Casio F-108W-B100W Bluetooth Pairing Troubleshooting

This guide walks you through fixing Bluetooth pairing and syncing problems on the Casio F-108W-B100W (often marketed as the F-108W with Bluetooth). You’ll learn the exact steps to pair the watch with your phone, what to do when the connection drops, and how to resolve common sync failures. Before starting, make sure your watch has a fresh battery, your phone’s Bluetooth is on, and the Casio Watches app is installed from your app store.

What You’ll Need

• Your Casio F-108W-B100W watch
• A smartphone (iOS or Android) with Bluetooth enabled
• The Casio Watches app (free from the App Store or Google Play)
• Your phone’s location services turned on (required for Android Bluetooth scanning)
• Access to the watch’s settings menu (via the crown/button)

Step-by-Step

1. Prepare the watch: Ensure the watch is in normal timekeeping mode (press the bottom-left button until the time appears). If the battery is low, replace it before attempting to pair.
2. Enable pairing mode on the watch: Press and hold the bottom-right button (usually labeled “ADJUST” or “SET”) for about 3 seconds until the seconds hand or the display shows a Bluetooth icon (a small “BT” or a phone symbol). The watch is now discoverable.
3. Open the Casio Watches app: Launch the app on your phone. If prompted, allow notifications and location permissions.
4. Start pairing in the app: Tap the “Pair” or “Add Device” button (usually a plus icon). The app will start scanning for nearby devices.
5. Select your watch: When the watch appears in the list (it may show as “CASIO F-108W” or a similar name), tap it. The app will send a pairing request to the watch.
6. Confirm on the watch: The watch will display a confirmation prompt (often a checkmark or a “YES”). Press the top-right button to accept. The watch will vibrate or show a success message.
7. Wait for sync: The app will now sync the time and settings. This may take 10–30 seconds. Once complete, the Bluetooth icon on the watch will stop blinking and remain solid (or disappear, depending on the model).
8. Test the connection: Change the time on your phone, then manually trigger a sync in the app (usually a refresh button). The watch time should update within a minute.

Common Mistakes

• Not putting the watch in pairing mode: Simply having the watch near the phone is not enough. You must hold the bottom-right button to enter pairing mode.
• Phone Bluetooth already connected to another device: If your phone is connected to a smartwatch or earbuds, the watch may not appear. Disconnect other Bluetooth devices first.
• Android location services off: Android requires location services to scan for Bluetooth Low Energy devices. If pairing fails, check that Location is on.
• App not updated: An outdated Casio Watches app may not recognize the F-108W. Update the app from your app store.
• Forgetting to confirm on the watch: If you don’t press the confirm button on the watch within 30 seconds, pairing times out.

Tips

• Keep the watch and phone within 3 feet (1 meter) of each other during pairing.
• If the watch has a battery saver mode, disable it temporarily during pairing.
• After a successful sync, the watch will automatically sync several times a day. You can also manually sync by opening the app and pulling down to refresh.
• If you have multiple Casio watches, give each a distinct name in the app to avoid confusion.

Troubleshooting

If pairing still fails, try these in order:

1. Restart both devices: Turn off the watch (if possible) and restart your phone. Then try again.
2. Forget the watch in the app: In the Casio Watches app, go to the device settings and select “Remove” or “Forget”. Then repeat the pairing process from scratch.
3. Reset the watch’s Bluetooth: On the watch, hold the bottom-right button for 10 seconds until the Bluetooth icon flashes rapidly. This clears the pairing memory. Then try pairing again.
4. Check battery level: A low battery can cause intermittent Bluetooth issues. Replace the battery (CR2025 or similar) if needed.
5. Update the app: Go to your app store and check for updates. If an update is available, install it and retry.
6. Reset the watch to factory defaults: If all else fails, reset the watch (usually via the app’s settings or by holding the reset button on the watch). This will erase all settings, so you’ll need to set them up again.
7. Contact Casio support: If the watch still won’t pair, the Bluetooth module may be faulty. Check your warranty and contact Casio support for further assistance.

Frequently Asked Questions

Why won’t my Casio F-108W-B100W show up in the app?

Make sure the watch is in pairing mode (hold the bottom-right button until the Bluetooth icon appears). Also, ensure your phone’s Bluetooth is on and, for Android, location services are enabled.

How do I know if my watch is connected?

When connected, the Bluetooth icon on the watch will be solid (not blinking). In the app, the device status will show “Connected”.

Can I pair the watch with multiple phones?

No, the watch can only be paired with one phone at a time. To switch phones, you’ll need to unpair from the current phone and then pair with the new one.

Why does my watch sync time but not other settings?

Some settings, like alarms or world time, may need to be manually enabled in the app. Check the app’s settings to ensure all sync options are turned on.

Does the watch work with iPhones and Android?

Yes, the F-108W-B100W works with both iOS 13+ and Android 6.0+ via the Casio Watches app.

How often does the watch sync automatically?

The watch attempts to sync automatically every 6 hours, but you can also sync manually anytime by opening the app and tapping the refresh icon.

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