- Appliances
- Personal care devices
Synchronization issue
Withings Synchronization issue on scale: app not syncing
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
The Synchronization issue screen means the Withings scale could not send the reading to the app. Check that the router broadcasts on 2.4 GHz, the password is right, bring the scale closer to the router and update the Wi-Fi configuration if you changed the network name or password.
Safety first
Stop and check this first
- The Withings guides recommend securing the phone with a code or fingerprint because it stores personal health data; this message does not replace a medical opinion, and for any health doubt you should see a doctor.
- Withings advises using a trusted Wi-Fi network with the scale rather than an unknown public one; do not change router security in a way that leaves the network unprotected.
Safe checks you can perform
- Review band, password and router state
- Move the scale closer and try again
- Update the scale Wi-Fi configuration
- Router settings: security, standard and MAC filter
- Sync over Bluetooth and restart the scale
Leave these tasks to a qualified professional
- Do not attempt this professional task: Re-set the scale Wi-Fi from the app
- Do not attempt this professional task: Manual IP and DNS setup for DHCP or DNS errors
- Do not attempt this professional task: Remote diagnostic with Withings Support
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.
Re-set the scale Wi-Fi from the app
What they doThe technician walks you through the app flow that updates the Wi-Fi configuration and picks the right 2.4 GHz network.
They must show youthe QR code with the Open Withings App message on the screen and the reading arriving in the app.
In writingthe network and band chosen and the result of the test weigh-in.
Manual IP and DNS setup for DHCP or DNS errors
What they doIf the Wi-Fi guide points to a DHCP or DNS error after a router restart, the scale moves to manual configuration using the phone network values and the DNS given.
They must show youthe manual configuration fields filled in with the phone values.
In writingthe values entered and whether the scale completed the connection.
Remote diagnostic with Withings Support
What they doIf nothing above connects the scale, Withings Support can run a remote diagnostic test on the device.
They must show youthe network steps already tried and the scale model.
In writingthe case number and the outcome of the remote test.
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.
Review band, password and router state
- Who:
- you, with access to the router settings.
- How:
- confirm the router broadcasts a visible 2.4 GHz network, restart it if you have not recently, and check that other devices get Wi-Fi. Type the password carefully, since it is case-sensitive, and avoid accents or odd symbols in the network name while testing.
- Result that matters:
- the scale seeing the 2.4 GHz network and accepting the password.
- If the network shows and takes the password:
- weigh in again and see whether the message goes away.
- If the network is missing from the list:
- move the phone and scale closer to the router and refresh the list in the app.
- Evidence to keep:
- a note of the router band and a screenshot of the network list in the app.
Evidence: Body Comp - An error is displayed on the screen of my scale. What should I do? · Scales - Wi-Fi Connection Issues
Move the scale closer and try again
- Who:
- you, with the scale and router in sight.
- How:
- place the scale nearer the router and weigh in to force the sync. Check that your model appears in the device list of the Withings app, that the batteries or battery level are fine according to your model manual, and restart the phone.
- Result that matters:
- the scale sending the reading to the app with no sync screen.
- If it syncs when closer:
- range was the issue; look for a spot with a better signal.
- If it still does not sync:
- go on to updating the scale Wi-Fi configuration.
- Evidence to keep:
- a photo of the spot that worked and the approximate distance to the router.
Evidence: Body Comp - An error is displayed on the screen of my scale. What should I do? · Body Smart - An error is displayed on the screen of my scale. What should I do? · Body+ - An error is displayed on the screen of my scale. What should I do? · Withings Body Comp (WBS12) Guía del usuario / Product Guide · Withings Body Smart (WBS13) Guía del usuario / Product Guide
Update the scale Wi-Fi configuration
- Who:
- you, with the phone and the Withings app.
- How:
- on Body Smart, open Devices, pick your scale, scroll to Advanced Settings and tap Update Wi-Fi Configuration; hold the button on the top of the scale for 3 seconds until the screen shows a QR code and the message Open Withings App, then follow the app. Body+ and Body Comp have their own Withings articles.
- Result that matters:
- the scale linked to the current network and syncing when you weigh in.
- If the screen takes the new network:
- weigh in and confirm the reading reaches the app.
- If it fails again:
- review router security and try Bluetooth sync.
- Evidence to keep:
- a screenshot of the app after the update and a note of the network chosen.
Evidence: Body Comp - An error is displayed on the screen of my scale. What should I do? · Body Smart - An error is displayed on the screen of my scale. What should I do? · Body Smart - Updating the scale's Wi-Fi configuration
Router settings: security, standard and MAC filter
- Who:
- you, in the router panel, or whoever manages it.
- How:
- check that security is not WPA3-only (Withings supports WPA2 or mixed), that the standard is not Wi-Fi 6 (802.11ax) exclusive and that the network name is not hidden. If MAC address filtering is on, add the scale address, shown in the app under My Devices, Device Info.
- Result that matters:
- the router accepting scale connections with that security and no filter blocking it.
- If changing the mode fixes it:
- keep a note of the setting that worked.
- If there is no filter or exclusive mode and it still fails:
- move on to Bluetooth sync.
- Evidence to keep:
- screenshots of the router settings before and after, with no passwords shown.
Evidence: Scales - Wi-Fi Connection Issues
Sync over Bluetooth and restart the scale
- Who:
- you, with the phone next to the scale.
- How:
- in the app, go to My Devices, your scale and Synchronization mode, and choose Bluetooth; the phone must be nearby when you weigh in. On Body Smart, the user guide says to restart the scale by holding its button for 20 seconds, and to restart the phone if needed.
- Result that matters:
- the reading reaching the app even though Wi-Fi does not connect.
- If it syncs over Bluetooth:
- that works, though Withings warns some advanced features may not be available.
- If it does not sync over Bluetooth either:
- contact Withings Support.
- Evidence to keep:
- a screenshot of the sync mode chosen and of the reading received.
Evidence: Scales - Wi-Fi Connection Issues · Withings Body Smart (WBS13) Guía del usuario / Product Guide
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
- Appliances
- Brand
- Withings
- Product type
- Personal care devices
Known code variants
- Synchronization issue
- Withings báscula no sincroniza
- Withings báscula wifi no conecta
- Withings Body Comp no sincroniza con la app
- Withings Body Comp not syncing with the app
- Withings Body Smart no se conecta al wifi
- Withings Body Smart will not connect to Wi-Fi
- Withings Body+ problema de sincronización
- Withings Body+ synchronization issue
- Withings scale not syncing
- Withings scale Wi-Fi not connecting
What it means
Withings articles on the on-screen errors of the Body+, Body Smart and Body Comp, plus their guide to scale Wi-Fi connection problems, explain that this screen means the scale was unable to sync with the app. The Body Comp and Body Smart user guides give similar steps. Other models may differ and the screen alone does not prove the scale or the router is faulty. The data you sync is personal; with any health doubt, see a doctor.
Warnings and stop conditions
- Mediumeditorial warning
The Withings guides recommend securing the phone with a code or fingerprint because it stores personal health data; this message does not replace a medical opinion, and for any health doubt you should see a doctor.
Evidence: Withings Body Smart (WBS13) Guía del usuario / Product Guide
- Loweditorial warning
Withings advises using a trusted Wi-Fi network with the scale rather than an unknown public one; do not change router security in a way that leaves the network unprotected.
Evidence: Withings Body Smart (WBS13) Guía del usuario / Product Guide
Symptoms and causes
Probable causes · in order
- Wi-Fi network the scale cannot useCommon
Withings says its scales only support 2.4 GHz networks, not 5 GHz or 6 GHz, and are not compatible with WPA3-only, Wi-Fi 6-only mode or hidden networks.
Evidence: Scales - Wi-Fi Connection Issues
- Network name or password changedCommon
Withings asks you to update the scale Wi-Fi configuration if you recently changed the network name or password, and warns that even one wrong character in the key causes a failure.
Evidence: Body Comp - An error is displayed on the screen of my scale. What should I do? · Body Smart - An error is displayed on the screen of my scale. What should I do? · Scales - Wi-Fi Connection Issues
- Scale too far from the routerPossible
The Withings pages ask you to check the scale is close enough to the router and to move it if needed, to see whether connectivity changes.
Evidence: Body Comp - An error is displayed on the screen of my scale. What should I do? · Body Smart - An error is displayed on the screen of my scale. What should I do? · Body+ - An error is displayed on the screen of my scale. What should I do? · Withings Body Comp (WBS12) Guía del usuario / Product Guide
- Low batteries or battery affecting BluetoothPossible
For Body Comp and Body Smart, Withings warns that a low battery can temporarily cause Bluetooth connection problems, so the charge level is worth a look.
Evidence: Body Comp - An error is displayed on the screen of my scale. What should I do? · Body Smart - An error is displayed on the screen of my scale. What should I do?
- Router MAC filter or address assignment faultLess common
The Withings Wi-Fi guide lists MAC address filtering and DHCP or DNS errors among the reasons the scale cannot finish connecting to the network.
Evidence: Scales - Wi-Fi Connection Issues
Virtual technician
Does Synchronization issue 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
Body Comp - An error is displayed on the screen of my scale. What should I do?
Withings · 2022 · official_doc
- 2
Body Smart - An error is displayed on the screen of my scale. What should I do?
Withings · 2023 · official_doc
- 3
Body+ - An error is displayed on the screen of my scale. What should I do?
Withings · 2016 · official_doc
- 4
Scales - Wi-Fi Connection Issues
Withings · 2026 · official_doc
- 5
Body Smart - Updating the scale's Wi-Fi configuration
Withings · 2023 · official_doc
- 6
Withings Body Comp (WBS12) Guía del usuario / Product Guide
Withings · 2022 · official_doc
- 7
Withings Body Smart (WBS13) Guía del usuario / Product Guide
Withings · 2023 · official_doc
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