Fujitsu · Heat pump

15 Check run unfinished / airflow auto-adjust error

Low 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

The commissioning check run has not been completed (on ducted units this also covers a failed automatic airflow adjustment). Indoor lamps: OPERATION (green) flashes 1x, TIMER (orange) flashes 5x, ECONOMY (green) flashes fast nonstop; wired remote shows 15.

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

Test run / check run not finished after install
Duct static outside the unit range during auto adjust

Test and repair steps

Complete the check run / test run per the install manual.
On ducted units check duct static and filters, then repeat the airflow auto-adjust or set static pressure manually (function 26).

Settings for these units

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

Other codes on the same units

9U Outdoor unit error (general)
11 Serial communication error (indoor/outdoor)
12 Wired remote controller communication error
14 Network communication error
16 Peripheral unit / transmission PCB connection error
18 External communication error (WLAN / option adapter)
21 Address / refrigerant circuit setting error
22 Indoor unit capacity 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.