E6
Haier
Communication Failure Between Indoor and Outdoor Units
Indoor unit displays E6 and the system does not respond properly; compressor and outdoor fan may not start.
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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
Open or shorted communication cable between indoor and outdoor, Reversed polarity on terminal connections, Faulty indoor PCB communication circuit, Faulty outdoor PCB communication circuit
How to Fix / Troubleshooting
Safety first: Turn off power to both indoor and outdoor units at the breaker before touching any wiring.
- Inspect communication cable: Locate the multi-core cable between indoor and outdoor units. Check for cuts, rodent damage, or crushed sections. Replace if damaged.
- Verify terminal connections: Open the terminal covers on both units. Confirm that terminals (e.g., 1-2-3 or L-N-S) are wired identically at both ends and screws are tight. Correct any miswiring.
- Check for corrosion: Look for rust or moisture on terminal blocks. Clean lightly and dry the area; reseal cable entries to prevent water ingress.
- If E6 persists: Either the indoor or outdoor PCB communication circuit may be defective. A technician can test signal voltages and replace the faulty board.
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Repair Difficulty
Medium
3/5
Required Part
Indoor-Outdoor Communication Cable
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