Lenovo ThinkPad T420 Hardware Maintenance Manual - Page 55

Error messages, Table 3. Error messages - fan error

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Error messages Table 3. Error messages Symptom or error Fan error. Thermal sensing error. This system does not support batteries that are not genuine Lenovo-made or authorized. This system will continue to boot, but may not charge unauthorized batteries. FRU or action, in sequence 1. Fan. 2. Thermal grease. 3. System board. System board. Replace the battery. Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use. Chapter 4. Related service information 49

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Error messages
Table 3. Error messages
Symptom or error
FRU or action, in sequence
Fan error.
1.
Fan
.
2. Thermal grease.
3. System board.
Thermal sensing error.
System board
.
This system does not support batteries that are not
genuine Lenovo-made or authorized. This system will
continue to boot, but may not charge unauthorized
batteries.
Attention:
Lenovo has no responsibility for the
performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out
of their use.
Replace the battery
.
Chapter 4
.
Related service information
49