TCL Air Conditioner Error Codes

Below is a detailed guide to understanding and troubleshooting the error codes displayed by TCL air conditioners.

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Error Codes and Their Solutions

Error E0 – Communication Error Between Indoor and Outdoor Units

When the indoor unit displays error E0, it indicates a communication failure between the indoor and outdoor units.

1. Verify the cable and connection between the indoor and outdoor units.
2. If the connection is correct, inspect the communication terminal on both units.
3. Measure the DC voltage:
   • If the voltage is between 13V and 24V, the indoor PCB is functioning correctly.
   • If not, replace the outdoor PCB.

Error E1/E2 – Indoor Temperature/Coil Sensor Failure

• E1 indicates a failure in the indoor temperature sensor.
• E2 indicates a failure in the indoor coil sensor.

1. Check the placement of both sensors.
2. Measure the sensor resistance. If it is not 5 kΩ, replace the faulty sensors.

Error E3/E7/E8 – Outdoor Sensor Failure

• E3, E7, and E8 signify outdoor sensor malfunctions.

1. Ensure the temperature sensors are properly connected to slots CN1 and CN2.
2. Measure the sensor resistance. Replace sensors that are out of range.

Error E4 – Abnormal System Cycle

Error E4 indicates an issue in the refrigerant cycle.

1. Check the high and low-pressure valves for proper operation.
2. Inspect the refrigerant system for blockages and ensure smooth circulation.
3. Examine the evaporator coil temperature sensor and refrigerant levels. Clean blocked pipes and recharge refrigerant if needed.

Error E5/E6 – Indoor Fan Motor Failure

• E5 indicates an issue with the indoor fan motor.

1. Check the fan blade positioning and adjust if necessary.
2. Inspect the motor’s connection to the indoor PCB. Replace the capacitor or motor if faulty.

Error EF – Outdoor Fan Motor Failure

Error EF points to a malfunction in the outdoor fan motor.

1. Verify the motor’s connection to the PCB.
2. Measure motor resistance and replace if necessary.
3. Check the power supply from the PCB and replace the PCB if required.

Error EE – Outdoor PCB Kit or EEPROM Error

• EE indicates a fault in the outdoor PCB kit or an EEPROM error.

1. Power off the unit and inspect the EEPROM installation.
2. Adjust or reinstall the EEPROM if loose.
3. Replace the indoor PCB first and the outdoor PCB if the issue persists.

Error EU – External Voltage Problem

• EU signifies an external voltage issue.

1. Verify the power supply.
2. Inspect the communication cable between the power board and the intelligent power module.
3. Replace the power board or intelligent power module if necessary.

Error E9 – Intelligent Power Module Failure

Replace the intelligent power module to resolve the error.

Error EA – Refrigerant Issue

• EA indicates low refrigerant levels.

1. Verify and recharge the refrigerant.
2. Check the inverter PCB voltage between pin 5 and pin 2 on the power factor correction circuit.
   • If less than 0.4V, replace the power factor correction unit.
   • If more than 0.4V, replace the intelligent power module.

Error EP – Temperature Switch Failure

• EP relates to a failure in the temperature switch on top of the compressor.

1. Inspect the temperature switch cable on the external power board.
2. Check compressor wiring and ensure proper ventilation.
3. Replace the temperature switch if faulty.

Error EC:

EC Error Code in TCL Air Conditioners: Diagnosis and Solution
The EC error code in TCL air conditioners is typically associated with voltage supply issues or communication failures between the power supply board and the intelligent power module (IPM).

Error P0

The P0 code is related to potential issues with a frequency inverter that controls the compressor.

Error P1 – Overvoltage/Undervoltage Protection

• P1 indicates voltage protection.

1. Check the main power supply (160V–260V range).
2. Verify voltage between the neutral and medium line on the outdoor unit. Replace the PCB if abnormal.

Error P2 – Overcurrent Protection

1. Inspect the outdoor fan motor.
2. Check and replace the capacitor if damaged.
3. Replace the intelligent power module if necessary.

Error P4 – Exhaust Overtemperature Protection

• P4 indicates excessive exhaust temperature.

1. Ensure the outdoor unit’s airflow is unobstructed.
2. Check refrigerant levels and the exhaust temperature sensor. Replace the sensor if faulty.

Error P5 – Subcooling/Superheating Protection

1. Clean the indoor unit’s filter and fan.
2. Inspect the room temperature sensor and coil sensor. Replace defective components.

Error P6 – Overheating Protection

Follow the same troubleshooting steps as for P4.

Error P7 – Overheating Protection in Heating Mode

Follow the steps for P4 and P6.

Error P8 – Outdoor Temperature Protection

• P8 occurs when ambient temperatures are below -1°C or above 33°C.

1. Wait for temperature changes.
2. Inspect the temperature sensor if the error persists.

Error P9 – Drive or Software Control Protection

• P9 involves software issues or drive protection.

1. Contact the manufacturer for a software update.
2. Replace the PCB if the problem continues.