ERROR CODE EXPLAINED
Thermador Induction Cooktop
Thermador Induction Cooktop U400 Error Code
What it means
The electrical supply voltage is outside the normal operating range.
Try this first
- Stop using the cooktop.
- Have the household electrical supply checked.
Can I keep using it?🔴 Supply-voltage fault
Repair usually required?🔴 Electrician may be required
If the error keeps returning
If the condition returns after troubleshooting, qualified service may be required.
Official source
Troubleshooting information verified against manufacturer support documentation.
View manufacturer support page →Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.