Canon fax line l100 error ng

Troubleshooting the Canon Fax Line L100: Understanding and Resolving the ‘NG’ Error

The Canon Fax Line L100 is a popular choice for businesses and individuals seeking a reliable fax machine. However, users may occasionally encounter an ‘NG’ error on their device. This error can be frustrating, but understanding its causes and solutions can help get your fax machine back to optimal functionality quickly.

What Does ‘NG’ Error Mean on Canon Fax Line L100?

The ‘NG’ error on a Canon Fax Line L100 indicates a transmission failure. ‘NG’ stands for ‘No Good’ or ‘Not Good,’ a generic error message that essentially means the fax was not successfully sent. This error is often accompanied by an error code or message that provides more specific information about the nature of the problem.

Common Causes of the ‘NG’ Error

  1. Connection Issues: The most common cause is a problem with the phone line connection. This could be due to a loose cable, a problem with the phone service, or issues with the line quality.
  2. Busy Receiver Line: If the receiver’s line is busy or not answering, the fax cannot be transmitted, resulting in an ‘NG’ error.
  3. Incorrect Fax Number: Dialing an incorrect fax number can also lead to this error.
  4. Memory Issues: If the fax machine’s memory is full, it may fail to send faxes, displaying an ‘NG’ error.
  5. Hardware Problems: Less commonly, the issue may be due to hardware malfunctions within the fax machine itself.

Steps to Resolve the ‘NG’ Error

  1. Check the Connection: Ensure that the phone line is securely connected to the fax machine. If you have a spare line, try using it to determine if the issue is with the original line.
  2. Redial the Number: If the line was busy or not answering, wait a few minutes and try sending the fax again.
  3. Clear the Memory: If the machine’s memory is full, try deleting some of the stored faxes or data to free up space.
  4. Restart the Machine: Sometimes, simply turning the fax machine off and on again can resolve temporary glitches causing the ‘NG’ error.
  5. Check for Error Codes: If there is an additional error code displayed with ‘NG,’ refer to the user manual or Canon’s support website for specific troubleshooting related to that code.
  6. Contact Support: If none of the above steps work, it may be necessary to contact Canon support for further assistance or to arrange for a service if a hardware issue is suspected.

Preventing Future ‘NG’ Errors

  1. Regular Maintenance: Regularly clean and maintain your fax machine to prevent hardware issues.
  2. Firmware Updates: Keep your fax machine’s firmware up to date to ensure compatibility and functionality.
  3. Regularly Check Memory: Regularly monitor the machine’s memory usage and manage stored faxes to prevent memory overflow.
  4. Train Staff: Ensure that everyone using the fax machine is trained on correct usage and basic troubleshooting.


The ‘NG’ error on a Canon Fax Line L100 can be a nuisance, but it is often easily resolved with some basic troubleshooting. By understanding the common causes and solutions for this error, users can quickly rectify the issue and minimize downtime. Regular maintenance and proper usage of the fax machine can also help in preventing such errors in the future.

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