Not Syncing
Fitbit Fitness Tracker / Smartwatch
Severity: ModerateWhat Does This Error Mean?
Your Fitbit device is not transferring step counts, heart rate, and sleep data to the Fitbit app on your phone. This is almost always a Bluetooth issue, a stale connection, or the Fitbit app needing a refresh. A force-close and reopen of the Fitbit app usually fixes it in seconds.
Affected Models
- Fitbit Charge 6
- Fitbit Versa 4
- Fitbit Sense 2
- Fitbit Inspire 3
- Fitbit Luxe
Common Causes
- Bluetooth is off or unstable on the phone
- Fitbit app is running in the background but not actively syncing
- Phone is too far from the Fitbit device
- Fitbit app needs to be updated
- Fitbit device needs a restart
- Phone battery optimisation is blocking the Fitbit app
How to Fix It
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Force close the Fitbit app on your phone and reopen it.
The Fitbit app sometimes gets stuck and stops actively polling for sync. A fresh open triggers an immediate sync attempt.
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Enable Bluetooth on your phone and bring the Fitbit within 2 metres.
Fitbit syncs over Bluetooth only. Make sure Bluetooth is on and the devices are close — walk to where your Fitbit usually charges if needed.
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In the Fitbit app, tap your device icon at the top left > sync now.
The Fitbit app has a manual sync button. Tapping it forces an immediate sync attempt and usually produces a result within 30 seconds.
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Restart your Fitbit device — the method varies by model, but typically involves pressing and holding the button for 8–10 seconds.
A stuck firmware state can prevent sync. Restarting the Fitbit clears this and makes it available for connection again.
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Update the Fitbit app from your phone's app store.
Outdated Fitbit app versions lose compatibility with current Fitbit firmware. Keeping the app updated ensures reliable syncing.
When to Call a Professional
If your Fitbit has not synced in several days and none of the fixes work, contact Fitbit Support. Data is also stored on Fitbit's cloud servers — missed syncs due to connection issues are usually recovered when syncing resumes.
Frequently Asked Questions
How often does Fitbit sync automatically?
When Bluetooth is on and the Fitbit app is open (or recently used), syncing happens roughly every 15 minutes automatically. Opening the Fitbit app triggers an immediate sync. Overnight when the app is in the background, sync may be less frequent depending on your phone's battery settings.
Will I lose my Fitbit data if it doesn't sync for a few days?
Fitbit devices store data locally for 7 days. All stored data syncs automatically when the connection is restored. However, if more than 7 days pass without a sync, the oldest data may be overwritten.