What U400 Means
Documented on both platforms, identically to E9000/E9010, as the supply voltage being outside the cooktop's normal operating range.
Common Causes of U400
- A home electrical supply voltage issue
- An incorrectly wired circuit for the cooktop
🔧 One Safe Check You Can Try
This points to the incoming electrical supply, not something to troubleshoot at the cooktop.
⚠ Why You Shouldn't Go Further Than That
- Confirming supply voltage requires an electrician or the utility provider, not appliance-side repair.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.