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Error Code Meanings

  1. Input Power Faults (Solar/DC Side)

These errors mean the electricity coming from your solar panels is outside of the safe operating range.

E1: Solar Input Overload vs. E2: Solar Input Over Voltage

  • The Difference: E1 means the total Wattage (power) from the sun is too high for the inverter's capacity. E2 means the Voltage (electrical pressure) is too high, which can physically damage the unit's internal components.
  • Troubleshooting Steps:
    1. Check the Specification Sticker: Find the "Max VOC" (Voltage Open Circuit) rating on the right side of your inverter.
    2. Use a Multimeter for Voltage (E2): Set your multimeter to DC Voltage and measure the bare pins of the solar input wires.
    3. Reduce Panels: If the reading is over 450V (for 230V systems) or 900V (for 380V systems), you must remove panels from the string to lower the voltage.
    4. Check Panel Specs (E1): If the voltage is okay but E1 persists, ensure your solar array is not significantly oversized (generally no more than 2x the pump motor's power).

E10 / OFF (Low Voltage): Solar Input Low Voltage

  • The Meaning: This is the opposite of E2; there is not enough sunlight or enough panels connected to "wake up" the inverter.
  • Troubleshooting Steps:
    1. Check DC Voltage: Measure the DC input with a multimeter. If it is below the Minimum DC input voltage on the sticker, the system will stay on the boot logo or show this error.
    2. Wait for Sun: Ensure it is not early morning, late evening, or extremely cloudy.

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  1. Output & Motor Faults (AC Side)

These errors occur between the inverter and the pump motor.

E4: AC Out Short Circuit vs. E8: AC Output Overload

  • The Difference: E4 is an immediate safety stop caused by a Short Circuit (metal touching metal or a total insulation failure). E8 is an Overload where the pump is running but working too hard, drawing more current than the inverter can provide (often due to a jam or heavy mud/sand).
  • Troubleshooting Steps:
    1. Check for External Switches: Remove any breakers or manual switches installed between the inverter and the pump, as these trigger E4.
    2. Measure Motor Resistance (Ohms): Set multimeter to . Measure U-V, V-W, and U-W. 3-phase readings must be identical; single-phase readings must add up (lowest two sum to the highest). If readings differ by >1 Ohm, the motor or cable has failed.
    3. Perform a No-Load Test: Unplug the pump and restart the inverter. If it reaches 50Hz without the error, the inverter is healthy and the problem is in the pump/cable.

E64 / E7: AC Output Phase Lost

  • The Meaning: One of the three power wires (U, V, or W) is disconnected or broken.
  • Troubleshooting Steps:
    1. Check Connections: Ensure all wires are firmly screwed into the terminals or that the AC plug is fully seated.
    2. Ohm Test for Breaks: Measure resistance between wire pairs. If any pair shows "OL" (Open Loop), that wire is physically broken inside the cable.
    3. Check Phase Settings: Ensure the inverter is set to "Single" phase for 2-wire motors or "Three" phase for 3-wire motors (Password 9578).

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  1. Internal & Temperature Faults

E16 / E5: Inverter Over Temperature

  • The Meaning: The internal components have reached 70°C.
  • Troubleshooting Steps:
    1. Check Installation: Ensure the unit is Vertical and has 1.1m of clearance for air flow.
    2. Shade the Unit: Move the inverter out of direct sunlight or provide a ventilated cover.
    3. Clean Fans: Check the cooling fans for spider webs or debris. If the screen shows a temperature above 45°C, the fans should be spinning.

E32: Hardware Power Supply Error

  • The Meaning: A critical failure of the internal circuit boards.
  • Troubleshooting Steps:
    1. Power Cycle: Turn the solar isolator off for 1 minute and back on.
    2. Contact Support: If the error persists, the internal PCB (Printed Circuit Board) needs replacement. Take a photo of the error and the inverter's Serial ID for technical support.

E128: Software Error

  • The Meaning: The inverter's internal programming has glitched or become corrupted.
  • Troubleshooting Steps:
    1. Perform a Factory Reset: Access settings with password 0000 (or 9590), scroll to "11. Factory Reset," and select Enter.
    2. Re-program: You will need to re-enter your specific pump settings (voltage, Hz, current) after a reset.