If your DVR / NVR fan is not working, it may be due to dust or debris that has built up and stopped the fan from spinning. You can resolve this problem by opening your DVR / NVR and carefully cleaning the fan.
To access and clean the fan:
Power off the DVR / NVR system and unplug all cables.
WARNING: Ensure the system is powered off and the power cable is disconnected before opening your DVR / NVR.
Remove the screws of the DVR / NVR cover, then slide the cover off.
WARNING: The inner casing of the DVR / NVR has sharp edges that can lead to injury if not carefully handled. Be careful not to let any tools or loose parts touch sensitive components such as the circuit board.
Carefully clean the fan using a compressed air can.
Carefully replace the cover of the DVR / NVR and tighten cover screws.
Reconnect the power source and monitor.
Power on the DVR / NVR to ensure the fan is operational.
If the fan does not start working after cleaning, contact Technical Support.