Error Code: PC 49 – Compressor Overcurrent Failure

Error Code: PC 49 – Compressor Overcurrent Failure

What this means:
The system has detected a sudden, abnormal rise in compressor current, likely due to overload, component failure, or wiring fault. This protection prevents damage to the inverter drive and compressor circuit.

Try this first (quick reset):

1. Turn off power to the system.

2. Wait 2 full minutes.

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

• If it clears — monitor for recurring faults.

• If it returns — follow the detailed diagnostics below.

Next steps (for technicians):

1. Was protection triggered in standby mode?

   • If yes → replace the outdoor main PCB.

2. Check compressor current:

   • If abnormal → investigate cause.

   • If normal → proceed to voltage checks.

3. Verify outdoor power voltage (L–N terminals):

   • If voltage is unstable or too low → wait for power to stabilize or reconnect wiring.

4. Check bridge rectifier input/output voltage:

   • If wiring is loose or incorrect → reconnect or replace.

   • If bridge rectifier is faulty → replace it.

5. Inspect PFC module and reactor wiring:

   • Reconnect any loose terminals.

   • If the reactor/inductance is damaged → replace.

6. Check system pressure and ambient temperature:

   • If overcharged or ambient temp is > 50°C → stop operation and cool down.

   • If heat exchanger is dirty → clean it.

7. Ensure outdoor fan is running properly:

   • If not → refer to EC 07 diagnostic for fan speed faults.

8. If all components are normal but issue persists:

   • Replace the outdoor main PCB.

What you might need:

• Outdoor main PCB

• Bridge rectifier

• PFC module or reactor

• Outdoor fan

• IPM module board

• Pressure switch

• Connection wires

• Refrigerant servicing tools

Helpful tip:
PC 49 shares many root causes with PC 08, PC 44, and PC 46. Always verify electrical wiring, refrigerant charge, and fan operation before swapping hardware.

Click here to view the detailed guide. TS19