Error Messages - Lenovo ThinkPad T420i Hardware Maintenance Manual

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.
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.
FRU or action, in sequence
1. Fan.
2. Thermal grease.
3. System board.
System board.
Replace the battery.
Chapter 4
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Related service information
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