Error Code: PC 0A – High Temperature Protection of Condenser

Error Code: PC 0A – High Temperature Protection of Condenser

What this means:
The outdoor unit has detected that the condenser (outdoor coil) temperature has exceeded 65°C, which is above the safe limit. The system shuts down to protect internal components and will only restart once the temperature drops below 52°C.

Try this first (quick reset):

1. Turn off power to the unit completely.

2. Wait 2 full minutes.

3. Turn it back on and check if the error clears.

• If the error clears — it may have been triggered by temporary heat buildup.

• If the error remains — continue with the checks below.

Next steps (for technicians):

1. Measure condenser temperature:

   • If above 65°C → proceed with diagnosis.

   • If not, check sensor or control signal.

2. Test the condenser temperature sensor:

   • Measure resistance.

   • If abnormal → replace the temperature sensor.

3. Check sensor wiring to PCB:

   • Ensure connection is clean, secure, and not damaged.

   • If loose or faulty → correct the connection.

4. Verify ambient conditions and ventilation:

   • If ambient temperature is over 50°C (or 54°C in tropical models), wait or improve ventilation.

   • Ensure outdoor fan is running and airflow is unobstructed.

   • Clean the heat exchanger if dirty.

5. Check refrigerant system:

   • If refrigerant is low → recharge to correct level.

   • If pressure is normal and all other steps pass → replace the outdoor PCB.

What you might need:

• Condenser temperature sensor

• Outdoor fan

• Outdoor PCB

• Refrigerant

• Connection wires

Helpful tip:
This error is often triggered by poor airflow, high ambient temperature, or a failing sensor. Always inspect fan operation and heat exchanger cleanliness before replacing components.

Click here to view the detailed guide.TS27-INV