Indoor unit displays E6; system does not start or stops; sometimes indoor fan runs but no cooling or heating.

Safety: Turn off power to both indoor and outdoor units at the breaker. Communication lines may carry low voltage but are connected to high-voltage equipment.

Steps:

• Check wiring diagram: Refer to the Gorenje wiring label on the indoor unit cover. Confirm that terminals (e.g., 1-2-3 or L-N-S) are wired identically at indoor and outdoor units.
• Tighten terminals: Remove the indoor and outdoor covers over the terminal blocks. Tighten all screws on the communication and power terminals. Loose screws can cause intermittent E6.
• Inspect cable: Follow the interconnecting cable along its route. Look for crushed, cut, or water-damaged sections. Replace the cable if insulation is compromised.
• Polarity check: Ensure that each numbered or labeled terminal on the indoor unit goes to the same terminal on the outdoor unit. Correct any cross-wiring.
• Power cycle: After corrections, turn power back on and wait several minutes for communication to re-establish.
• If E6 persists: One of the PCBs may be defective. A technician can test signal voltages and replace the indoor or outdoor PCB as needed.