Fujitsu · Heat pump

86 Pressure sensor / high pressure switch 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

Discharge or suction pressure sensor, or the high pressure switch, reads abnormal. Indoor lamps: OPERATION (green) flashes 8x, TIMER (orange) flashes 6x, ECONOMY (green) flashes fast nonstop; wired remote shows 86.

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

Sensor/switch plug
Sensor or switch failure
PCB

Test and repair steps

Check sensor and switch plugs.
Check switch continuity and sensor output.
Replace faulty part.

Settings for these units

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

Other codes on the same units

77 Heat sink temperature sensor error
82 Sub-cool heat exchanger sensor error
83 Liquid pipe temperature sensor error
84 Current sensor error
94 Overcurrent trip detection
95 Compressor motor control / rotor position error
97 Outdoor fan motor error
98 Outdoor fan motor 2 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.