Bosch Cooktop / Rangetop U400 Error Code

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What it means

Bosch says U400 indicates an electrical supply or connection problem.

Try this first

Have the supply voltage and appliance connection checked by a qualified professional according to the circuit diagram.

Can I keep using it?⚠ Bosch says U400 indicates an electrical supply or connection problem.

Repair usually required?⚠ Follow only the manufacturer-backed checks listed on this page before replacing parts.

If the error keeps returning

Use the linked official manufacturer support source for additional model-specific guidance.

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: Bosch says U400 indicates an electrical supply or connection problem.

First thing to check

Have the supply voltage and appliance connection checked by a qualified professional according to the circuit diagram.

Can I keep using it?

Bosch says U400 indicates an electrical supply or connection problem.

Repair outlook

Follow only the manufacturer-backed checks listed on this page before replacing parts.

If the code remains

Use the linked official manufacturer support source for additional model-specific guidance.

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