Daikin VRV Error Code PA

Full Diagnosis

PA displays during the automatic refrigerant charging procedure when the refrigerant cylinder connected to the master (lead) outdoor module runs empty before the calculated charge amount has been delivered — on a multi-module VRV system, the master unit coordinates the charge sequence across all modules, so an empty cylinder here pauses that portion of the process specifically. This is a commissioning-stage prompt requiring the technician to swap in a full cylinder and resume, not a hardware failure. Distinguish from PC (the equivalent empty-cylinder condition on a slave/subordinate outdoor module rather than the master) and from U0 (a refrigerant shortage fault detected during normal running operation rather than during the charge procedure itself).

All Recorded Causes

Refrigerant cylinder connected to the master unit depleted before the target charge weight was reached, undersized cylinder for the calculated system charge, charging process paused or interrupted requiring cylinder replacement.

Verify Before Replacing Parts

1. Confirm the exact Daikin model family and vrv context before acting on a generic code description.
2. Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since refrigerant cylinder connected to the master unit depleted before the target charge weight….
3. Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm the next candidate on the list.
4. After the correction, run the system long enough to confirm the vrv fault does not return under normal load.