Fujitsu · Heat pump

64 PFC / active filter circuit error

High severity Fujitsu ductless split/multi/VRF (general code list)Fujitsu wall-mounted 7-15 (NA ASU/AOU type)Fujitsu slim duct ARU 7-18 (LL type)

What the control is telling you

Inverter DC bus voltage abnormal (UK data: over 415 V DC for 3 s stops the compressor; 5 repeats = permanent stop). Indoor lamps: OPERATION (green) flashes 6x, TIMER (orange) flashes 4x, ECONOMY (green) flashes fast nonstop; wired remote shows 64.

Applies to: Fujitsu ductless heat pumps: Fujitsu ductless split/multi/VRF (general code list), Fujitsu wall-mounted 7-15 (NA ASU/AOU type), Fujitsu slim duct ARU 7-18 (LL type)

Likely causes

Supply dips, outages or noise
Loose outdoor connector
Outdoor main PCB failure

Test and repair steps

Check for heavy loads on the same circuit, poor contacts or leakage in the supply, and noise sources; confirm good ground.
Check outdoor board connectors and cables.
Reset power after repairs; replace the outdoor main PCB if it persists.

Settings for these units

Operating range and service space · Fujitsu multi-zone outdoor 18/24 type

Other codes on the same units

58 Intake grille error
61 Outdoor reverse / missing phase or wiring error
62 Outdoor main PCB error (EEPROM / model / micro comms)
63 Inverter error
65 IPM / trip terminal L error
68 Rush current limiting resistor temp rise error
71 Discharge temperature sensor error
72 Compressor temperature sensor error

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Source: Fujitsu All Fujitsu split - multi - VRF (generic code list) codes.pdf - section error code table (indoor LED flashes); Fujitsu Wall-mounted 7-9-12-15 (North American trilingual, UTY-RNNUM remotes; e.g. ASU9-12-15 RLF1-RLS familie.pdf - section 14 Error codes; Fujitsu Wall-mounted KMCG (ASEH-AOEH 07-14) - Fujitsu UK; same error-code scheme as NA ASU-AOU units service S.pdf - section 3 Troubleshooting, 2 Troubleshooting with error code; Fujitsu Slim duct AR07-09-12-14-18 (ARU-ARYG LL-type equivalent) installation P-N 9381858064.pdf - section 14 Error codes. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.