Indoor unit shows E6; unit may not respond to remote or may not start cooling/heating.

Danger: Communication wiring carries mains-adjacent voltages in many split systems. Turn off the main breaker and verify power is off before touching terminals.

• 1. Power cycle: Turn off power to both indoor and outdoor units for 5–10 minutes, then restore power. If E6 returns, continue.
• 2. Check interconnecting cable: Remove the indoor and outdoor terminal covers. Verify that the numbered terminals (e.g., 1–2–3 or L–N–S) match exactly between indoor and outdoor units.
• 3. Tighten terminals: Gently tug each wire; if any move, loosen and re-tighten the screw clamps. Ensure no copper strands are exposed or touching adjacent terminals.
• 4. Inspect cable: Look along the cable route for damage from nails, rodents, or UV exposure. Replace the cable if insulation is cracked or if conductors are damaged.
• 5. Check polarity (if applicable): Some Beko models require correct polarity on communication terminals. Ensure wires are not swapped.
• 6. If wiring is correct and intact: The fault may be on the indoor or outdoor PCB. At this stage, professional diagnosis with live voltage measurements is recommended.