OEM Service Manual: Daikin AGZ Modular Scroll Chiller Service Manual. Available through Daikin Applied technical support.
30 codes
| Fault Code | Alarm Description | Severity | Probable Causes | Action |
|---|---|---|---|---|
| E1 | Compressor high pressure protection | Critical | Condenser airflow insufficient | View Details → |
| E2 | Compressor low pressure protection | Warning | Low refrigerant charge | View Details → |
| E3 | Compressor motor overload | Critical | Motor current too high | View Details → |
| E4 | Compressor discharge temperature high | Warning | Compression ratio too high | View Details → |
| E5 | Evaporator water flow fault | Warning | Water pump stopped | View Details → |
| E6 | Condenser water flow fault | Warning | Condenser pump stopped | View Details → |
| E7 | Evaporator water temperature low | Warning | Setpoint too low | View Details → |
| E8 | Temperature sensor fault | Warning | Sensor element failure | View Details → |
| E9 | Communication fault | Warning | Network cable fault | View Details → |
| E10 | Phase loss or reversal | Critical | Missing phase on power supply | View Details → |
| E11 | Overcurrent protection | Critical | Compressor motor overload | View Details → |
| E12 | Oil pressure low | Critical | Oil pump failure | View Details → |
| E13 | Oil level low | Critical | Oil leak in system | View Details → |
| E14 | Expansion valve fault | Warning | Electronic expansion valve motor failure | View Details → |
| E15 | Power supply fault | Warning | Voltage outside specification | View Details → |
| E16 | Condenser fan motor overload | Critical | Fan motor bearing failure | View Details → |
| E17 | Evaporator fan motor overload | Critical | Evaporator fan motor bearing wear | View Details → |
| E18 | Compressor contactor fault | Warning | Contactor coil failure | View Details → |
| E19 | Expansion valve driver fault | Warning | Expansion valve driver board failure | View Details → |
| E20 | Condenser coil temperature high | Warning | Condenser coil fouled | View Details → |
| E21 | Evaporator coil temperature low | Warning | Evaporator coil frosting | View Details → |
| E22 | High discharge superheat | Warning | Refrigerant charge low | View Details → |
| E23 | Low discharge superheat | Warning | Expansion valve overfeeding | View Details → |
| E24 | Oil separator fault | Warning | Oil separator float valve stuck | View Details → |
| E25 | Liquid line solenoid valve fault | Warning | Solenoid valve coil failure | View Details → |
| E26 | Hot gas bypass valve fault | Warning | Hot gas bypass valve actuator failure | View Details → |
| E27 | Crankcase heater fault | Warning | Crankcase heater element failure | View Details → |
| E28 | Sight glass moisture indicator | Warning | Moisture detected in refrigerant system | View Details → |
| E29 | Water pump interlock fault | Warning | Water pump running signal lost | View Details → |
| E30 | Remote panel communication fault | Warning | Remote panel communication cable damaged | View Details → |
Disclaimer: All Daikin AGZ 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.