Indoor Unit AC Error Codes
| Code | Possible Cause |
|---|---|
| OO | ID to RC Comms Fail |
| O1 | ID to OD Comms Fail |
| O2 | ID Air Sensor Open |
| O3 | ID Air Sensor Close |
| O4 | ID Pipe Sensor Open |
| O5 | ID Pipe Sensor Close |
| O6 | OD Pipe Sensor Fail |
| O8 | Power Source Connection Failure |
| O9 | Drain Problem Float switch operated |
| OA | OD Air Sensor Fail |
| OC | Discharge sensor Fail |
| OE | Outdoor High Pressure Heatsink error |
| 11 | OD PCB Fail |
| 12 | ID Fan Fail |
| 13 | OD Signal Abnormal ID signal error |
| 14 | OD EEPROM Fail |
| 15 | Compressor Temp Failure |
| 16 | Pressure Switch Error |
| 17 | IPM Error |
| 18 | CT Error |
| 19 | Active Filter Module Error |
| 1A | Compressor Failure |
| 1B | OD Fan Failure |
| 1C | Inverter to PCB Comms Fail |
| 1D | 2 Way Valve sensor Fail |
| 1E | Expansion Valve Error |
| 1F | Connection ID Unit Error |
| 20 | Indoor manual switch abnormal |
| 24 | Excessive high pressure protection on cooling |
| 25 | PFC circuit error |
| 26 | Indoor signal error |
| 27 | Indoor signal error |
| 28 | Indoor heat exchanger temperature error |
| 29 | Outdoor heat exchanger temperature (middle) error |
| 2A | Power supply frequency detection error |
| 2B | Compressor temperature error |
| 2C | Four-way valve abnormal |
This table covers the current Fujitsu aircon inverter product range. Included are the ARY60U, ARY54U Single and AOY19/24F/U Multi System models.
Troubleshooting Fujitsu Indoor Units
Here are a couple of troubleshooting tips to diagnose and repair issues affecting Fujitsu wired remote control AC models:
- When the E:EE Is Displayed - If you see the E:EE displayed, simply switch the unit off and press the temperature up and temperature down buttons simultaneously for 3 seconds.
- Return to Normal Operation - If you want to return to normal operations, simply press the temperature up and temperature down buttons together for 3 seconds.
- Initiate Test Operation - To initiate test operation, simply switch the unit off and press and hold the master and fan buttons simultaneously for 3 seconds. Afterwards, press the start/stop button to initiate.
- Change the Sensor Position - Turn the unit off and change the position by pressing the THERMOSENSOR button for 5 seconds. Once unlocked, toggle the button further until the controller panel is displayed. Then set it to your desired setting and press the button again for 5 seconds to lock it again.
- Set on RC DIP SWs - For single handset units, turn DIP SW1 on and turn 2 off. For dual handset master units, turn both on while turning both slaves off.
- Turn Group Control Up to 16 Unit from 1 RC Handset - Set the DIP SW3 switch on and RC on. Set each ID unit rotary SW to Unit Address (0-15) in series
- Enable Auto Restart on Power Failure - To enable auto restart on power failure, turn DIP SW2-3 on ID unit. Off is auto restart and on is manual restart
- Auto Changeover - Turn DIP SW5 on RC. Set on on auto changeover while off is manual
- Memory Retention on Power Failure - Dip SW6 on RC. On is memory/off is no memory

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