- Appliances
- Personal care devices
No fat mass measurement
Withings No fat mass measurement on scale: how to fix it
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
Your Withings scale screen is telling you it could not measure fat mass. Step on barefoot, wipe the surface with a lint-free cloth, stay completely still during the measurement, and check that the scale recognises you and that no mode is switching that measurement off.
Safety first
Stop and check this first
- This message is a device notice and does not replace the opinion of a health professional; do not interpret any scale reading on your own.
- Withings says it does not recommend measuring body composition during pregnancy, because the technique uses limited electric currents; Weight-Only and Pregnancy modes exist for that.
- The Withings guide says not to use the scale with a cardiac pacemaker, an implantable defibrillator or any other implanted electronic device; if you have health doubts, see a doctor.
Safe checks you can perform
- Repeat the reading barefoot and completely still
- Wipe the scale with a cloth and look at the glass
- Check that the scale recognises you
- Review modes, screens, profile and handle in the app
Leave these tasks to a qualified professional
- Do not attempt this professional task: Contact Withings Customer Service
- Do not attempt this professional task: Joint review of profile, modes and screens in the app
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.
Contact Withings Customer Service
What they doWithings customer service takes the case when the message persists after cleaning, weighing in barefoot and still, and reviewing modes and user.
They must show youthe steps already tried and the exact message screen on your model.
In writingthe case number, the scale model and the reply received.
Joint review of profile, modes and screens in the app
What they doWith the technician beside you, the app profile, active modes and composition screens are reviewed before the scale hardware is blamed.
They must show youeach setting reviewed in the app and a test weigh-in after the change.
In writingwhich settings were changed and what the later weigh-in showed.
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.
Repeat the reading barefoot and completely still
- Who:
- you, on the scale itself, without rushing.
- How:
- step on with bare feet well placed on the surface, no socks or shoes, and do not move until the scale finishes. If your feet are very dry, try again after a shower and a light towel dry, as Withings suggests for Body Comp.
- Result that matters:
- that the weigh-in no longer ends with the unmeasured fat mass screen.
- If the reading works:
- the fault was posture, footwear or movement; repeat it with the same routine every time.
- If the message repeats:
- carry on with cleaning the glass and checking user recognition.
- Evidence to keep:
- a photo of the message screen and a note of the exact model (Body+, Body Smart, Body Comp or Body Scan).
Evidence: Body Comp - Body Composition Measurement Error · Body Comp - 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?
Wipe the scale with a cloth and look at the glass
- Who:
- you, with nobody standing on the scale.
- How:
- run a lint-free cloth dampened with water over the measuring surface (warm water for Body Comp and Body Smart); do not use detergents or cleaners, because Withings warns they can cause irreversible damage to the coating over the electrodes. Check whether the glass is scratched.
- Result that matters:
- a clean surface with no marks keeping your foot away from the electrode.
- If it was dirty and now measures:
- keep cleaning it with that cloth and no cleaning products.
- If the glass is scratched or the message stays:
- go on to user and modes, and contact support if nothing changes.
- Evidence to keep:
- a dated photo of the cleaned glass and of any scratch.
Evidence: Body Comp - Body Composition Measurement Error · Body+ - Cleaning your scale · Body Comp - Cleaning your scale · Body Smart - Cleaning your scale
Check that the scale recognises you
- Who:
- you, with your phone to hand and the app open.
- How:
- see whether your name shows on the screen as you weigh in. If you get the user not recognised screen, open the app, find the unknown reading and assign it to the right user. On Body Scan, if several users appear, lean your weight left or right to pick yours.
- Result that matters:
- your name appearing at weigh-in and the reading reaching your profile.
- If it now recognises you:
- fat mass should be measured on the next weigh-in.
- If it does not recognise you on Body Scan:
- Withings asks you to install the scale again with the app.
- Evidence to keep:
- a screenshot of the app with the reading assigned and of the name on the screen.
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 Scan - Body composition failure issues
Review modes, screens, profile and handle in the app
- Who:
- you, with the Withings app open.
- How:
- under Devices, open your scale and check in Modes that Weight-Only and Pregnancy are turned off; on Body Scan also check Customize Screens and always hold the handle when weighing in. Confirm in your profile that height, gender and age are entered correctly.
- Result that matters:
- no mode blocking body composition and a complete profile.
- If a mode was on:
- switch it off and repeat the weigh-in barefoot and still.
- If everything is set up and it still fails:
- contact Withings Customer Service.
- Evidence to keep:
- dated screenshots of the Modes screen and of the profile.
Evidence: Body Comp - Body Composition Measurement Error · Body Scan - Body composition failure issues
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
- Error X Body Compo
- No fat mass measurement
- Withings báscula no mide la grasa
- Withings Body Comp body composition measurement error
- Withings Body Comp error de composición corporal
- Withings Body Smart no fat mass measurement
- Withings Body Smart sin medición de masa grasa
- Withings Body+ no fat mass measurement
- Withings Body+ sin medición de masa grasa
- Withings scale not measuring fat mass
What it means
Withings help articles on the on-screen errors of the Body+, Body Smart and Body Comp explain that the No fat mass measurement screen means the scale was unable to measure fat mass; Body Comp also shows an Error X Body Compo screen, and Body Scan has its own page about body composition failures. Other models may differ and the screen alone does not prove the scale is faulty. It is a device message, not a medical opinion: for any health concern, see a doctor.
Warnings and stop conditions
- Loweditorial warning
This message is a device notice and does not replace the opinion of a health professional; do not interpret any scale reading on your own.
Evidence: Body Comp - An error is displayed on the screen of my scale. What should I do?
- Mediumsource verified
Withings says it does not recommend measuring body composition during pregnancy, because the technique uses limited electric currents; Weight-Only and Pregnancy modes exist for that.
Evidence: Body Comp - Body Composition Measurement Error
- Mediumsource verified
The Withings guide says not to use the scale with a cardiac pacemaker, an implantable defibrillator or any other implanted electronic device; if you have health doubts, see a doctor.
Evidence: Withings Body Comp (WBS12) Guía del usuario / Product Guide · Withings Body Smart (WBS13) Guía del usuario / Product Guide
Symptoms and causes
Probable causes · in order
- Shoes or socks on, very dry feet or poor contactCommon
Withings asks you to step on barefoot and, for Body Comp and Body Scan, warns that feet that are too dry or too wet can stop the composition reading from happening.
Evidence: Body Comp - Body Composition Measurement Error · Body Comp - An error is displayed on the screen of my scale. What should I do? · Body Scan - Body composition failure issues
- Movement or measurement guidelines not followedCommon
The Body Comp page says that moving during the reading, or not following the guidelines closely, is the main reason a body composition measurement fails.
Evidence: Body Comp - Body Composition Measurement Error
- Dirty surface or scratched glassPossible
Withings asks you to keep the scale clean and, for Body Comp, notes that scratched glass can keep the glass electrodes from touching your feet properly.
Evidence: Body Comp - Body Composition Measurement Error · Body Comp - An error is displayed on the screen of my scale. What should I do? · Body+ - Cleaning your scale · Body Comp - Cleaning your scale
- User not recognised by the scalePossible
On the user not recognised screen, Withings says fat mass and heart rate are skipped; the unknown reading must be assigned to the right user in the app.
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?
- Weight-Only mode, Pregnancy mode or screens switched offPossible
Withings says Weight-Only and Pregnancy modes block body composition; on Body Scan you also need the handle and at least one composition screen turned on.
Evidence: Body Comp - Body Composition Measurement Error · Body Scan - Body composition failure issues
Virtual technician
Does No fat mass measurement 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 - Body Composition Measurement Error
Withings · 2022 · official_doc
- 2
Body Comp - An error is displayed on the screen of my scale. What should I do?
Withings · 2022 · official_doc
- 3
Body Smart - An error is displayed on the screen of my scale. What should I do?
Withings · 2023 · official_doc
- 4
Body+ - An error is displayed on the screen of my scale. What should I do?
Withings · 2016 · official_doc
- 5
Body Scan - Body composition failure issues
Withings · 2022 · official_doc
- 6
Withings · 2016 · official_doc
- 7
Body Comp - Cleaning your scale
Withings · 2022 · official_doc
- 8
Body Smart - Cleaning your scale
Withings · 2023 · official_doc
- 9
Withings Body Comp (WBS12) Guía del usuario / Product Guide
Withings · 2022 · official_doc
- 10
Withings Body Smart (WBS13) Guía del usuario / Product Guide
Withings · 2023 · official_doc
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