Bosch Cooktop / Rangetop U400 Error Code

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What it means

The cooktop detected incorrect electrical supply voltage.

Try this first

Turn the cooktop off.
Do not continue using it if the supply connection may be incorrect.
Have the electrical supply checked by a qualified electrician.

Can I keep using it?🔴 Electrical supply fault

Repair usually required?🔴 Electrician may be required

If the error keeps returning

If U400 returns after troubleshooting, Bosch recommends customer support or qualified service.

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.

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Bosch Cooktop / Rangetop U400: Quick Answer

What it means: The cooktop detected incorrect electrical supply voltage.

First thing to check

Turn the cooktop off.

Can I keep using it?

Electrical supply fault

Repair outlook

Electrician may be required

If the code remains

If U400 returns after troubleshooting, Bosch recommends customer support or qualified service.

Model note: Error-code meanings and procedures can vary by model and model year. Confirm the code against the documentation for your exact appliance before replacing parts.

Manufacturer reference: bosch-home.com