E9 displayed; machine may stop mid-cycle, sometimes after a power fluctuation or wiring issue.

Safety first: Disconnect the dishwasher from mains power before accessing the control compartment.

• Power cycle: Leave the machine powered off for several minutes, then restore power. Sometimes transient faults clear after a full reset.
• Inspect control board connections: Remove the front control panel or side cover to access the main PCB. Check all plug-in connectors for secure fit and signs of overheating or corrosion.
• Check supply voltage: Verify that the supply matches the rating on the Hoonved data plate (voltage and phase). Incorrect supply can damage electronics.
• Inspect user interface: On models with a separate display/keyboard PCB, check the ribbon cable or harness between the UI and main board. Reseat or replace if damaged.
• Board replacement: If E9 persists and no wiring issues are found, the main control board is likely defective. Replacement should be carried out by a qualified technician, as programming or configuration may be required.