Indoor to outdoor unit communication error
What it means
On many Midea split units, E1 means 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.
Symptoms
- The indoor fan runs without cooling.
- The outdoor unit does not start.
- The code appears a few minutes after start-up.
Possible causes
- Damaged communication cable or loose terminals.
- Incorrect wiring during installation.
- No power to the outdoor unit.
- Failed indoor or outdoor board.
How to diagnose and fix
- Cut power for two minutes, then restart.
- Check the outdoor unit breaker.
- Have a technician inspect wiring, terminals and boards.
- Do not open the wiring panel while powered.
Repair cost
Wiring repair is cheap; a control 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
Does it mean the same on a window unit?
It may not; a window unit is a single box and can use the code differently, so check the manual.
Does it show up after relocating the AC?
Often, due to wires reconnected in the wrong order.
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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