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://s.casio.jp/w/10016en/

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 the restart procedure, see Restarting.

If you cannot pair after changing to another phone model

The information below also applies when changing from one paired phone model to another.

Android Phone and iPhone Users

Only one phone can be paired with the watch at a time. If you want to pair the watch with a different phone, you first need to unpair it from the existing phone.

To unpair from a phone, perform the procedure under Returning the Watch to Its Initial Factory Defaults.

iPhone Users

With an iPhone, you can have only one watch paired per phone. If you want to pair this watch back with a phone or pair this watch with an iPhone that is already paired with another watch, first perform the procedure below on the phone to delete the current watch’s pairing information from the phone, and then pair with this watch.

  1. On your iPhone home screen, tap the following in sequence: “Settings” > “Bluetooth”.

  2. In the “MY DEVICES” list, tap the icon_iphone_GSW-H1000 mark to the right of the name of the currently connected Wear OS by Google watch.

  3. Tap “Forget This Device”.

  4. Start up the Wear OS by Google app.

  5. Tap the menu icon (icon_menu1_GSW-H1000) in the upper left corner of the screen. On the menu that appears, tap “Set up a new watch”.

    6. Now, follow the instructions that appear on your phone screen to complete the pairing procedure.

Returning the Watch to Its Initial Factory Default State

Resetting the watch to its initial factory defaults unpairs it from its currently paired phone. It also initializes (deletes) all data (activity measurement history records, installed apps, etc.) that you have stored in watch memory, and resets any settings configured by you.

  1. While a watch face is displayed swipe the screen from top to bottom.

  2. Tap the following in sequence: icon_SmartPuls_settings > “System”.

  3. Tap “Disconnect and reset”.

    4. When a confirmation screen appears, scroll the screen downwards to read its contents.

  4. Tap icon_check_BL_GSW-H1000.

    5. To cancel the operation, tap Batsu.

Error Code and Error Message List

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. Be sure to use the charger cable that comes with the watch to charge it as described under STEP 1: Charge the watch.

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, gyrometer, 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 icon_SmartPuls_settings, “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 goes white.

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.