Troubleshooting

Refer to this section whenever you are experiencing problems with watch operation.

If you don’t find the solution to your problem here, visit the website below.
https://support.casio.com/en/support/faq.php?cid=019

Restoring Watch Operation

If you find yourself unable to obtain proper operation from the watch for some reason, restart it and then try performing the operation again. For information about restarting the watch, visit the website below.
https://support.google.com/wearos/

If the watch will not restart...

Perform the procedure below to force it to shut down. After the watch is forced to shut down, it will restart automatically.

1.Hold down the power button until the display goes blank.

Wait for a while until the watch restarts automatically.

Error Code and Error Message List

If an error code or error message appears on your watch, look it up in the table below and take the required action.

Error Code Error Message	Required Action
1001, 1009 Normal charging is not possible for some reason. If this message keeps appearing, request servicing.	Remove the charger cable from the watch, turn off the watch, and then try charging again. Use only the AC adaptor and charger cable that comes with the watch for charging. If this message/error code keeps appearing, it could mean that the chargeable battery has deteriorated. Request servicing by your original retailer or an authorized CASIO Service Center.
1003 Too cold to charge.	Charge the watch in an area where the ambient temperature is between 10°C and 35°C (50°F and 95°F).
1004, 1007 Too hot to charge.
1021 Data acquisition from the sensor may have failed. Use the Settings screen to perform a System Restart operation.	Data acquisition from one of the following sensors may have failed for some reason: pressure sensor, accelerometer, gyro sensor, magnetic sensor, optical sensor (PPG Heart Rate). Restart the watch by performing the following steps: To restart, swipe the watch face from top to bottom. On the screen that appears, tap, “System”, and then “Restart”. If this message/error code keeps appearing after restart, request servicing by your original retailer or an authorized CASIO Service Center.
9000 Some problem occurred with the watch. Power will turn off shortly.	To restart the watch, first charge it for at least one hour. Next, hold down the power button for about 12 seconds until the display color changes.
9001, 9002, 9003 Some problem occurred with the watch. Power will turn off shortly.	Take your watch to an authorized CASIO Service Center or to your original retailer for inspection and repair.
9010 Watch temperature is high. Power will turn off to protect it.	Remove the watch from your wrist and leave it in a location that is not exposed to direct sunlight, where the temperature is between 10°C and 30°C (50°F and 86°F) to allow the watch to cool down. You will be able to turn the watch on again after it reaches a lower temperature.