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Warn code 304 (CT Open)

Updated

Before troubleshooting

For installations involving an inverter and smart meter:

  • MIN 7000 -10000 TL-X (Single Phase Inverter) ONLY
  • Cable CT 

Prior to troubleshooting Warn code 304, please verify the following:

  1. Confirm that the wiring between the smart meter and inverter is accurately connected.
  2. Ensure the correct pin configuration on the smart meter.
  3. Check the plug and pins used on the inverter.
  4. Examine the connection integrity between the inverter and smart meter.

Root

Root: This warn code has been removed after the DSP firmware version AMAA04xx.

 

Possible reasons of causing the fault

  • Wiring issue: The wiring between inverter and the Cable CT is incorrect.
  • Plug issue: There might be a damage on the SYS COM port.
  • CT issue: The Cable CT is faulty.
  • CT issue: The CT clamp is clamped on the wrong cable in switchboard.

Solutions

Only MIN 7000 -10000 TL-X (Single Phase Inverter) can use Cable CT to do the export limit.

  1. Disconnect the data plug from the SYS COM port on the inverter, then carefully open the cover of the data plug, ensuring not to damage the cables.
  2. Check to see if the SYS COM port is damaged or broken.
  3. Check if the data plug, identified by the side with pins, is broken or damaged.
  4. Update the inverter DSP firmware to AMAA04xx or the above version.
  5. Check the wiring between inverter and cable CT, better ask for the picture of the connection.
  6. Advice using smart meter instead of the Cable CT. 

Contact Information:

Growatt New Energy Australia Pty Ltd

Terms and Conditions:

  • Licensed Electrician Requirement:

    • All electrical work, including but not limited to measurements, cable removal, plug handling, installation, and maintenance, must be conducted by a licensed electrician in Australia.

  • Warranty Claim Application:

    • A warranty claim application must be lodged before replacing the unit. The application should include detailed documentation and evidence of the issue (e.g., photos, error logs).

  • Replacement Unit Provision:

    • The replacement unit should be provided by Growatt New Energy Australia Pty Ltd. The replacement process should follow their guidelines and procedures.

  • Confirmation Before Application:

    • Confirmation must be granted by Growatt New Energy Australia Pty Ltd before lodging the warranty claim application. Ensure all steps for diagnosis and troubleshooting are followed as per Growatt's guidelines.

  • Safety Compliance:

    • All work must comply with Australian safety standards and regulations. Proper safety measures must be taken during the diagnosis, repair, and replacement process.

  • Documentation and Evidence:

    • Keep detailed records of all measurements, tests, and actions taken during the troubleshooting process. This includes voltage readings, error codes, firmware versions, and any communications with Growatt's support team.

  • Professional Conduct:

    • The licensed electrician must follow professional conduct standards, ensuring no damage to the system or property. All work must be done with care to avoid voiding the warranty.

  • Post-Replacement Testing:

    • After replacing the inverter, perform comprehensive testing to ensure the new unit is functioning correctly. Document the results and report them to Growatt New Energy Australia Pty Ltd.

  • Customer Communication:

    • Keep the customer informed throughout the process. Provide clear explanations of the issue, the steps being taken, and any necessary actions they need to follow.

  • Follow-up Support:

    • Offer follow-up support to the customer to ensure the problem is fully resolved and the system is operating normally. Provide contact information for any future issues or questions.

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