Error code
E: 64 PFC circuit error
Applies to 6 models
ASUG09LZAS, ASUG12LZAS, ASUG15LZAS, AOUG09LZAH1, AOUG12LZAH1, AOUG15LZAH1
What this means
The Power Factor Correction (PFC) circuit detected inverter DC voltage above 415 V for more than 3 seconds; repeated events can permanently stop the compressor. Connection, electrical-noise, or main-PCB faults may be involved.
When to call a technician
This fault involves refrigerant, pressure, or electrical work that must be handled by a certified technician under EU F-gas rules. Do not attempt to open the refrigerant circuit, access mains wiring, or adjust pressure components yourself. Contact a qualified installer or servicer for this one.