CCTV maintenance: checking cameras, recordings and alerts
Use a practical checklist to inspect image quality, focus, storage, playback and alerts in a video-surveillance system.
CCTV maintenance should reveal when a camera no longer shows the expected scene and confirm that recorded footage can be retrieved. Inspection frequency depends on the environment, criticality and manufacturer guidance. A documented checklist makes results comparable from one visit to the next.
Check each camera's view
Compare the current image with a reference view. Look for dirt, condensation, vibration, changes in focus, new obstructions, reflections and insufficient light. Clean the housing using a method suitable for the equipment, and do not change the framing without recording it.
Check daytime and night-time scenes separately where relevant. A camera may stream video while its image is unusable in backlight or infrared conditions. Record the date, camera and result so trends can be identified.
Confirm recording and retrieval
A powered-on recorder is not enough. Select a camera and a recent time period, then confirm that an authorised person can search, play back and export footage. Check storage health and compare the actual recording history with the project's retention policy.
If recordings are missing, find out whether the cause is the camera, network, configuration, storage or power before replacing equipment. Keep evidence of the incident and confirm that the correction solves it.
Make alerts actionable
Review which events trigger alerts, who receives them and what action is expected. If false positives are frequent, adjust the detection area or sensitivity in a controlled way, then verify that important events are still detected. Do not enable alerts with no owner.
Maintenance checklist
- Clean cameras and inspect mountings, connectors and exposed junction boxes.
- Check images under representative lighting conditions.
- Confirm all cameras appear live and their clocks are consistent.
- Play back and export a sample using the approved procedure.
- Check storage, recorder status, ventilation and manufacturer alerts.
- Record findings, changes, the person responsible and the next inspection date.
Do not open drives or handle electrical components unless you are qualified. Follow manufacturer procedures and warranty conditions.
How often should cameras be serviced?
There is no single interval for every site. Set a frequency based on dust or weather exposure, the importance of coverage, system use and manufacturer recommendations. Increase checks when an incident or environmental change warrants it.
How do I know the system is recording properly?
Check recent playback, continuity of the timeline and export of a sample, as well as the recorder's reported status. Repeat the test after configuration changes or maintenance.
