5. Troubleshooting
Situation Solution
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
Fan end of life. Replace the fan. See "Replacement of the Light processor c ompa rtment fan", page 293.
20
1
Image 5-50
Code 7905: “Fan speed engine too low” (Warning)
Situation Solution
Partial bloc ked Light Processor fan
(reference 1 image 5-50) F an is still
turning but som ething slows down
the fan speed.
Unblock the fan. Ensure that the fan can turn freely.
Damaged wire unit (reference 20
image 5-50 and image 5-49)
Check if the wire unit of the fan is not damaged. Repair if possible, otherwise replace
with new one.
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
Light P rocessor fan end of life. Replace the fan. See "Replacement of the Light processor compartment fan", page 293 .
Code 7906: “Fan speed engine too high” (Warning)
Situation Solution
Malfunction Light Processor fan
(reference 1 image 5-50).
Replace the Fan. See "Replacement of the Light processor com partment fan", page 293
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
Code 7907: “Fan speed engine too high” (Error)
This error code is probably preceded by the warning code 7906: “Fan speed engine too high”. The s ame troubleshooting table can
be a pplied to.
Code 7928: “Fan speed electronics top too low”
(Error)
This error code is probably preceded by the warning co de 7928: “Fan speed elec tronics top too low”. The sam e troubleshooting
table can be applied to.
Code 7929: “Fan speed electronics top too low” (Warning)
Situation Solution
Part ial blocke d top f a n (refe ren ce
1 image 5-51) Fan is still turning
but something slows down the fan
speed.
Unblock the fan. Ensure that the fan can turn freely.
Damaged wire unit (reference
3 image 5-51 and reference
20image 5-49)
Check if the wire unit of the fan is not damaged. Repair if possible, otherwise replace
with new one.
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
Electronic top fan end of life. Replace the fan. S ee "Replacement of the Card Cage electronics fans", p age 288.
78 R5905312 HDF W SERIES 24/01/2013
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