enabled, or only motion-triggered?
• Channel status — are all camera channels set to record?
• Motion detection — if set to motion-only, are the detection zones correctly configured?

Check 4: Date and time settings

An incorrect date/time causes confusion when searching for footage. If your NVR shows the wrong date, it may appear as though footage is missing when it's actually recorded under wrong timestamps. Set the correct time zone and enable NTP (automatic time sync).

Problem 2: No Picture / Black Screen

One or more cameras showing a black screen or "No Signal" message on your monitor or app.

Single camera black:

• Power issue: Check the camera's power supply and cable connections. PoE cameras get power through the network cable — check the cable at both ends (camera and NVR/switch).
• Cable damage: Outdoor cables exposed to weather, rodents, or accidental damage can fail. Look for visible damage along the cable run.
• Camera fault: If the camera has no IR LEDs glowing at night and no response to power cycling, the camera may have failed. Water ingress is the most common cause of outdoor camera failure.

All cameras black:

• NVR power: If the NVR has no power, no cameras will display. Check the power supply unit.
• Network switch: If you use a separate PoE switch, check it has power and shows activity lights.
• Monitor connection: If viewing on a monitor connected to the NVR, check the HDMI/VGA cable connection.

Problem 3: Poor Image Quality / Blurry Footage

Causes and fixes:

• Dirty lens: Outdoor cameras accumulate dust, cobwebs, and water spots. Clean the lens dome or cover with a soft cloth and glass cleaner. This single step fixes the majority of "blurry camera" complaints.
• Condensation inside dome: If moisture has entered the camera housing, there's a seal failure. The camera needs removing, drying, and resealing — or replacement if the seal can't be restored.
• Resolution settings: Check your NVR recording settings. If resolution has been reduced (sometimes done to extend storage), image quality drops. Set each channel to the camera's maximum resolution.
• Bandwidth/bitrate: If your NVR is compressing footage too aggressively, detail is lost. Increase the bitrate setting for each channel — but note this will increase storage consumption.
• Outdated camera: Cameras older than 7–8 years may be 1MP or less. Modern 2K and 4K cameras produce dramatically clearer footage. Read our guide to the best CCTV systems in 2025.

Problem 4: Night Vision Not Working

Cameras show clear daytime footage but produce dark, grainy, or completely black images at night.

• IR LEDs not activating: Check that the camera's IR (infrared) mode is set to "Auto" not "Off." The IR LEDs should visibly glow red when viewed in darkness (some cameras have covert IR that's not visible to the naked eye).
• IR reflection: If the camera is mounted under an eave or close to a wall, IR light can reflect off nearby surfaces and wash out the image. Reposition the camera so IR light projects outward without obstruction.
• Spider webs: Spiders are attracted to IR warmth and frequently build webs across camera lenses. The web reflects IR light and ruins the image. Regular cleaning prevents this.
• Insufficient IR range: If you're monitoring a large area (garden, car park), the camera's IR range may be insufficient. Cameras with 30m IR range won't illuminate objects at 40m. Consider supplemental infrared illuminators or upgrading to cameras with extended IR range.

Problem 5: App Not Connecting / Remote Viewing Down

You can view cameras on the monitor connected to the NVR, but the smartphone app won't connect or shows "Device Offline."

Step-by-step fix:

1. Check your home/office internet: Is the router working? Can other devices access the internet? If your broadband is down, remote viewing won't work until it's restored.
2. Check the NVR's network cable: The Ethernet cable from your NVR to your router may have been disconnected. Check both ends.
3. Router changed or updated: If your ISP replaced your router, or your router was factory reset, the NVR may need reconfiguring for the new network. Check the NVR has an IP address assigned in the router's connected devices list.
4. P2P/Cloud status: Most modern systems use P2P (peer-to-peer) cloud connection. Check the NVR's network settings — P2P status should show "Online" or "Connected."
5. App update required: Check your app store for updates. Outdated apps sometimes lose compatibility with server-side changes.
6. Port forwarding (older systems): Older systems that don't use P2P rely on port forwarding in your router. If your router changed, port forwarding rules need reconfiguring.

Problem 6: False Alerts / Too Many Notifications

Constant motion alerts from pets, car headlights, trees, and shadows make notifications useless — you stop checking them, and miss the one that matters.

Fixes:

• AI person/vehicle detection: Modern cameras distinguish between people, vehicles, and other motion. If your cameras support AI detection, enable it and disable generic motion alerts. This alone eliminates 90%+ of false alerts.
• Motion detection zones: Draw detection zones that exclude trees, roads, and areas where non-threatening motion occurs. Focus zones on entry points, paths, and access areas.
• Sensitivity adjustment: Reduce motion sensitivity from the default (often too high). Incrementally lower until false alerts stop but genuine person detection remains reliable.
• Schedule-based detection: Set alerts for out-of-hours only. During business or waking hours, you may not need push notifications for every person walking past.

When to Upgrade vs Repair

Sometimes repairing an old system costs more than it's worth. Consider upgrading if:

Preventive Maintenance Checklist

Avoid problems before they happen. Every 6 months, run through this checklist:

1. Clean all camera lenses — dust, cobwebs, and water spots degrade image quality
2. Check recording status — verify all channels are recording and the hard drive is healthy
3. Test playback — search for footage from the past week and confirm it plays back clearly
4. Check night vision — view cameras after dark to confirm IR LEDs are working
5. Test remote access — open the app away from your Wi-Fi to confirm remote viewing works
6. Update firmware — check for NVR and camera firmware updates (or have your installer do this)
7. Review camera angles — have any cameras shifted? Are they still covering the intended areas?
8. Check cable connections — look for loose connections, water ingress at junction boxes, and rodent damage

Need Professional Help?

If you've worked through these steps and your system still isn't working properly — or if you've decided it's time to upgrade — we're here to help. We repair, maintain, and upgrade CCTV systems across London and the Home Counties.

Repair callouts are available same-week. Upgrades include a free site survey to design the right system for your property. Call 02036 330809 or request a callback.