Error Code: PC A1 – Condensation Protection of Refrigerant Pipe

Error Code: PC A1 – Condensation Protection of Refrigerant Pipe

What this means:
This error is triggered when the temperature detected by the T4 or T5 sensor stays above a critical value for a certain period, indicating a potential risk of condensation or overheating around the refrigerant pipe.

Try this first (quick reset):

1. Turn off the unit and allow it to cool for several minutes.

2. Restart the system and observe if the error returns.

• If it clears — monitor the system.

• If it returns — begin sensor and component checks.

Next steps (for technicians):

1. Compare actual sensor temperature readings to real values:

   • Use a thermometer to measure at the T4 (ambient) and T5 (discharge) sensor positions.

   • Use the “point check” function on the indoor unit to compare values.

2. If there is a large deviation between sensor and actual reading:

   • Check the wiring between sensor and PCB.

   • Measure resistance of the sensor.

   • If out of spec → replace the T4 or T5 sensor.

3. If the sensors are accurate:

   • Check for abnormal temperature difference at the inlet and outlet of the main electronic expansion valve (EXV).

   • If so → replace the main EXV.

4. If problem persists after replacing sensors and EXV:

   • Replace the outdoor PCB.

5. Environmental check:

   • Is the T4 sensor exposed to direct sunlight? Shield it if necessary.

What you might need:

• T4 sensor (ambient)

• T5 sensor (discharge)

• Main electronic expansion valve (EXV)

• Outdoor PCB

• Thermometer

• Multimeter

Helpful tip:
Sensor misalignment or exposure to heat sources (like direct sun) can trigger this error falsely. Always validate sensor readings against real-world measurements before replacing hardware.

Click here to view the detailed guide. TS45