Fan not detected, but it's working
Posted: Tue Nov 18, 2025 6:44 pm
Hi Everybody,
I've had a WS-12-250-DC running at home for almost 10 years, it's been giving exceptional service.
Recently I've been noticing that the fan is running at full speed and there was an error appearing in the log;
eg. Nov 19 09:00:02 switch[827]: Warning: expected 1 fans but found 0
I replaced the fan with a new 24V Sunon fan but the fault is not resolved. The fan is still running at full speed. I can confirm that the fan speed tach signal is visible on the yellow wire of the fan.
It would appear that something else has failed on my switch. Normally I wouldn't be too concerned as long as the fan was running, but these small fans really scream when they are running at top speed.
Has anyone else come across a fan fail fault like this?
Michael.
I've had a WS-12-250-DC running at home for almost 10 years, it's been giving exceptional service.
Recently I've been noticing that the fan is running at full speed and there was an error appearing in the log;
eg. Nov 19 09:00:02 switch[827]: Warning: expected 1 fans but found 0
I replaced the fan with a new 24V Sunon fan but the fault is not resolved. The fan is still running at full speed. I can confirm that the fan speed tach signal is visible on the yellow wire of the fan.
It would appear that something else has failed on my switch. Normally I wouldn't be too concerned as long as the fan was running, but these small fans really scream when they are running at top speed.
Has anyone else come across a fan fail fault like this?
Michael.