E6
Trotec Communication Error Between Display Board and Main PCB

Dehumidifier displays E6; unit may run fan but not dehumidify properly.

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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 communication cable between control panel and main board, Damaged ribbon cable, Oxidized connectors, Faulty display PCB or main PCB

How to Fix / Troubleshooting

Safety: Unplug the unit before removing the control panel or covers.

Steps:

  • Access control panel: Remove the top or front bezel to expose the display/control PCB.
  • Check cable connections: Locate the multi-wire harness or ribbon cable that runs from the display board to the main control board. Ensure both ends are fully seated.
  • Inspect for damage: Look for kinks, cuts, or burn marks on the cable. Replace the cable if any damage is visible.
  • Clean connectors: Use electronic contact cleaner on the plug and socket, then reconnect firmly.
  • Test operation: Reassemble the covers, plug in, and power on. If E6 persists, one of the boards may be defective.
  • Board replacement: Replace the display PCB first (usually easier and cheaper). If that does not resolve the issue, the main PCB likely needs replacement by a qualified technician.
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Repair Difficulty

Medium 3/5

Required Part

Control Panel PCB
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