E7
Haier
Mode Conflict / Indoor-Outdoor Mode Mismatch
Indoor unit shows E7 and the system may not operate in the selected mode or may shut down.
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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
Incorrect mode signal from indoor PCB, Faulty outdoor PCB mode control, Communication data error, Incorrect wiring on multi-split system
How to Fix / Troubleshooting
Safety first: Turn off the unit and isolate power before opening any covers.
- Reset system: Turn off power at the breaker for 5–10 minutes, then restore power and reselect the desired mode (cool, heat, auto) on the remote.
- Check remote settings: Ensure only one mode is selected and that no conflicting commands (e.g., multiple indoor units demanding different modes on a multi-split) are present.
- Inspect wiring (multi-split): Verify that each indoor unit is correctly wired to its designated outdoor ports according to the Haier wiring diagram.
- If E7 continues: The indoor or outdoor PCB may be misinterpreting mode signals. Professional diagnosis with manufacturer service tools is recommended.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Main Control PCB
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