CEM3 Fan Fail Error
Symptoms/Issue
CEM3 is reporting Fan Fail error
Fan is not working
Explanation of Issue
There could be multiple causes of this issue. In order of most common to least common cause:
The rack fan has failed
The fan fuse (F2) on the CEM3 has blown
U23 on the CEM3 has failed
The fan relay (K1) on the CEM3 has failed
Fan Still Works
If the fan is working and the CEM3 is reporting a Fan Fail error, then very likely something in the fan current sense circuitry has failed. This cannot be fixed in the field
Fix/Solution
With the CEM3 powered off and removed from the system, check F2. If the fuse is good and the fan is good, U23 is the likely cause and will need to be sent in to be repaired. Please contact ETC Technical Services if this is the case