"Error:161 (24:x)"
The following conditions cause this error.
Format the SRAM area.
Perform formatting on the [Main Menu] → [SRAM/Clock] Adjustment screen in Main Menu screen on the V8/TS series unit.
For information on the format procedure, click here.
* For V8 series, be sure to set the battery.
For information on the battery mounting procedure, click here.
The message "Battery not set" or "Brownout of Battery" is displayed at the lower in the Main Menu screen on the V8/TS series unit.

Purchase a battery and perform battery replacement.
For information on the battery replacement procedure:
The error does not disappear just by replacing the battery. Always format the SRAM area.
For information on the format procedure, click here.
* If Error: 161 (24: x) appears due to a battery voltage drop, all data stored in
SRAM is erased. The data cannot be restored.
The service life of the battery is about 5 years. Replace the battery before the end
of its service life.