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Solved
Fan is pulsing in OS 6.7.1 on my Ultra 2
Hi there, lately I updated my ultra2 to the latest firmware (6.7.4 - comming from 6.5.0), since then the fan is pulsing every some seconds. The fan goes within 1 sec from ~700 rpm to 1000 rpm an...
I believe we have located the issue. There is a hardware chip that is tasked with controlling the fan speed, and we give it a target RPM. I believe the tolerance range is set too tight for some fans, and when they can't get close enough to the target it results in the pulsing action you described. Next firmware release will relax the tolerace which should resolve it.
select a different setting for fans
or dont sit near the nas.
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