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Why Is My Security Recorder Making a Loud Humming Noise?

  • Writer: HDSS Support
    HDSS Support
  • Jun 27
  • 2 min read

If you’re hearing a constant humming or knocking sound coming from your security camera recorder, don’t panic—it’s usually coming from the built-in fan. All DVRs and NVRs have internal cooling fans to keep the hard drive and system components at a safe operating temperature.

While it's normal to hear a light fan noise when the system is running, excessive humming or knocking could indicate a problem. Here’s what you need to know:

Common Reasons for a Loud Recorder Fan:

1. Dust Buildup or Clogged VentsOver time, dust can collect inside your recorder, especially around the fan and ventilation areas. This buildup causes the fan to work harder, increasing the noise level and reducing cooling efficiency.

How to Clean It:

  • Look at the sides or back of your recorder for air vents.

  • If you see dust buildup, use a can of compressed air (air duster) to blow the dust out.

  • Avoid opening the recorder unless you're trained, as internal components can be sensitive.

2. Fan Obstruction or Nearby ItemsIf your recorder is surrounded by other devices, papers, or stored in a closed cabinet, the lack of airflow can cause the fan to overwork, leading to loud humming.

What to Do:

  • Make sure the recorder is in a well-ventilated area.

  • Remove any items stacked around or on top of it.

  • Avoid enclosing it in tight spaces without airflow.

3. Failing or Damaged FanIf you hear a knocking or grinding noise, the fan itself may be worn out or damaged. A failing fan can lead to overheating, which may damage your hard drive or affect system performance.

Next Steps:

  • If cleaning doesn’t resolve the noise, the fan may need to be replaced.

  • Contact us to inspect the system and replace the fan if needed.

Can I Turn Off the Fan?

No. The fan is essential to keep the hard drive and internal components cool. Turning it off or trying to silence it can lead to system failure or loss of recordings.

Need Help?

If you're not sure whether the noise is normal or you suspect the fan is failing, we can help. Contact us at customersupport@hdssfl.com to request remote support or schedule an in-person service call.

Keeping your recorder cool and quiet ensures your system stays reliable and protects your recordings—don’t ignore unusual noises.

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