OEM Service Manual: Daikin EWAD Air-Cooled Screw Chiller Service Manual. Available through Daikin Applied technical support.
37 codes
| Fault Code | Alarm Description | Severity | Probable Causes | Action |
|---|---|---|---|---|
| U0 | Refrigerant shortage detected | Warning | Refrigerant leak in system | View Details → |
| U1 | Three-phase power phase sequence error | Warning | Incoming power phase sequence reversed | View Details → |
| U2 | Power voltage abnormality | Warning | Power supply voltage too high or too low | View Details → |
| U4 | Indoor/outdoor communication abnormality | Warning | Communication cable between indoor and outdoor units damaged | View Details → |
| E0 | Outdoor unit high temperature protection | Warning | Condenser coil fouled reducing heat rejection | View Details → |
| E1 | Circuit board failure | Warning | Control board component failure | View Details → |
| E2 | Outdoor coil temperature sensor fault | Warning | Sensor element failure | View Details → |
| E3 | Compressor overload protection | Warning | Compressor motor drawing excessive current | View Details → |
| E4 | Compressor discharge temperature abnormal | Warning | Discharge temperature too high from compression ratio | View Details → |
| E5 | Compressor oil temperature abnormal | Warning | Oil temperature too high from bearing friction | View Details → |
| E6 | Compressor motor lock | Warning | Compressor mechanically seized | View Details → |
| E7 | DC fan motor abnormality | Warning | DC fan motor winding failure | View Details → |
| E8 | AC input voltage abnormality | Warning | Incoming power voltage outside specification | View Details → |
| EE | Drainage system fault | Warning | Drain pan clogged with debris | View Details → |
| H0 | Temperature sensor fault | Warning | Temperature sensor element failure | View Details → |
| H1 | High pressure switch activated | Critical | Discharge pressure exceeding safety limit | View Details → |
| H2 | Low pressure switch activated | Warning | Suction pressure below safety threshold | View Details → |
| H3 | Compressor oil level low | Critical | Oil lost through refrigerant leak | View Details → |
| U3 | Transmission fault (main to inverter) | Warning | Communication cable between main controller and inverter damaged | View Details → |
| U9 | Inverter overload | Warning | Inverter output current exceeding rated value | View Details → |
| A0 | Inverter compressor overcurrent | Critical | Compressor motor short circuit | View Details → |
| A1 | Inverter compressor overvoltage | Warning | DC bus voltage too high | View Details → |
| A2 | Inverter compressor undervoltage | Warning | DC bus voltage too low | View Details → |
| A3 | Inverter compressor overheating | Warning | Inverter heatsink temperature too high | View Details → |
| A4 | Inverter compressor current imbalance | Warning | Compressor motor winding imbalance | View Details → |
| A5 | Compressor discharge temperature too high (inverter) | Warning | Compression ratio too high | View Details → |
| A6 | Inverter compressor lock | Critical | Compressor mechanically seized | View Details → |
| A7 | Inverter compressor start failure | Warning | Compressor motor cannot start | View Details → |
| A8 | Inverter communication error | Warning | Communication cable between inverter and main controller fault | View Details → |
| A9 | Compressor motor temperature sensor fault | Warning | Motor winding temperature sensor failure | View Details → |
| L0 | Inverter system abnormality | Warning | Multiple inverter faults active | View Details → |
| L1 | Inverter PCB temperature sensor fault | Warning | Inverter board temperature sensor failure | View Details → |
| L2 | Inverter power supply abnormality | Warning | Inverter input voltage outside range | View Details → |
| L3 | Inverter散热器 overheat | Warning | Inverter heatsink temperature too high | View Details → |
| L4 | Inverter output short circuit | Warning | Short circuit detected on inverter output | View Details → |
| L5 | Inverter ground fault | Warning | Ground fault detected on inverter output | View Details → |
| L6 | Inverter output phase loss | Critical | One phase of inverter output missing | View Details → |
Disclaimer: All Daikin EWAD fault code data is for reference only. Do not use this information to replace certified professional HVAC technician judgment. Always refer to original OEM official service manual.