CEM3 Fan Fail Error

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Symptoms

My CEM3 is reporting Fan Fail error, and the fan is not working.

Solution

The information in this post is provided to assist in troubleshooting. Perform work at your own risk. ENSURE ANY POWER FROM DEVICES HAS BEEN DISCONNECTED BEFORE SERVICING ANY EQUIPMENT. If you do not feel comfortable performing the work, please contact us or your local service center. Be aware that ETC and its Affiliates are not responsible for any damage or injury caused by service of our products by anyone other than us or our authorized service providers, and such damage is excluded from the product’s warranty.

There could be multiple causes of this issue. Most commonly, this is either a genuine failure of the fan or a failure of the fan fuse, labeled F2 on the CEM3 circuit board.

After powering off the rack, remove the CEM3 from the rack and test continuity on F2 with a mutimeter. If F2 does not show continuity, then you will need to purchase a replacement from an ETC dealer (ETC pact number F171-F) or your local hardware store (5A 250V glass fuse).

If the fan is running and F2 tests OK, please contact ETC technical services, as your unit will need to come in for service. This is an indicator that something in the fan sense circuitry has failed, which cannot be fixed in the field.