Indoor to outdoor unit communication error
What it means
On many Haier split units, E7 indicates a communication error between the indoor and outdoor units. This is the common meaning and it can vary by model, so check the manual for your unit.
Symptoms3
- No cooling.
- The outdoor unit is idle.
- The code shows shortly after start-up.
Possible causes4
- Damaged communication cable or loose terminals.
- Wires connected in the wrong order at installation.
- No power to the outdoor unit.
- Failed indoor or outdoor board.
How to diagnose and fix4
- Cut power for two minutes, then restart.
- Check the outdoor unit breaker is on.
- Have a technician check the wiring, then the boards.
- Do not open wiring covers while the unit is powered.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
Wiring is cheap to fix; a board raises the cost.
Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Frequently asked questions
Can poor power supply cause it?
Severe voltage fluctuation can sometimes contribute.
Is the repair quick?
If it is a loose terminal, the fix takes minutes.
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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