Error Code: PC 44 – Outdoor Unit Zero Speed Protection

Error Code: PC 44 – Outdoor Unit Zero Speed Protection

What this means:
This error is triggered when the system detects that the compressor is not accelerating from zero speed as expected. It's part of the inverter protection logic and often linked to abnormal current or voltage issues, power component faults, or blocked compressor rotationTS19.

Try this first (quick reset):

1. Power off the unit.

2. Wait 2 minutes.

3. Turn the unit back on and observe the display.

• If the error clears — system resumes operation.

• If the error returns — continue with diagnostic steps.

Next steps (for technicians):

1. Check power wiring:

   • Ensure L and N terminals are correctly wired.

   • If not → reconnect power wiring.

2. Measure AC and DC voltage levels:

   • AC input (L–N), bridge rectifier input, and DC bus (P–N).

   • If any values are abnormal → replace bridge rectifier or PFC module.

3. Check reactor and inductance coil wiring:

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

4. Evaluate system ventilation and ambient temperature:

   • If outdoor temperature > 50°C → stop unit and allow to cool.

   • If airflow is poor → clean heat exchanger and ensure fan operates correctly.

5. Check for refrigerant overcharge:

   • If system pressure is too high → recycle excess refrigerant.

6. If all checks pass but issue persists:

   • Replace the outdoor main PCB.

What you might need:

• Outdoor PCB

• Bridge rectifier

• PFC module or reactor

• Outdoor fan

• Refrigerant tools

• Connection wires

Helpful tip:
PC 44 is often seen alongside current-related errors like PC 08 or PC 46. Begin with simple voltage checks and ventilation inspection before replacing the PCB.

Click here to view the detailed guide. TS19