RN104 'Fan System in enclosure Internal speed is below threshold. (0 rpm)' message

[lawriebuck]

Hey all,

This morning on my RN104 I got the error message "Fan System in enclosure Internal speed is below threshold. (0 rpm)", However the fan is running flat out, sounding almost like a hair dryer. No adjustment to the fan speed settings in the Admin page seem to make any difference.

Recent changes: 12 days ago I installed a new drive after a drive became degraded. I then upgraded from 6.10.2 to 6.10.3.

A reboot makes no difference.

I am running 6.10.3 firmware.

Does anyone have any suggestions as to what the issue may be and a possible fix?

[Sandshark · Accepted solution]

It sounds like the tachometer signal from the fan isn't working.  Obviously, use warranty replacement if that's an option.  Otherwise, hopefully, it's the fan itself and a fairly easy fix by replacing it.  If it's the monitor circuit, there's nothing you can do save add a "pad" that lowers the fan speed (but does nothing to correct the NAS's ability to monitor or control the speed).

[Marc_V]

@lawriebuck

Welcome to the Community!

Do you notice if there's a change in the temp of the NAS itself? or the drives might be running hot.

If you still have warranty on your RN104, which is 3 years it is best to contact Support so they can issue you RMA if needed.

HTH

[Sandshark · Accepted solution]

It sounds like the tachometer signal from the fan isn't working.  Obviously, use warranty replacement if that's an option.  Otherwise, hopefully, it's the fan itself and a fairly easy fix by replacing it.  If it's the monitor circuit, there's nothing you can do save add a "pad" that lowers the fan speed (but does nothing to correct the NAS's ability to monitor or control the speed).

[lawriebuck]

Hey @Marc_V 

Thank you for your reply.

Both drives are maintaining a steady 19 to 20 degrees C (68 degrees F).

The CPU temp is a pretty steady 34 degrees C (91 degrees F).

I no longer have warranty on this product so I am happy to do whatever is economically viable to repair it.

Cheers,

Lawrence

[lawriebuck]

Hello @Sandshark

Thanks for your suggestion!

Out of warranty unfortunately.

I was hoping it might be a software issue with a software fix, but I'm happy to change out the fan to see if that will fix it.

Can you suggest any other troubleshooting I could do to help me to determine if it is a software or hardware issue?

Regards,

Lawrence

[Sandshark]

If you have any old fan you can connect temporarilly to see if it then senses the RPM, that would be good.  Otherwise, I don't know of anything without an oscilloscope or frequency counter.

[lawriebuck]

@Sandshark 

Great! I'll give that a crack and report back. Thanks for the suggestion.

Lawrence

[lawriebuck]

So, I got a new fan to replace the old one.

I could not find a fan with similar specs to the original fan ( Protechnic MAGIC MGT9212YB-025 ) so I replaced it with what seemed to be a respected model ( NOCTUA NF-B9 redux-1600 )

No more error messages. Drives and CPU running at 33 degrees C and 53 degrees C respectively.

Thanks @Sandshark & @Marc_V  for your suggestions!

Lawrence

[Sandshark]

Glad to be of assistance, and that your problem was so cheaply fixed.