**Errors:**
1. **Error Code**: AC Freq High
- **Description**: The grid frequency is too high.
- **Solution**: Check the network frequency on the inverter terminal. Check local settings.
2. **Error Code**: AC Freq Low
- **Description**: The grid frequency is too low.
- **Solution**: Check the network frequency on the inverter terminal. Check local settings.
3. **Error Code**: Grid Quality
- **Description**: Poor quality of the grid.
- **Solution**: Check the harmonics of the network voltage. The inverter's connection to the network may need to be distanced from a non-linear load.
4. **Error Code**: HW Connect Fail
- **Description**: Unable to detect the network sequence.
- **Solution**: Check the AC connection; it must comply with the instructions. Contact the installation technician or DELTA technical support.
5. **Error Code**: No Grid
- **Description**: Network voltage < 100 V.
- **Solution**: Check the AC connector connection, ensure it is connected to the inverter and that the AC switch is On.
6. **Error Code**: AC Volt Low
- **Description**: The voltage of phase L1, L2, or L3 is too low.
- **Solution**: Check the network voltage connection to the inverter terminal. Check local settings.
7. **Error Code**: AC Volt High
- **Description**: The voltage of phase L1, L2, or L3 is too high.
- **Solution**: Check the network voltage connection to the inverter terminal. Check local settings.
8. **Error Code**: Solar1 High
- **Description**: DC1 voltage > 1000 V.
- **Solution**: Modify the solar array settings and reduce the open-circuit voltage to less than 1000 VDC.
9. **Error Code**: Solar2 High
- **Description**: DC2 voltage > 1000 V.
- **Solution**: Modify the solar array settings and reduce the open-circuit voltage to less than 1000 VDC.
**Faults:**
1. **Error Code**: HW DC Injection
- **Description**: DC injection is too high.
- **Solution**: Check the waveform of the grid. The inverter's connection to the network may need to be distanced from a non-linear load. Contact the installation technician or DELTA technical support.
2. **Error Code**: Temperature
- **Description**: The ambient temperature, heatsink, or coil is too high or low relative to the normal operating range.
- **Solution**: Check the installation environment.
3. **Error Code**: HW NTC1 Fail, HW NTC2 Fail, HW NTC3 Fail, HW NTC4 Fail
- **Description**: Temperature sensor 1, 2, 3, or 4 is faulty.
- **Solution**: Contact the installation technician or DELTA technical support.
4. **Error Code**: Firmware Fail
- **Description**: Firmware not compatible.
- **Solution**: Contact the installation technician or DELTA technical support.
5. **Error Code**: HW DSP ADC1, HW DSP ADC2, HW DSP ADC3
- **Description**: DSP A/D Fault – network voltage or output current, input voltage or bus voltage, input current or boost current.
- **Solution**: Contact the installation technician or DELTA technical support.
6. **Error Code**: HW Red ADC1, HW Red ADC2
- **Description**: A/D Reduction Fault – network voltage or inverter voltage, output current.
- **Solution**: Contact the installation technician or DELTA technical support.
7. **Error Code**: HW Efficiency
- **Description**: Efficiency is abnormal.
- **Solution**: Contact the installation technician or DELTA technical support.
8. **Error Code**: HW COMM2, HW COMM1
- **Description**: Unable to communicate with the reduced CPU or digital signal processor.
- **Solution**: Contact the installation technician or DELTA technical support.
9. **Error Code**: Ground Current
- **Description**: The residual current is too high.
- **Solution**: Check the insulation of the solar inputs. Check the capacity (+ <-> GND and - <-> GND), it must be < 2.5 μF. Install an external transformer if necessary. Contact the installation technician or DELTA technical support.
10. **Error Code**: Insulation
- **Description**: The insulation of the array is not adequate.
- **Solution**: Check the insulation of the solar inputs. Contact the installation technician or DELTA technical support.
11. **Error Code**: HW Connected Fail
- **Description**: Internal AC wire disconnected.
- **Solution**: Contact the installation technician or DELTA technical support.
12. **Error Code**: RCMU Fail
- **Description**: Fault in the residual current monitoring hardware unit.
- **Solution**: Contact the installation technician or DELTA technical support.
13. **Error Code**: Relay Test Short, Relay Test Open
- **Description**: One or more relays are defective - short circuit or open circuit.
- **Solution**: Contact the installation technician or DELTA technical support.
14. **Error Code**: Bus Unbalance
- **Description**: Unbalance of the bus voltage.
- **Solution**: Check the connections of the inputs. Check the insulation of the PV array. Contact the installation technician or DELTA technical support.
15. **Error Code**: HW Bus OVR, HW Bus UVR
- **Description**: The BUS, BUS+, or BUS- voltage is too high or too low.
- **Solution**: Check the connections of the inputs. Check the insulation of the PV array. Contact the installation technician or DELTA technical support. Modify the solar array settings and reduce the open-circuit voltage to less than 1000 VDC.
16. **Error Code**: AC Current High
- **Description**: The current of phase L1, L2, or L3 is too high.
- **Solution**: Contact the installation technician or DELTA technical support if it does not return to normal operation.
17. **Error Code**: HW CT A
Fail, HW CT B Fail, HW CT C Fail
- **Description**: Fault in the current sensor L1, L2, or L3.
- **Solution**: Contact the installation technician or DELTA technical support if it does not return to normal operation.
18. **Error Code**: HW AC OCR
- **Description**: The output current exceeds the hardware limit.
- **Solution**: Contact the installation technician or DELTA technical support if it does not return to normal operation.
19. **Error Code**: Inverter Fault
- **Description**: Inverter fault.
- **Solution**: Contact the installation technician or DELTA technical support if it does not return to normal operation.
20. **Error Code**: HW ZC Fail
- **Description**: Fault in the hardware of the zero-crossing circuit.
- **Solution**: Contact the installation technician or DELTA technical support.
21. **Error Code**: DC Current High
- **Description**: The DC1 or DC2 current is too high.
- **Solution**: Contact the installation technician or DELTA technical support if it does not return to normal operation.
**Warnings:**
1. **Error Code**: HW FAN
- **Description**: The fan is blocked or broken during operation.
- **Solution**: Remove the object blocking the fans. Replace defective fans. Check the connections of all fans.
2. **Error Code**: Solar1 Low, Solar2 Low
- **Description**: The DC1 or DC2 voltage is too low.
- **Solution**: Check the connection of the DC1 or DC2 voltage to the inverter terminal. Check all the switching devices in boost1 or boost2.
Models: 2.5EUG3TR
3.0EUG3TR
3.3EUG3TR
3.6EUG3TR
5.0EUG3TR
2.5EUG4TR
3.0EUG4TR
3.3EUG4TR
3.6EUG4TR
5.0EUG4TR
SI3300
SI2500
SI5000
6.0EUT4TL
8.0EUT4TL
10EUT4TL
11EUG4TR
12EUT4TL
15EUG4TL
15EUG3TL
20EUG4TL
20EUG3TL
30EUT4TL
SOLIVIA CENTRAL
CS44EUG3
CS55EUG3
CS66EUG3
CM77EUG3
CM88EUG3
CM100EUG3
H2.5FLEX H3AFLEX H4AFLEX H5AFLEX
M6A M8A M10A M15A M20A M30A M50A M88H M125HV
FLEX