How Fujitsu Split System and Ducted Error Codes Read
Fujitsu split systems and ducted units show a fault in two ways. With a wireless remote, the indoor unit’s lamps blink the code (on a ducted unit, the lamps on the IR receiver unit): the green OPERATION lamp and the orange TIMER lamp each blink a count, and the green ECONOMY lamp flashes rapidly. With a wired remote controller, the code appears on the controller’s display as two characters (41, 5U, J2).
Both point to the same code. The OPERATION lamp blinking 4 times and the TIMER lamp once is code 41, a room temperature sensor error. The error display shows only while the unit is operating.
This guide covers the error codes for Fujitsu split systems and ducted units, from Fujitsu General Australia’s installation manual for the ARTH ducted range, its ASTG wall-mounted service manual and the UTY-RNRT wired remote controller manual. Fujitsu’s manuals use one shared table, so some codes belong to other models (the multi-split and branch box codes, for example); for older models, check the unit’s own manual. Fujitsu Airstage VRF uses its own list: see the Fujitsu VRF fault code guide.
Search all 65 Fujitsu codes · Run Fujitsu splits and ducted on AirNexus
Reading the Code on Each Controller
Wireless remote: count the lamp blinks
- Watch the indoor unit’s lamps while the unit is running (on a ducted unit, the IR receiver unit).
- Count the blinks of the green OPERATION lamp and the orange TIMER lamp. Each blink is 0.5 seconds on, 0.5 seconds off. The green ECONOMY lamp flashes rapidly (0.1 seconds on, 0.1 seconds off) while a code is showing.
- Find the two counts in the list below, OPERATION first. The code column gives the matching wired controller code.
Wired remote controller
The code appears on the controller’s display. On the wired remote controller in the ASTG wall-mounted manual, “Er” appears in the set room temperature display, with the code.
Touch-panel wired controller (UTY-RNRT)
An error icon appears on the Monitor mode screen. Touch Status, then Error Information, to see the unit address and its two-digit error codes. Touch Next page to see the other connected indoor units. Fujitsu points to each unit’s installation manual for the indoor and outdoor unit codes (the list below); the controller’s own codes (CC.1, 12.1, 26.4 and others) are at the end of the table.
Know about 41 before the call comes in.
An FCU Gateway at the unit’s own control terminals connects it to a NexusLite, Zonelite-Link, ZoneNexus or Nexus. Its fault codes then show in the free AirNexus app, and the app sends a push notification when a unit reports a fault.
Fujitsu Split System and Ducted Error Code List
Search by code, lamp count or keyword. Lamp blinks are OPERATION (green) then TIMER (orange). Code 58 (intake grill error) is from the ASTG wall-mounted service manual; every other two-character code is from the ARTH ducted manual. The UTY-RNRT controller’s own codes are at the end.
| Code | Lamp blinks | Meaning |
|---|---|---|
| 11 | Operation 1, Timer 1 | Serial communication error |
| 12 | Operation 1, Timer 2 | Wired remote controller communication error |
| 15 | Operation 1, Timer 5 | Check run unfinished; automatic airflow adjustment error |
| 16 | Operation 1, Timer 6 | Peripheral unit transmission PCB connection error |
| 18 | Operation 1, Timer 8 | External communication error |
| 21 | Operation 2, Timer 1 | Unit number or refrigerant circuit address setting error (simultaneous multi-split type) |
| 22 | Operation 2, Timer 2 | Indoor unit capacity error |
| 23 | Operation 2, Timer 3 | Combination error |
| 24 | Operation 2, Timer 4 | Connection unit number error: indoor secondary unit (simultaneous multi-split type), or indoor unit or branch unit (flexible multi-split type) |
| 26 | Operation 2, Timer 6 | Indoor unit address setting error |
| 27 | Operation 2, Timer 7 | Primary unit, secondary unit setup error (simultaneous multi-split type) |
| 29 | Operation 2, Timer 9 | Connection unit number error in wired remote controller system |
| 31 | Operation 3, Timer 1 | Power supply interruption error |
| 32 | Operation 3, Timer 2 | Indoor unit PCB model information error |
| 33 | Operation 3, Timer 3 | Indoor unit motor electricity consumption detection error |
| 35 | Operation 3, Timer 5 | Manual auto switch error |
| 39 | Operation 3, Timer 9 | Indoor unit power supply error for fan motor |
| 3A | Operation 3, Timer 10 | Indoor unit communication circuit (wired remote controller) error |
| 41 | Operation 4, Timer 1 | Room temperature sensor error |
| 42 | Operation 4, Timer 2 | Indoor unit heat exchanger middle temperature sensor error |
| 44 | Operation 4, Timer 4 | Occupancy sensor error |
| 51 | Operation 5, Timer 1 | Indoor unit fan motor error |
| 53 | Operation 5, Timer 3 | Drain pump error |
| 57 | Operation 5, Timer 7 | Damper error |
| 58 | Operation 5, Timer 8 | Intake grill error |
| 59 | Operation 5, Timer 9 | Indoor unit fan motor 2 error |
| 5U | Operation 5, Timer 15 | Indoor unit error |
| 61 | Operation 6, Timer 1 | Outdoor unit reverse/missing phase and wiring error |
| 62 | Operation 6, Timer 2 | Outdoor unit main PCB model information error or communication error |
| 63 | Operation 6, Timer 3 | Inverter error |
| 64 | Operation 6, Timer 4 | Active filter error, PFC circuit error |
| 65 | Operation 6, Timer 5 | Trip terminal L error; IPM temperature error |
| 68 | Operation 6, Timer 8 | Outdoor unit rush current limiting resistor temperature rise error |
| 6A | Operation 6, Timer 10 | Display PCB microcomputers communication error |
| 71 | Operation 7, Timer 1 | Discharge temperature sensor error |
| 72 | Operation 7, Timer 2 | Compressor temperature sensor error |
| 73 | Operation 7, Timer 3 | Outdoor unit heat exchanger liquid temperature sensor error |
| 74 | Operation 7, Timer 4 | Outdoor temperature sensor error |
| 75 | Operation 7, Timer 5 | Suction gas temperature sensor error |
| 76 | Operation 7, Timer 6 | 2-way valve temperature sensor error; 3-way valve temperature sensor error |
| 77 | Operation 7, Timer 7 | Heat sink temperature sensor error |
| 82 | Operation 8, Timer 2 | Sub-cool heat exchanger gas inlet temperature sensor error; sub-cool heat exchanger gas outlet temperature sensor error |
| 83 | Operation 8, Timer 3 | Liquid pipe temperature sensor error |
| 84 | Operation 8, Timer 4 | Current sensor error |
| 86 | Operation 8, Timer 6 | Discharge pressure sensor error; suction pressure sensor error; high pressure switch error |
| 94 | Operation 9, Timer 4 | Trip detection |
| 95 | Operation 9, Timer 5 | Compressor rotor position detection error (permanent stop) |
| 97 | Operation 9, Timer 7 | Outdoor unit fan motor 1 error |
| 98 | Operation 9, Timer 8 | Outdoor unit fan motor 2 error |
| 99 | Operation 9, Timer 9 | 4-way valve error |
| 9A | Operation 9, Timer 10 | Coil (expansion valve) error |
| A1 | Operation 10, Timer 1 | Discharge temperature error |
| A3 | Operation 10, Timer 3 | Compressor temperature error |
| A4 | Operation 10, Timer 4 | High pressure error |
| A5 | Operation 10, Timer 5 | Low pressure error |
| AC | Operation 10, Timer 11 | Heat sink temperature error |
| J2 | Operation 13, Timer 2 | Branch boxes error (flexible multi-split type) |
| CC.1 | UTY-RNRT controller code | Sensor error |
| C2.1 | UTY-RNRT controller code | Transmission PCB error |
| 12.1 | UTY-RNRT controller code | Wired remote controller communication error |
| 12.3 | UTY-RNRT controller code | Too many devices in the wired remote controller system |
| 12.4 | UTY-RNRT controller code | Wired remote controller system start-up error |
| 26.4 | UTY-RNRT controller code | Address duplication in wired remote controller system |
| 26.5 | UTY-RNRT controller code | Address setting error in wired remote controller system |
| 15.4 | UTY-RNRT controller code | Data acquisition error |
Run Fujitsu Splits and Ducted on AirNexus
AirNexus supplies the controls and your HVAC contractor installs them. One app covers every connected unit on the site.
Running Fujitsu VRF on the same site? A Nexus 8, 16 or 32 runs it on the central control line: see VRF control. Not sure which fits? Use the Project Finder. AirNexus supplies Australia and New Zealand; distributors and project teams elsewhere can register as a partner.
Sources
The code meanings, lamp blink patterns and controller steps in this guide are drawn from Fujitsu General Australia’s own manuals.
- Fujitsu General Australia, Installation Manual, Duct Type ARTH24KHTA, ARTH30KHTA, ARTH36KHTA (part no. 9381386345-02), section 10 “Error codes”
- Fujitsu General Australia, Service Manual ASTG09KMCA, ASTG12KMCA / AOTG09KMCA, AOTG12KMCA, “Error detection” (source of code 58)
- Fujitsu General Australia, Installation Manual, Wired Remote Controller UTY-RNRT (part no. 9373328582-01), section 8 “Error codes”
Fujitsu fault codes: frequently asked questions
How do I read a Fujitsu error code from the indoor unit lamps?
Count the blinks of the green OPERATION lamp and the orange TIMER lamp while the unit is running; the green ECONOMY lamp flashes rapidly while a code is showing. Find the two counts in the code list, OPERATION first: OPERATION 4 and TIMER 1 is code 41, a room temperature sensor error. Search the list.
What does Fujitsu error code 5U mean?
5U is an indoor unit error. With a wireless remote it shows as the OPERATION lamp blinking 5 times and the TIMER lamp 15 times. See 5U in the list.
What does Fujitsu error code 12 mean?
12 is a wired remote controller communication error. On the indoor unit lamps it shows as the OPERATION lamp blinking once and the TIMER lamp twice. The UTY-RNRT touch-panel controller also has its own codes for its wired remote controller system: 12.1, 12.3 and 12.4. See 12 in the list.
Are Fujitsu VRF error codes the same as split system codes?
They are a different list. Fujitsu Airstage V-II VRF codes, including the outdoor unit display codes such as 86.4 and 13.1, are in the Fujitsu VRF fault code guide.
Can I see Fujitsu fault codes in an app?
Yes. An FCU Gateway wired at the unit’s own control terminals connects one Fujitsu air conditioner to a NexusLite, Zonelite-Link, ZoneNexus or Nexus. On/off, mode, fan, setpoint, room temperature and fault codes then show in the free AirNexus app, and the app sends a push notification when a unit reports a fault. Fujitsu is one of the FCU Gateway’s 15 brands, and we confirm compatibility for each unit at quote stage. See the FCU Gateway.