E6
De'Longhi Internal Communication Error (Display Board to Main PCB)

De'Longhi dehumidifier shows E6 and will not start the fan or compressor.

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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

Loose wiring harness between display board and main PCB, Damaged communication cable, Oxidized connectors, Faulty display PCB or main control PCB

How to Fix / Troubleshooting

Safety first: Unplug the unit before opening the control panel. Avoid static discharge to electronic boards.

Step-by-step:

  • 1. Power reset: Unplug for 5 minutes, then reconnect. If E6 reappears immediately, continue.
  • 2. Access control area: Remove screws securing the top/front panel to expose the display board and main PCB.
  • 3. Check harness connections: Locate the multi-wire cable connecting the display board to the main PCB. Unplug and replug both ends several times to clean contacts.
  • 4. Inspect cable: Look for pinched, cut, or twisted sections. Replace the cable if any damage is visible.
  • 5. Check for moisture or corrosion: If there are signs of condensation or corrosion on the boards, gently clean with a dry brush. Do not use water. Allow everything to dry thoroughly before reassembly.
  • 6. Board substitution: If wiring is intact and E6 persists, either the display PCB or main PCB is defective. Replacement of one or both boards is required and should be done by a technician.
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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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