Dishwasher shows E27, often at the beginning of the cycle; may be accompanied by dim lights or other appliances flickering.

Safety first: Do not operate the dishwasher if you suspect electrical supply problems.

• Check power connection: Ensure the dishwasher is plugged directly into a wall socket, not through an extension cord or multi-plug adapter.
• Test other appliances: If lights flicker or other appliances behave oddly, contact an electrician to check your home's supply voltage.
• Try another outlet: If possible, temporarily connect the dishwasher to a different circuit to see if E27 disappears.
• Internal issues: If supply voltage is confirmed normal, the internal mains filter or control board may be misreading voltage and should be checked by a technician.