TCL Split AC Error Code E8 — What It Means & How to Fix It

What Does This Error Mean?

E8 means the discharge temperature sensor on the compressor has failed. This sensor monitors how hot the refrigerant gas is leaving the compressor. Without it the AC cannot protect the compressor from overheating.

Affected Models

TCL TAC-09CHSD/XA21
TCL TAC-12CHSD/XA21
TCL TAC-18CHSD/XA21
TCL TAC-24CHSD/XA21
TCL Inverter Split System

Common Causes

Discharge temperature sensor wire corroded or broken
Sensor probe dislodged from its mounting position on the compressor
Outdoor PCB connector loose or oxidised
Sensor resistance drifted out of range due to heat exposure over time
Outdoor PCB fault generating a false sensor error

How to Fix It

Switch off the AC at the wall and wait 5–10 minutes before restarting.

A power reset clears temporary faults. If E8 does not return, it was a one-off glitch.
Check whether the outdoor unit is exposed to direct sun or poor ventilation.

Extreme heat near the outdoor unit can cause the sensor to read falsely high and trigger E8.
Turn off the power and inspect the outdoor unit for debris blocking the airflow.

Leaves, dirt, or objects around the outdoor coil trap heat and stress the discharge sensor.
Have a technician open the outdoor unit and check the discharge sensor connector.

A loose connector on the outdoor PCB is a common cause of E8 that is easy and cheap to fix.
If the connector is secure, test the sensor resistance with a multimeter.

Compare the reading against the TCL service manual spec. A faulty sensor will read open or shorted.
Replace the discharge temperature sensor if it is out of specification.

This is a low-cost part. Replacing it early prevents compressor damage from unmonitored overheating.

When to Call a Professional

Call a technician to inspect and replace the discharge temperature sensor. This sensor is located in the outdoor unit near the compressor — a trained technician should handle this. Ignoring E8 risks compressor damage, which is one of the most expensive AC repairs.

Frequently Asked Questions

Is E8 dangerous to ignore on a TCL AC?

Yes — the discharge temperature sensor is a key compressor protection device. If it fails permanently and the compressor overheats, you risk a complete compressor failure. Compressor replacement can cost more than the unit is worth, so address E8 promptly.

Where is the discharge temperature sensor located on a TCL split AC?

It is mounted in the outdoor unit, clipped directly onto the discharge pipe near the compressor. The pipe carries hot refrigerant gas from the compressor to the condenser coil. You will need to open the outdoor unit panel to access it.

Can low refrigerant cause an E8 error on TCL AC?

Low refrigerant causes the compressor to run hotter than normal. This can trigger the discharge sensor to detect high temperatures and generate E8. If E8 occurs along with poor cooling, suspect a refrigerant leak and call a technician.