5. Troubleshooting
Code 7953: “Fan speed power supply left too low” (Warning)
Situation Solution
Partial blocked power supply left fan
(reference 1image 5-55) Fan 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
2image 5-55 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.
Power s upply left fan end of life. Replace the fan. See "Replacement of the SMPS fans", page 289.
Code 7954: “Fan speed power supply left too high” (Warning)
Situation Solution
Malfunction power supply left fan
(reference 1 image 5-56).
Replace the Fa n. See "Replacement of the SMPS fans", page 289.
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
1 32
4
Image 5-56
Code 7955: “Fan speed power supply left too high” (Error)
This error code is probably preceded by the warning code 7954: “Fan s peed power supply left too high”. The same troubleshooting
table can be applied to.
Code 7956: “Fan speed power supply right too low
”(Error)
This error code is probably preceded by the warning code 7957: “Fan speed power su pply right too low”. The same troubleshooting
table can be applied to.
Code 7957: “Fan speed power supply right too low” (Warning)
Situation Solution
Partial blocked power supply right
fan (reference 3image 5-56 ) Fan
is still turning but so mething s lows
down the fan speed.
Unblock the fan. Ensure that the fan can turn freely.
Damaged wire unit (reference
4image 5-56 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.
Power su pply right fan end of life. R eplace the fan. See "Replacement of the SMPS fans", page 289.
Code 7958: “Fan speed power supply right too high” (Warning)
Situation Solution
Malfunction power supply right fan
(reference 3image 5 -56).
Replace the Fa n. See "Replacement of the SMPS fans", page 289.
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
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