Indoor to outdoor unit communication error
What it means
On Gree units, E6 commonly means the indoor and outdoor units have lost communication, so the outdoor unit will not run and there is no cooling. The meaning can vary by model, so check the manual for your unit.
Symptoms3
- The indoor fan runs but the air is not cold.
- The outdoor unit does not start at all.
- The code appears a few minutes after switching on.
Possible causes4
- Loose, corroded or miswired interconnecting cable.
- No power reaching the outdoor unit.
- Faulty indoor or outdoor control board.
- Heat- or sun-damaged wiring or electrical interference.
How to diagnose and fix4
- Cut power to the unit for two minutes, then restart.
- Check that the outdoor unit breaker, if separate, has not tripped.
- Have a technician inspect the communication cable and terminals on both units.
- Never remove wiring covers while the unit is powered.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
Tightening terminals or replacing the cable is cheap; a control board costs considerably more.
Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Frequently asked questions
Can this happen right after a new installation?
Yes, often, and incorrect wiring order during installation is a frequent cause.
Can I still use fan mode?
Usually yes, but there will be no cooling until communication is restored.
This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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