CCTV security system common faults like cameras not working

Here you can find some of the most common security camera system faults when your system just stops working or you have freshly installed it and cannot get it to work. These apply to both installed and DIY security camera systems and cover both cameras and the DVR / XVR / NVR recorder.

DVR/NVR stuck on a loading page:

  • Power adapter - test the power adapter to see if it is getting the correct output using a volt meter tester. Usually DVR 12v 2-5amp; NVR 48-52v 2.5amp. (Check DVR/NVR specs for recommended power supply!) Also try connecting the DVR/NVR to a different power outlet but be extremely careful not to get the wrong power supply, wrong voltage, wrong polarity or AC/DC. You should also where possibly test your power supply under load, meaning if you test it without anything plugged in, it may seem fine, but once your XVR/NVR is plugged it, under load, it may drop to a low voltage.
  • HDMI/VGA cable or connection - you can try to re-seat the cable; connect it to a different port on your TV/Monitor; try another cable, and for new systems, make sure it is a 4k cable.
  • Hard drive – Disconnect Hard Drive and reboot. Successful boot, hard drive fault, or power supply under load issue.

DVR/NVR Offline and/or no remote view:

  • Check Network Cable is connected to Modem/Router and lights are flashing.
  • Wi-Fi Extender - Try pressing the WPS button on your Wi-Fi Extender and then the Modem/Router (within 2 minutes). This should re-establish the connection between the 2 devices if lost.
  • Check IP/Gateway address – enable DHCP and reboot. If online uncheck DHCP and save.
  • Remote view login – check username and password are correct. App login uses client created username and password if/when they registered. Device login for CLOXXX series is DVR/NVR serial number, username (admin) and password (12345).
  • If you have entered the wrong password too many times, your system my be locked and needs to be unlocked by manufacturer, this is a security feature with some new models.

Camera Image Faults:

  • Night vision glow/IR bounce back – Ensure minimum 2mm gap between lens and dome housing; nothing too close like a white eave, a drain or wall etc. These can cause IR bounce back which shows as a halo or white haze on the screen at night. The easy way to test is to face the camera in a different direction and see if the haze increases or decreases.
  • IR intermittent issues - Low voltage. Allow 1 amp per camera i.e. 8 cams, use 2 x 4-way splitters and 2 x 5amp Power Supplies.
  • Interference lines – check cable, connections and baluns. Avoid by using preferred Coax over Cat5/6. If you are using cat5e or Cat6 UTP cables with baluns, be aware of the camera's technology type as there are baluns suitable for use with HDCVI, HDTVI or AHD. Also be aware of the maximum distance that the product can be used for the chosen technology. Some Baluns do not work with some brands or some models of cameras.
  • If the image displayed from the camera has a pink tint to it the most common cause is that the IR-CUT did not switch off properly to filter out the invisible light. Power down the camera and power back up, you should normally hear a click, if not a gentle tap on the side of the camera housing with a screw driver handle can sometimes free them up.
  • If grounding is done improperly, you may see bands rolling on the screen, if this is the case, there is an interference problem called the ground loop and you should check all connections, and ensure cameras are not on live materials. Sometimes this is a fault with the buildings electrical circuit.


Insufficient Power Supply:

The insufficient power supply is, very often, the culprit of the video loss on one or all security cameras, CCTV video loss at night, video signal loss on screen, camera going black at night, or camera video flickering on and off.

  • Loose cable connection.
  • PoE switch or PoE injector.
  • Cable is too long, or one cable is supplying too many cameras at once.
  • Faulty power cables (old, damaged, degraded or cut).

Power Spike & Interference:

Another horrendous hazard is power spike. It is likely to cause sudden video loss on security cameras, all CCTV cameras black screen, a camera with the electrified surface, the camera with a vertical/horizontal line, or serious damage to the camera circuit board or other components.

  • Mounting security camera to a metal/conductive surface.
  • Lightning strikes.
  • Strong electrical currents interference from nearby electrical equipment. This can even happen from a neighbours welder.

Weak WiFi Connection or Low Bandwidth:

Video loss or weak video signal among WiFi security cameras and systems could be caused by unstable network connections, weak WiFi connection or low internet bandwidth.

  • The wireless security camera is too far away from the home router.
  • Too many barriers between your camera & WiFi router.
  • WiFi signal interruption & interference.
  • Insufficient bandwidth via PoE switch or NVR.

IR Cut Filter & Faulty IR Night Vision:

Some users experience CCTV camera black screen or video going black at night, it’s likely that the camera lacks infrared night vision, or the IR night vision camera doesn’t have an IR cut filter or a faulty IR sensor, or you simply forget to turn the IR on. Sometimes your IR cut filter may get stuck during transport, a gentle tap on the side of the camera with a srewdriver handle can sometimes free it us and fix this issue.

Signal Type & Compatibility

Sometimes, your DVR or NVR shows video loss or no video, it’s possible that your XVR/NVR/DVR is not capable of decoding the video stream, especially different brands of cameras or cameras with a higher resolution like 5MP or 4MP can’t be decoded or compatible with NVRs/DVRs that are designed to decode 1080p camera. In some rare cases, the DVR is not able to understand a signal type that the CCTV camera is using, especially among some old CCTV cameras.

DVR / NVR: System continuously restarting.

If the DVR / NVR is rebooting repeatedly, the issue may be caused by insufficient power or a hard disk drive (HDD) error. Check that the correct power adapter is in use and that the DVR / NVR is receiving enough power.

If all the above fails, we recommend contacting your lace of purchase.

Categories: OzSpy Branded DVRs and Cameras
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