Indoor and Outdoor Unit Communication Error

Home Appliance Error Codes TCL Split AC

Can you still use it? No, unplug it

Who can fix it? Needs a technician

Typical repair time 30 minutes – 3 hours

Typical cost SAR 100 to 2,500

What it means

This code appears on TCL split air conditioners when the signal between the indoor and outdoor units fails, so the outdoor unit does not run and there is no cooling. TCL codes are not the same across all series, so check your unit manual to confirm the meaning. The same code can mean something else on other brands.

Models covered: TCL split air conditioners; codes differ between TCL series, so confirm with the unit manual.

Symptoms3

The outdoor unit does not run at all.
Air from the indoor unit is at room temperature.
The code shows at once or after a few minutes, sometimes after a power cut.

Possible causes5

Loose or corroded terminals, especially in the outdoor unit exposed to dust and moisture.
Wires in the wrong order after installation or relocation.
Damaged cable or an unprotected joint along it.
No power at the outdoor unit or a blown fuse on its board.
Faulty outdoor or indoor board.

How to diagnose5

Confirm the code meaning in your unit manual.
Switch off at the breaker for a few minutes, then restart.
The technician tightens terminals and matches the wire order to the diagram.
The technician measures voltage at the outdoor unit and checks its board fuse.
The technician tests the cable and identifies the faulty board.

How to fix5

Tighten and clean terminals and correct the wire order.
Replace the damaged cable or repair the joint.
Replace the fuse after finding why it blew.
Replace the faulty board.
Run the unit and confirm the outdoor unit works without the code returning.

Repair cost

0–200

200–600

600–1,500

1,500+

In Saudi riyals; the highlighted part is the expected range for this fault.

Tightening terminals or a new cable is the usual low-cost fix; an outdoor board pushes the cost to the top of the range.

Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026

Frequently asked questions

Can a power cut cause E0?

It can if power returns to one unit before the other, and it usually clears after a few minutes off at the breaker. If it stays, the cable or a board is at fault.

Is E0 on TCL the same as on Midea?

No. On Midea E0 is a memory error, while on TCL it usually means communication, so do not carry code meanings between brands.

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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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