Error Code: PC 49 – Compressor Overcurrent Failure

Error Code: PC 49 – Compressor Overcurrent Failure

What this means:
The compressor is drawing too much current during operation, which may indicate electrical issues, high refrigerant pressure, or mechanical problems. The system enters protection mode to prevent damage to the outdoor PCB and compressor.

Try this first (quick reset):

1. Turn off the unit completely.

2. Wait 2 full minutes.

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

• If the error clears — the system may have just experienced a brief surge.

• If the error returns — continue with the steps below.

Next steps (for technicians):

1. Check input power supply and voltage:

   • Confirm proper voltage (220V–400V AC) between L and N.

   • Measure DC voltage between P and N in standby (~310V, 340V, or 380V).

   • If voltage is unstable or low → correct power wiring or supply.

2. Inspect reactor and inductance:

   • Make sure the reactor is wired correctly.

   • If damaged or faulty → replace the reactor.

3. Evaluate system conditions:

   • Is ambient temperature above 50°C? Allow unit to cool.

   • Ensure the outdoor fan is running and heat exchanger is clean.

   • If system pressure is too high, reduce overcharged refrigerant.

4. Check for airflow and mechanical resistance:

   • Obstructed ventilation can lead to compressor strain.

   • If airflow is normal and power is correct → replace the outdoor PCB.

What you might need:

• Outdoor PCB

• Reactor

• Compressor (if internally shorted)

• Fan assembly

• Refrigerant recovery tools

• Connection wires

Helpful tip:
Compressor overcurrent is often triggered by overheating, incorrect refrigerant charge, or faulty startup. Always check system pressure and voltage before replacing major components.

Click here to view the detailed guide.TS08-S