Error Code: PC 44 – Outdoor Zero Speed Protection

Error Code: PC 44 – Outdoor Zero Speed Protection

What this means:
The outdoor unit has detected that the compressor or fan is not rotating when it should be. This could be caused by a power supply issue, wiring fault, blocked rotor, or internal board failure.

Try this first (quick reset):

1. Turn off the unit completely.

2. Wait 2 full minutes.

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

• If the error clears — the issue may have been a temporary stall or detection glitch.

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

Next steps (for technicians):

1. Check for standby status activation:

   • If protection occurs during standby, check for a faulty sensor or control signal.

2. Check voltage and power supply:

   • Ensure voltage between L and N and P and N is within spec (e.g., 220–400V AC, or DC 310–380V in standby).

   • If voltage is low or unstable, correct the supply.

3. Inspect the wiring and reactor:

   • Ensure all power wires and reactor connections are securely wired.

   • If wiring is bad → correct or replace.

4. Check for blocked or failed rotation:

   • Ensure the compressor or fan motor isn't physically stuck or jammed.

   • Rotate manually if safe. If blocked or seized → replace the part.

5. Evaluate system ventilation and temperature:

   • Poor ventilation or excessive ambient heat (>50°C) may trigger this error.

   • Clean heat exchanger, ensure fan is operating, and check system airflow.

6. If all tests pass but error remains:

   • Replace the outdoor main PCB.

What you might need:

• Outdoor PCB

• Fan motor or compressor (if seized)

• Reactor

• Connection wires

Helpful tip:
This protection is triggered when the system expects motion but detects zero speed in critical components. Always verify actual physical rotation and electrical signal integrity before replacing components.

Click here to view the detailed guide.TS08-S