Thermometer No Longer Works

It can be possible that the Thermo is not working because of low batteries. You can replace it with new batteries and see if the issue is still the same. You can contact the support at https://support.withings.com/hc/en-us/requests/new if the issue persists.

My Thermo also stopped working after about two years. Battery replacement does not resolve the issue.

My Thermo stopped working after two years. Says go to this website. I changed the batteries with no luck. Still says come to this site. Why? There are no answers.

This indicates that you need to reinstall your Thermo. Before reconfiguring it, you have to dissociate it first from your account by following the steps on this link https://support.withings.com/hc/en-us/articles/222417147-Dissociating-my-Thermo then forget it from the Bluetooth settings of your phone. You can then install it by following the steps outlined in this article https://support.withings.com/hc/en-us/articles/222420347.

That worked perfectly. Thank you for your help. I did not have to delete the app but I did have to “pretend” like I had a new thermometer and instruct the new thermometer how to interact with my wifi. 
thank you for your assistance.

I had the same issue where the Thermo no longer worked after a battery replacement.

But for some reason removing it from the Thermo app, dissociating it from my iPhone's bluetooth settings and adding it again.. it worked. Bit strange, but happy to have a working thermometer again.