Fan or PSU Noise — Neo Matrix and ProAmp8

Modified on Tue, 28 Apr at 11:13 PM

A grinding, rattling, or unusually loud fan noise from a Neo Matrix or ProAmp8 is a hardware fault that will not resolve itself and will typically worsen over time. This article explains how to confirm the fault, what to check in the logs, and what to send to Pulse-Eight support to raise a warranty request.

Normal vs Abnormal Fan Noise

Both the Neo Matrix and ProAmp8 are fan-cooled. Under normal operation, the fan is audible at low speed — a consistent, quiet hum. The following sounds indicate a hardware problem:

Grinding or rattling: The fan bearing is failing. This will worsen and eventually the fan will stop entirely, causing the unit to overheat.
Loud or intermittent buzzing: Often caused by the fan blade catching on wiring, debris, or a failing bearing.
High-pitched whine that varies: Can indicate PSU instability rather than the fan itself.
Fan running at maximum speed constantly: The unit may be overheating, or the fan controller may have failed. Check the operating environment — confirm the rack has adequate ventilation and the unit is not stacked against other heat-generating equipment.

What to Try First

Check rack ventilation

Confirm the rack has adequate airflow — at minimum 1U of ventilation space above and below heat-generating units. Confirm no blanking panels are blocking airflow to the unit. In a hot rack environment, fan speed will increase to compensate and may sound louder than normal.

Reboot the unit

A single reboot is worth trying. If the noise resolves after a reboot and does not return, monitor the unit over the next few days — this may indicate an intermittent fault that is beginning to develop.

If the noise is present immediately on power-on, is getting progressively worse, or has not responded to a reboot, it is a hardware fault. Proceed to raising an RMA.

What to Send to Support

Unit serial number (label on rear — P8SN followed by 7 digits)
Unit model (Neo Matrix model or ProAmp8)
Description of the noise — grinding, rattling, high-pitched whine, constantly at maximum speed
When the noise first appeared and whether it has changed since
Whether a reboot was attempted and the result
A video clearly demonstrating the noise — phone video held close to the unit and clearly showing the fan is usuall sufficient. Support cannot assess severity without hearing the noise or seeing the fan.
Full error log from System Health (Neo Matrix only) — see How to Send the Full Error Log

Fan/PSU noise faults are generally straightforward to approve once a video is provided. Having the video ready in your first message significantly speeds up the process.

Ready to raise a warranty request?
Have your serial number, video, and error log (for Neo Matrix) ready when you contact us.

UK: 01202 413 610 | US: (858) 748-8250 | support@pulse-eight.com