HVACopediaFujitsu · Heat pump
9U Outdoor unit error (general)
What the control is telling you
General outdoor fault - read the detailed code at the outdoor unit or service tool. Indoor lamps: OPERATION (green) flashes 9x, TIMER (orange) flashes 15x, ECONOMY (green) flashes fast nonstop; wired remote shows 9U.
Applies to: Fujitsu ductless heat pumps: Fujitsu ductless split/multi/VRF (general code list)
Likely causes
- See detailed outdoor code
Test and repair steps
- Read the outdoor detail code and follow it.
Settings for these units
- Operating range and service space · Fujitsu multi-zone outdoor 18/24 type
Other codes on the same units
- 3A Indoor communication circuit (wired remote) error
- 5U Indoor unit error (general)
- 6A Display PCB micro communication error
- 9A Expansion valve coil error
- 11 Serial communication error (indoor/outdoor)
- 12 Wired remote controller communication error
- 14 Network communication error
- 15 Check run unfinished / airflow auto-adjust error
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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.