E201
Samsung
Indoor-Outdoor Communication Error (Addressing / Protocol)
Indoor unit shows E201; unit may not respond to remote commands.
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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 address setting on multi-split system, Faulty communication cable, Noise interference on signal line, Defective indoor or outdoor PCB communication circuit
How to Fix / Troubleshooting
Safety first: Turn off power to the entire system before adjusting any wiring or DIP switches.
- Step 1 – For single-split systems: Treat as a communication wiring issue. Verify that the communication terminals are wired identically between indoor and outdoor units and that cable shielding (if present) is properly grounded.
- Step 2 – For multi-split systems: Check indoor unit address settings (DIP switches or software settings) against the installation manual. Each indoor must have a unique address.
- Step 3 – Inspect cable routing: Avoid running the communication cable parallel to high-voltage power cables over long distances, as this can induce noise.
- Step 4 – Power reset: After corrections, power down all units for 5–10 minutes, then power up the outdoor unit first, followed by indoor units.
- Technician required: If E201 persists, a technician should test the communication signal with appropriate tools and may need to replace the indoor or outdoor PCB.
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Repair Difficulty
Hard
4/5
Required Part
Communication Cable
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