Thermador U400 error code

The zone can’t detect compatible cookware — confirm the pan is induction-ready and centred; if correct cookware still fails, the coil sensing needs checking.

Because a code points to a likely area rather than an exact part, we run a full on-site diagnosis to confirm the real cause — testing the components above and the wiring and controls behind them. You get a clear, flat-rate quote before any work begins, and most U400 faults are resolved on the first visit with quality parts and a parts-and-labor warranty.