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Error code reference

KitchenAid Cooktop Error Code U400

Electronics have been connected erroneously at 400V; warning appears when measured voltage on the power grid reaches 280 volts (cases have occurred at 250 volts).

SourceKitchenAid Induction Cooktop - Job Aid: KAC-47 (KICU508SBL, KICU568SBL)p. 6-2

KitchenAid codesKitchenAid 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
1
First diagnostic step
Disconnect the cooktop from the AC line. The failure disappears when the incorrect voltage is corrected.

SourceKitchenAid Induction Cooktop - Job Aid: KAC-47 (KICU508SBL, KICU568SBL)p. 6-2

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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

3 manuals in the MyPros+ library document this code for KitchenAid cooktop.

Models covered by the manuals that document this code

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