The most common reason for impedance failure is poor contact between the feet and the metal electrodes.
On newer Tanita models (RD series, BC-730), a small "lock" icon or solid person icon appears when weight stabilizes. If you step off before this icon appears, Error 7 will show. Wait for the scale to beep or flash twice. tanita scale error 7 new
Newer digital scales are sensitive to static. The most common reason for impedance failure is