E6
Keystone
Communication Error Between Display Board and Main Control Board
Dehumidifier displays E6 and will not operate normally; may beep repeatedly.
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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 or damaged wire harness between user interface (display) board and main PCB, oxidized connectors, failed display/control panel board, failed main control board
How to Fix / Troubleshooting
Safety: Unplug the dehumidifier before opening the cabinet or touching any internal wiring.
How to troubleshoot E6:
- Power reset: Unplug for 5–10 minutes, then reconnect. If E6 reappears, continue.
- Access control boards: Remove the front/top cover to expose the display board and the main control board (usually mounted on the side or behind the front panel).
- Inspect harness: Locate the multi-wire harness connecting the display board to the main PCB. Check for pinched, cut, or burned wires.
- Reseat connectors: Disconnect the harness at both ends and reconnect firmly to ensure good contact.
- Check for corrosion or moisture: If you see signs of water intrusion on the boards, dry the area thoroughly and consider replacing the affected board.
- Board replacement: If wiring is intact and E6 persists, either the display/control panel board or the main control board is defective. Replace the less expensive display board first; if that does not resolve it, the main board will likely need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Display Control Board
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