I’ve replaced factory fan on my WD My Cloud EX2 Ultra with Noctua NF-A4x10 FLX fan.
All works great, fan is very very silent, temperature keeps as before (if not better) but, what happens now, is that time to time (every other day or so) I am getting “Fan not working” error notification.
I suspect there is some kind of monitoring for the fan RPM, in case of Noctua fan the RPM is about 2200 which might be lower than the original.
The alert seems to be triggered right after NAS wakes up from sleep.
System Test also returns all good with fan:
Anybody knows how the fan status monitoring is being implemented on OS5?
Would be very grateful.