Fujitsu General ยท Mini-split and heat-pump systems
Fujitsu General fault codes
Fujitsu General fault displays vary between wall-mounted units, wired controllers and outdoor boards. Communication, thermistor and fan faults should be matched to the exact Airstage or mini-split model before testing or ordering parts.
How to approach a Fujitsu General fault
- Count the operation and timer light flashes and record the controller display. A flashing-light pattern may be the only code on some indoor units.
- Check the indoor-outdoor cable, terminal order and outdoor power first for communication faults, especially after installation or electrical work.
- Thermistor and fan codes can be caused by a connector or harness problem, so inspect the sensor plug and routing before replacing the sensor.
- Use the exact service manual for the indoor/outdoor pair. Fujitsu test procedures are not interchangeable with Daikin or Mitsubishi procedures.
All Fujitsu General fault codes
Every Fujitsu fault code and error message we cover, with the alarm it indicates. Select a code for symptoms, ordered diagnosis, safety guidance and repair costs.
| Code | Fault | Severity |
|---|---|---|
| 11 | Serial Communication Error | 4/10 |
Fujitsu General codes to check first
The most useful starting points for common, high-impact faults.
Need a code not listed?
Start with the exact model and controller family, then use the manufacturer's service or installation manual to confirm the code. Equipment codes are not universal: the same letters or numbers can mean different things on different brands and generations.
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