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BOARD REPAIR, NOT REPLACEMENT

We restore original components at micro-level, saving up to 70% compared to replacement costs — professional diagnostics right here in Casalmaggiore.

12 MONTHS FULL WARRANTY

The only service in Italy offering a complete year warranty on repaired solar inverters — your guarantee of long-lasting performance and peace of mind.

RAPID ENERGY RESTORATION

Get your inverters back online within 24-48 hours with complete testing — every day your solar system is down means lost revenue.

Photovoltaic Inverter Repair & Diagnostics

  • In-depth diagnostics of inverter failures — including internal explosions, burnt PCBs, and severe hardware faults
  • Root-cause analysis using oscilloscopes, logic analyzers, and load simulations
  • Detection and elimination of software-related faults: EEPROM corruption, firmware bugs, and error code resolution
  • Repair of MPPT modules, power stages, gate drivers, and signal path anomalies
  • Troubleshooting of grid synchronization, DC link stability, and AC waveform distortion
  • Detailed failure reports, waveform captures, and high-resolution photos of defective areas

Inverter Component Restoration & Upgrades

  • Replacement of IGBTs, MOSFETs, optocouplers, control ICs, and passive components
  • Micro-soldering and trace repair for severely damaged circuit boards
  • Custom replacement of rare or obsolete components using 3D-printed or CNC-machined parts
  • Rebuilding of cooling systems: fan units, thermal paste, and heat sink realignment
  • Reinforcement against future failures: conformal coating, transient suppression modules, and enhanced insulation paths
  • Optional firmware optimization for extended inverter lifespan and better grid behavior
  • Includes post-repair testing, load simulation, and full technical documentation with results

Advanced Inverter Diagnostics

  • Complete diagnostics using professional Fluke and Tektronix equipment
  • Electrical parameter analysis with 0.1% precision accuracy
  • Thermal imaging diagnostics to detect hidden defects
  • Insulation and grounding testing according to VDE standards
  • Detailed report with photographic documentation of all problem areas

Control Board Reprogramming

  • Factory firmware restoration for all inverter brands
  • EEPROM and Flash memory programming
  • Software adaptation for specific operating conditions
  • Firmware updates to latest versions
  • Original settings backup and recovery

PCB Board Restoration

  • Circuit trace restoration using micro-soldering techniques
  • BGA component replacement on professional rework stations
  • CPU and microchip reballing services
  • Contact pad restoration and repair
  • Protective coating application against corrosion

Final Quality Testing

  • Complete safety function verification
  • Overload condition testing
  • Calibration of all measurement circuits
  • Quality certificate with comprehensive test protocols

List of errors on the inverter Delta Solivia

By Erik Zaikin
4 min read

1. Errors

  1. AC Freq High

    • Description: The grid frequency is too high.
    • Solution: Check the network frequency on the inverter terminal and verify the local settings.

  2. AC Freq Low

    • Description: The grid frequency is too low.
    • Solution: Check the network frequency on the inverter terminal and verify the local settings.

  3. Grid Quality

    • Description: Poor quality of the grid.
    • Solution: Check the harmonics of the network voltage. The inverter’s connection may need to be distanced from non-linear loads.

  4. HW Connect Fail

    • Description: Unable to detect the network sequence.
    • Solution: Verify the AC connection in accordance with the instructions. Contact the installation technician or DELTA technical support.

  5. No Grid

    • Description: Network voltage is below 100 V.
    • Solution: Check the AC connector connection, ensure it is connected to the inverter, and verify that the AC switch is turned on.

  6. AC Volt Low

    • Description: The voltage of phase L1, L2, or L3 is too low.
    • Solution: Check the network voltage connection at the inverter terminal and review local settings.

  7. AC Volt High

    • Description: The voltage of phase L1, L2, or L3 is too high.
    • Solution: Check the network voltage connection at the inverter terminal and review local settings.

  8. Solar1 High

    • Description: DC1 voltage exceeds 1000 V.
    • Solution: Modify the solar array settings to reduce the open-circuit voltage to less than 1000 VDC.

  9. Solar2 High

    • Description: DC2 voltage exceeds 1000 V.
    • Solution: Modify the solar array settings to reduce the open-circuit voltage to less than 1000 VDC.

2. Faults

  1. HW DC Injection

    • Description: DC injection is too high.
    • Solution: Check the grid waveform and ensure the inverter’s connection is not too close to a non-linear load. Contact support if needed.

  2. Temperature

    • Description: The ambient temperature, heatsink, or coil is outside the normal operating range (too high or too low).
    • Solution: Verify that the installation environment meets the required conditions.

  3. 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. Firmware Fail

    • Description: Incompatible firmware.
    • Solution: Contact the installation technician or DELTA technical support.

  5. HW DSP ADC1, HW DSP ADC2, HW DSP ADC3

    • Description: DSP A/D fault (affecting network voltage/output current, input voltage/bus voltage, or input current/boost current).
    • Solution: Contact the installation technician or DELTA technical support.

  6. HW Red ADC1, HW Red ADC2

    • Description: A/D reduction fault (affecting network voltage/inverter voltage or output current).
    • Solution: Contact the installation technician or DELTA technical support.

  7. HW Efficiency

    • Description: Efficiency is abnormal.
    • Solution: Contact the installation technician or DELTA technical support.

  8. HW COMM2, HW COMM1

    • Description: Communication failure with the reduced CPU or digital signal processor.
    • Solution: Contact the installation technician or DELTA technical support.

  9. Ground Current

    • Description: The residual current is too high.
    • Solution: Check the insulation of the solar inputs and ensure the capacitance between (+ ↔ GND and – ↔ GND) is less than 2.5 μF. Install an external transformer if necessary, then contact support.

  10. Insulation

    • Description: The insulation of the array is not adequate.
    • Solution: Check the insulation of the solar inputs and contact support.

  11. HW Connected Fail

    • Description: Internal AC wire is disconnected.
    • Solution: Contact the installation technician or DELTA technical support.

  12. RCMU Fail

    • Description: Fault in the residual current monitoring hardware unit.
    • Solution: Contact the installation technician or DELTA technical support.

  13. Relay Test Short / Relay Test Open

    • Description: One or more relays are defective (either short-circuited or open-circuited).
    • Solution: Contact the installation technician or DELTA technical support.

  14. Bus Unbalance

    • Description: Unbalance in the bus voltage.
    • Solution: Check input connections and the insulation of the PV array, then contact support.

  15. HW Bus OVR / HW Bus UVR

    • Description: The BUS, BUS+, or BUS– voltage is too high or too low.
    • Solution: Check the input connections, verify the insulation of the PV array, and contact support. Also, adjust the solar array settings to reduce the open-circuit voltage to less than 1000 VDC if necessary.

  16. AC Current High

    • Description: The current of phase L1, L2, or L3 is too high.
    • Solution: If the issue persists, contact the installation technician or DELTA technical support.

  17. HW CT A Fail, HW CT B Fail, HW CT C Fail

    • Description: Fault in the current sensor of phase L1, L2, or L3.
    • Solution: If the issue persists, contact the installation technician or DELTA technical support.

  18. HW AC OCR

    • Description: The output current exceeds the hardware limit.
    • Solution: If the issue persists, contact the installation technician or DELTA technical support.

  19. Inverter Fault

    • Description: General inverter fault.
    • Solution: If the issue persists, contact the installation technician or DELTA technical support.

  20. HW ZC Fail

    • Description: Fault in the zero-crossing circuit hardware.
    • Solution: Contact the installation technician or DELTA technical support.

  21. DC Current High

    • Description: The DC1 or DC2 current is too high.
    • Solution: If the issue persists, contact the installation technician or DELTA technical support.

3. Warnings

  1. HW FAN

    • Description: The fan is blocked or broken during operation.
    • Solution: Remove any objects obstructing the fans, replace any defective fans, and check all fan connections.

  2. Solar1 Low, Solar2 Low

    • Description: The DC1 or DC2 voltage is too low.
    • Solution: Check the DC voltage connection to the inverter terminal and verify that all switching devices in boost1 or boost2 are operating correctly.

4. Models

  • EUG Series:
    2.5EUG3TR, 3.0EUG3TR, 3.3EUG3TR, 3.6EUG3TR, 5.0EUG3TR
    2.5EUG4TR, 3.0EUG4TR, 3.3EUG4TR, 3.6EUG4TR, 5.0EUG4TR

  • SI Series:
    SI3300, SI2500, SI5000

  • EUT Series:
    6.0EUT4TL, 8.0EUT4TL, 10EUT4TL

  • Additional Models:
    11EUG4TR, 12EUT4TL, 15EUG4TL, 15EUG3TL, 20EUG4TL, 20EUG3TL, 30EUT4TL

  • Other Series:
    SOLIVIA CENTRAL, CS44EUG3, CS55EUG3, CS66EUG3, CM77EUG3, CM88EUG3, CM100EUG3

  • FLEX Series:
    H2.5FLEX, H3AFLEX, H4AFLEX, H5AFLEX
    M6A, M8A, M10A, M15A, M20A, M30A, M50A, M88H, M125HV, FLEX

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