HVACopediaFujitsu · Heat pump
Custom code A/B/C/D Wireless remote custom code display
What the display is showing
The wireless remote can be set to one of four custom codes, A to D, and the indoor unit only answers to the same code. The remote shows the current code when you hold MODE for 5 seconds or more. Shipping default is A, and the remote returns to A when its batteries are replaced.
Applies to: Fujitsu ductless heat pumps: Fujitsu wall-mounted 7-15 (NA ASU/AOU type); Fujitsu ductless heat pumps: Fujitsu slim duct ARU 7-18 (LL type)
What to do
- Press START/STOP until only the clock shows on the remote.
- Hold MODE for 5 seconds or more to show the current code.
- Press SET TEMP up or down to cycle A, B, C, D.
- Press MODE again to return to the clock and store it.
- If no key is pressed within 30 seconds the remote goes back to the clock without a change.
Settings for these units
- Operating range and service space · Fujitsu multi-zone outdoor 18/24 type
Other codes on the same units
- 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)
- MANUAL AUTO 10 s Start test run / forced cooling from the indoor unit
- OPERATION + TIMER lamps flash together Test run / forced cooling running
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Source: Fujitsu Wall-mounted 7-9-12-15 (North American trilingual, UTY-RNNUM remotes; e.g. ASU9-12-15 RLF1-RLS familie.pdf - section 11 Function setting, step 1 and remote controller custom code setting; Fujitsu Slim duct AR07-09-12-14-18 (ARU-ARYG LL-type equivalent) installation P-N 9381858064.pdf - section 13 Customer guidance. Summarized in our own words; check the original manual for your model.
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.