Fat Mass + Lean Mass Measurements

Have you tried contacting the Withings Customer Support? If you haven't done so, you can reach out to them by following this link https://support.withings.com/hc/en-us/requests/new. They will be able to help.

I have the same issue, and looking across the fora plenty of others do too. I will send a Note to Withings via the link, but given the widespread nature of this issue I would have thought that if there is a solution they should look to use a forum to let users know what it is.

Same here. Have sent a request and will see what they say.

I too had this problem - the fix was pretty easy. It won't do lean/fat mass if the batteries are low. Try fresh batteries.

Will change them. They are on 33% so would have thought that's ok....

Mine were at ~33% too. Like the OP, I have had this scale since 2010 or so, with 0 problems. Then I get this issue with the fat/lean mass readings. I called and spoke with one of their programmers who connected remotely to the device (as I recall), and said the relatively low battery was the issue. I thought it was a lazy answer... then I changed the batteries.

Its back up to speed.

I'm not sure why it suddenly doesn't work when the batters are lower than a third or so. That is a new issue.