Overview
The Fujitsu Airstage AOTA72LALT and AOTA90LALT outdoor units feature a built-in diagnostic and configuration interface, allowing field technicians to monitor operating parameters, adjust function settings, and review system error history without the need for additional tools.
These settings are accessed via the control PCB interface using the Mode, Select, and Enter buttons and the 7-segment LED display.
1. Control Interface Layout
Panel Components
| Component | Label | Function |
|---|---|---|
| POWER/MODE LED | LED101 (Green) | Illuminates when powered on |
| ERROR LED | LED102 (Red) | Flashes rapidly to indicate an active fault |
| 7-Segment Display | LED104 / LED105 | Displays codes, settings, and modes |
| MODE / EXIT Button | SW107 | Switches between operating and setup modes |
| SELECT Button | SW108 | Scrolls through mode or item numbers |
| ENTER Button | SW109 | Confirms and stores settings |
| PUMP DOWN / DIP Switches | SW102 / DIP | Not used for normal function setup |
2. Normal Operation Indications
| Mode Display | Code | Description |
|---|---|---|
| CL | Cooling | Cooling mode operation |
| Ht | Heating | Heating mode operation |
| dF | Defrost | Defrost cycle active |
| PC | Power saving | Reduced capacity operation |
| Ln | Low noise | Quiet outdoor operation active |
| – | Stopped | Unit idle or off |
3. Function Modes Overview
Available Modes and Settings
| Classification | Mode Code | Function | Item No. | Description | Default |
|---|---|---|---|---|---|
| Monitor Mode | [F1] | System data view | 10–51 | View compressor speed, fan RPM, pressures, thermistors, and EEV pulse | – |
| Setting Mode | [F2] | Functional adjustments | 00–42 | Adjust installation, correction, and operation parameters | Factory defaults |
| Function Mode | [F3] | Service & reset functions | 00–31 | Perform test run, forced operation, or clear stored data | – |
| Error History | [F9] | Fault review | 00–03 | Displays last 4 logged errors with timestamp | – |
4. Key Function Settings – [F2] Mode
| Setting Function | Item No. | Options / Description | Default |
|---|---|---|---|
| Pipe Length Setting | 00 | 00 = 40–65m, 01 = 65–90m | 00 |
| Defrost Shift 1 | 13 | 00 = Normal, 01 = Hotter end temp, 02 = Cooler end temp | 00 |
| Defrost Shift 2 | 20 | 00 = Normal start, 01 = Longer start, 02 = Shorter start | 00 |
| Energy Saving Mode | 30 | 00 = Off, 01 = 75% capacity, 02 = 50% capacity | 00 |
| Low Noise Mode | 41 | 00 = Normal, 01 = Level 1, 02 = Level 2 | 00 |
| Low Noise Operation Level | 42 | 00 = Off, 01 = 3 dB reduction, 02 = 6 dB reduction, 03 = 9 dB reduction | 00 |
5. Function Mode – [F3]
Used primarily for testing, commissioning, and clearing data.
| Item No. | Function | Description |
|---|---|---|
| 00 | Cooling Test Run | Forced ON cooling operation |
| 01 | Heating Test Run | Forced ON heating operation |
| 02 | Stop Test Run | Terminates forced operation |
| 30 | Error History Clear | Clears all stored fault logs |
| 33 | Compressor Run Time Clear | Resets inverter compressor accumulated time |
| 50 | Field Setting Reset | Restores all values to factory defaults |
6. Error History Mode – [F9]
Displays recent system faults for diagnostics.
| Item No. | Display Meaning | Description |
|---|---|---|
| 00 | Latest Error | Most recent fault event |
| 01 | One Error Ago | Previous error |
| 02 | Two Errors Ago | Second previous fault |
| 03 | Three Errors Ago | Third previous fault |
| 04 | Four Errors Ago | Fourth previous fault |
Use this mode to cross-reference fault patterns with LED codes during troubleshooting.
7. Field Service Tips
To enter function mode, press MODE/EXIT repeatedly until the desired function (e.g., F1, F2, F3, F9) appears, then press ENTER.
Use SELECT to choose the item number and ENTER to confirm.
To exit, press MODE/EXIT until the normal display reappears.
Always record any modified parameters in the service log for traceability.