E7
York
Indoor Unit Address / Mode Conflict
York multi‑split system shows E7 and one or more indoor units stop cooling
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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
Duplicate indoor addresses on multi‑zone system, Incompatible operating modes between zones, Incorrect DIP switch settings on indoor PCB
How to Fix / Troubleshooting
Safety: Turn off power to the entire multi‑split system before opening any indoor unit covers.
- Check indoor unit addresses: On York multi‑zone systems, each indoor unit must have a unique address set via DIP switches or rotary selectors on the indoor PCB. Refer to the installation manual and correct any duplicates.
- Verify mode compatibility: Some outdoor units cannot run cooling and heating simultaneously on different heads. Set all zones to the same mode (all cool or all heat) and clear the error by cycling power.
- Inspect communication wiring: Ensure the daisy‑chain communication cable is correctly landed at each indoor unit and matches the York wiring diagram.
- Power cycle: After corrections, turn power off for 5 minutes, then restore and test each zone.
- If E7 persists: A control board or communication module may be faulty and should be checked by a York‑authorized technician.
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Repair Difficulty
Hard
4/5
Required Part
Indoor Unit Control Board
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