E6
De'Longhi
Communication Error Between Indoor and Outdoor PCB (for split systems) or Internal PCB Communication Fault
Display shows E6 and the unit will not run in COOL or HEAT.
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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 indoor and outdoor units, Damaged communication wiring, Faulty indoor PCB, Faulty outdoor PCB
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker and verify no voltage is present before touching wiring.
- 1. Inspect communication cable: On De'Longhi split systems, locate the multi-core cable between indoor and outdoor units. Check for cuts, rodent damage, or loose terminals at both ends.
- 2. Tighten terminals: Ensure all screws on the terminal blocks are snug. Loose connections can cause intermittent E6 errors.
- 3. Check polarity and wiring order: Verify that the wire colors and terminal numbers match exactly between indoor and outdoor units as per the wiring diagram.
- 4. Power cycle: After confirming wiring, restore power and leave the system off for 5 minutes, then restart.
- 5. PCB diagnosis: If E6 persists, either the indoor or outdoor PCB may be defective. A technician should test voltages and signals and replace the faulty board.
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Repair Difficulty
Professional Required
5/5
Required Part
Indoor-Outdoor Communication Cable
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