- Phones and tablets
- Smartwatches
Connection fails during data sync
Amazfit Connection fails during data sync: watch not syncing
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
If the Zepp app does not sync your Amazfit Balance 3, swipe down on the Zepp home screen, then force close the app and reopen it. Amazfit warns that data will not sync while the watch is recording a workout or playing music.
Safety first
Stop and check this first
- A sync failure while the watch records a workout or plays music is the behaviour Amazfit describes, not a fault: wait until the activity ends before judging the watch.
Safe checks you can perform
- Confirm Bluetooth and the Zepp app are on and force a sync
- Force close the Zepp app and open it again
- Stop the watch workout and music before syncing
- Restart the watch with the BACK button as the Balance 3 manual says
Leave these tasks to a qualified professional
- Do not attempt this professional task: Force restart the watch and repeat the sync
- Do not attempt this professional task: Sync with the watch idle and check the system version
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Force restart the watch and repeat the sync
What they doAs a last step before escalating, the technician holds the BACK button for five seconds or longer per the manual, lets the watch restart and syncs again with the Zepp app.
They must show youthe restart page on the watch screen and the Zepp app showing the watch connected afterwards.
In writingresult of the sync after the restart plus the Zepp app version and phone model used.
Sync with the watch idle and check the system version
What they doThe technician repeats the manual sync with the Zepp app while the watch is not recording or playing anything and checks Device > Amazfit Balance 3 > General > Update for a pending watch update.
They must show youthe Update screen of the watch in the app and the idle watch with no workout or music during the sync.
In writingsystem version before and after, and whether the update finished with the watch connected.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Confirm Bluetooth and the Zepp app are on and force a sync
- Who:
- you, with the phone unlocked next to the watch.
- How:
- check that the phone's Bluetooth is on, open the Zepp app and swipe down on its home screen to start a manual sync.
- Result that matters:
- see whether the manual sync works when the automatic one does not start.
- If the data refreshes on the Zepp home screen:
- the link works and nothing more is needed.
- If the home screen does not refresh after swiping:
- close the app completely.
- Evidence to keep:
- screenshot of the Zepp home screen before and after swiping down.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
Force close the Zepp app and open it again
- Who:
- you, from the phone's app switcher.
- How:
- close the Zepp app from the recent apps list, wait a few seconds, open it again and repeat the swipe down with the watch nearby.
- Result that matters:
- rule out an app that hung and no longer talks to the watch.
- If the app shows the watch connected again and updates the data:
- sync recovered.
- If the connection error remains after reopening:
- check whether the watch is in a workout or playing music.
- Evidence to keep:
- screenshot of the connection status the Zepp app shows after reopening.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
Stop the watch workout and music before syncing
- Who:
- you, with the watch on your wrist or in hand.
- How:
- end or save any workout in progress, stop music playing from the watch and repeat the sync from the Zepp app while the watch sits idle.
- Result that matters:
- remove the cause Amazfit names most clearly: a watch busy recording or playing.
- If once the activity stops the data reaches the app:
- the watch was simply busy and nothing is faulty.
- If it still fails with the watch idle:
- try the forced restart the manual describes.
- Evidence to keep:
- photo of the idle watch screen (no workout, no music) and of the app after the sync.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
Restart the watch with the BACK button as the Balance 3 manual says
- Who:
- you, with the Balance 3 and a charger nearby in case the battery is low.
- How:
- press and hold the BACK button for five seconds or longer; the manual says this powers on, opens the restart page and performs a force restart. Then open Zepp and sync.
- Result that matters:
- rule out a frozen watch after the FAQ steps have been used up.
- If the watch restarts and the app finds it and syncs:
- it was a temporary freeze.
- If the sync still fails after the restart:
- note what was tried and contact Amazfit support.
- Evidence to keep:
- note with the time of the restart and app screenshots before and after.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Phones and tablets
- Brand
- Amazfit
- Product type
- Smartwatches
Known code variants
- Amazfit watch data not syncing
- Connection fails during data sync
- Falla la conexión al sincronizar los datos
- La app Zepp no sincroniza el reloj Amazfit
- Sincronización fallida con la app Zepp
- What should I do if the connection fails
- Zepp app does not sync Amazfit data
What it means
In the official Amazfit FAQ for the Balance 3 (support.amazfit.com) the question about syncing data and what to do if the connection fails recommends a manual sync and closing and reopening the app. The manual for the same model adds that a detected workout can block part of the sync. Other models may differ, and a sync failure never proves by itself that the watch is faulty.
Warnings and stop conditions
- Lowsource verified
A sync failure while the watch records a workout or plays music is the behaviour Amazfit describes, not a fault: wait until the activity ends before judging the watch.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
Symptoms and causes
Probable causes · in order
- Phone Bluetooth or Zepp app not switched onCommon
Automatic synchronisation only starts when the phone's Bluetooth and the Zepp app are both turned on, according to the Balance 3 FAQ.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
- Watch recording a workout or playing musicCommon
The note on the official page says the app cannot send data to the watch while it records workout activities or plays music.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
- Stuck Zepp app that needs a full closePossible
If swiping down is not enough, Amazfit asks you to force close the Zepp app and reopen it before looking for any other cause.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
- Automatic workout detection runningPossible
The Balance 3 manual says that when the watch detects an ongoing workout, some data cannot be synchronized with the app at that moment.
Evidence: Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3) · Amazfit Balance 3 User Manual (Global Version)
Virtual technician
Does Connection fails during data sync still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Zepp Health (Amazfit Support) · 2026 · official_doc
- 2
Amazfit Support: How do I sync data? What should I do if the connection fails? (Amazfit Balance 3)
Zepp Health (Amazfit Support) · 2026 · official_doc
- 3
Amazfit Balance 3 User Manual (Global Version)
Zepp Health (Amazfit Support) · 2026 · official_doc
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