HVACopediaFujitsu · Heat pump
84 Current sensor error
What the control is telling you
Outdoor current sensor fault (permanent stop). Indoor lamps: OPERATION (green) flashes 8x, TIMER (orange) flashes 4x, ECONOMY (green) flashes fast nonstop; wired remote shows 84.
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
- Current sensor / outdoor PCB fault
Test and repair steps
- Check outdoor PCB connections.
- Replace the outdoor main PCB (current sensor is on the board on most splits).
Settings for these units
- Operating range and service space · Fujitsu multi-zone outdoor 18/24 type
Other codes on the same units
- 76 2-way / 3-way valve temperature sensor error
- 77 Heat sink temperature sensor error
- 82 Sub-cool heat exchanger sensor error
- 83 Liquid pipe temperature sensor error
- 86 Pressure sensor / high pressure switch error
- 94 Overcurrent trip detection
- 95 Compressor motor control / rotor position error
- 97 Outdoor fan motor 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 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.