Lenovo ThinkPad T420si User Manual page 200

Solution: The EEPROM checksum is not correct (block # 0 and 1). The system board should be replaced,
and the box serial number needs to be reinstalled. Have the computer serviced.
• Message: 0189: Invalid RFID configuration information area
Solution: The EEPROM checksum is not correct (block # 4 and 5). The system board should be replace,
and the UUID needs to be reinstalled. Have the computer serviced.
• Message: 0190: Critical low-battery error
Solution: The computer turned off, because the battery is low. Connect the ac power adapter to the
computer and charge the battery, or replace the battery with a fully charged one.
• Message: 0191: System Security - Invalid remote change requested
Solution: The system configuration change has failed. Confirm the operation and try again. To clear
the error, enter the ThinkPad Setup.
• Message: 0192: System Security - Embedded Security hardware tamper detected
Solution: The Security Chip has been replaced with a different one. Have the computer serviced.
• Message: 0199: System Security - Security password retry count exceeded
Solution: This message is displayed if you enter a wrong supervisor password more than three times.
Confirm the supervisor password and try again. To clear the error, enter the ThinkPad Setup.
• Message: 0251: System CMOS checksum bad - Default configuration used
Solution: The system CMOS might have been corrupted by an application program. The computer uses
the default settings. Run ThinkPad Setup to reconfigure the settings. If you still see the same error code,
have the computer serviced.
• Message: 0253: EFI Variable Block Data was destroyed.
Solution: The system EFI Variable Block Data might have been corrupted. Press F1 to go to the ThinkPad
Setup. Press F9 and then press Enter to load the default setting. Press F10 and then press Enter to restart
the system. If you still have a problem, have the computer serviced.
• Message: 0271: Check date and time settings
Solution: Neither the date nor the time is set in the computer. Set the date and time, using the ThinkPad
Setup.
• Message: 1802: Unauthorized network card is plugged in - Power off and remove the network card.
Solution: The mini PCI Express network card is not supported on this computer. Remove it.
• Message: 1820: More than one external fingerprint readers are attached. Power off and remove all but
the reader that you set up within your main operating system.
Solution: Power off and remove all but the reader that you set up within your main operating system.
• Message: 2000: ThinkVantage Active Protection sensor diagnostics failed.
Solution: ThinkVantage Active Protection sensor is not working correctly. Have the computer serviced.
• Message: 2100: Detection error on HDD0 (Main HDD)
Solution: The hard disk is not working. Have the hard disk serviced.
• Message: 2101: Detection error on HDD1 (Ultrabay HDD)
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User Guide