Error code reference

Thermador Cooktop Error Code U400

Electronics have been connected erroneously at 400V (warning appears when measured voltage on power grid reaches 280V or sometimes at 250V).

SourceThermador Induction Cooktop - Full Service Manual: CIT365DSp. 48

Thermador codes Thermador cooktop codes

Diagnostic procedure

The full U400 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Disconnect the cooktop from the power grid. The failure disappears when the incorrect voltage is corrected.

SourceThermador Induction Cooktop - Full Service Manual: CIT365DSp. 48

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

2 manuals in the MyPros+ library document this code for Thermador cooktop.

Models covered by the manuals that document this code

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The full U400 procedure

Where this code is documented

Models covered by the manuals that document this code

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