Fujitsu · Heat pump

J1 VRF branch box error

Medium severity Fujitsu ductless split/multi/VRF (general code list)

What the control is telling you

Fault reported by a VRF branch (RB) box. Indoor lamps: OPERATION (green) flashes 13x, TIMER (orange) flashes 1x, ECONOMY (green) flashes fast nonstop; wired remote shows J1.

Applies to: Fujitsu ductless heat pumps: Fujitsu ductless split/multi/VRF (general code list)

Likely causes

Branch box fault/wiring

Test and repair steps

Check the branch box and its LEDs/wiring.

Settings for these units

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

Other codes on the same units

97 Outdoor fan motor error
98 Outdoor fan motor 2 error
99 4-way valve error
A1 High discharge temperature
A3 High compressor temperature
A4 High pressure error
A5 Low pressure error
J2 Branch box error (flexible multi)

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Source: Fujitsu All Fujitsu split - multi - VRF (generic code list) codes.pdf - section error code table (indoor LED flashes). 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.