Why Your CCTV Cameras May Be Recording Nothing — And How to Find Out
The most dangerous CCTV failure is the one you don't know about. A camera that appears to be working on a monitor may have stopped recording days ago. Here are the three most common silent failures — and how to detect them before they become a problem.
1. Camera Offline (Disconnected)
IP cameras can go offline due to network issues, PoE switch failure, power fluctuations or physical cable damage. The NVR interface may show a grey or black screen, or may continue to show the last cached image, giving a false impression that the camera is live.
How to detect it: Check the NVR's camera status page regularly. Any camera showing "offline", "disconnected" or with a red icon requires immediate attention. With Pujaso's CCTV Health Monitoring service, you receive an instant WhatsApp alert the moment any camera goes offline.
2. HDD Failure or Degradation
NVR hard drives spin continuously, 24 hours a day, 365 days a year. Most drives have a rated lifespan of 3–5 years under these conditions. A failing drive may continue to show footage on screen while silently losing data, generating write errors or corrupting stored recordings.
How to detect it: Access the NVR's storage management page and check for HDD health status (some NVRs display S.M.A.R.T. data). Regularly check that the recording indicators on the camera channel list are active. Watch for any "HDD error" or "HDD abnormal" warnings in the event log — these often appear weeks before a catastrophic failure.
3. Storage Full — Overwrite Loop Stopped
When NVR storage reaches 100% capacity, most systems are configured to overwrite the oldest footage automatically. However, some configurations, firmware bugs or manual settings changes can cause recording to stop rather than overwrite — leaving you with a full drive and no new recordings.
How to detect it: Monitor the storage used percentage on your NVR dashboard. Set an alert at 80% capacity. If your system is configured to overwrite, check that the overwrite setting is enabled. If it is not overwriting as expected, check for storage warnings in the event log.
The Easiest Solution: Continuous Health Monitoring
Manually checking NVR health across 20, 50 or 100+ cameras every day is not practical for most security teams. Pujaso's CCTV Health Monitoring Service connects to your existing NVRs and cameras remotely, continuously checks camera status, HDD health and storage levels, and sends you instant WhatsApp alerts and daily email reports so you know the moment anything needs attention — without having to check anything yourself.
Key Takeaways
- Camera offline, HDD failure and full storage are the three most common silent CCTV failures
- A camera showing a static image on screen may have stopped recording
- Check NVR HDD health (S.M.A.R.T. data) regularly — failures often give weeks of warning
- Monitor storage used percentage and set alerts at 80% capacity
- Pujaso's CCTV Health Monitoring Service automates all these checks with instant WhatsApp alerts