E27
Neff Mains voltage out of range

Dishwasher intermittently shows E27, often at start or during heating; may coincide with household voltage issues.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Low or unstable mains voltage, Incorrect supply frequency, Loose mains connection at terminal block, Faulty mains filter module

How to Fix / Troubleshooting

Safety: Only qualified persons should work on mains connections. Disconnect power before opening any electrical covers.

E27 indicates that the supply voltage is outside the acceptable range.

  • Check household supply: Use a multimeter to verify that the mains voltage at the outlet is within Neff's specified range (typically 220–240 V AC). If not, consult an electrician.
  • Inspect mains cable and terminal: Access the mains terminal block and mains filter module. Tighten any loose connections and look for signs of overheating.
  • Check mains filter: If the filter is burnt or cracked, replace the Neff mains interference filter.
  • Avoid extension leads: Plug the dishwasher directly into a suitable wall outlet.

If voltage is stable and E27 persists, the control module may be misreading supply and require replacement.

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Repair Difficulty

Hard 4/5

Required Part

Mains Interference Filter
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