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Bosch
Cooktop
Data independently verified by Elite B2B Technicians
Diagnostic Complet

Error Code U400 Bosch

Symptom / Description

U400 displayed statically, continuous loud signal

Root Cause

Incorrect connection of the cooktop to 400V instead of 230V, internal wiring error, or mains voltage exceeding maximum permissible level (e.g., >275V).

Repair Instructions

UNLOCKED

Immediately disconnect the cooktop from the mains, correct wiring. Ensure mains voltage does not exceed 255V. Error extinguishes after correction.

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