Canon Printer Cannot Print RX Data

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If your Canon printer displays the error message “Cannot print RX data”, it typically means the printer is unable to print a received fax due to an issue such as:

  • Paper size or type mismatch
  • Empty paper tray or low ink/toner
  • Memory full (too many faxes stored)
  • Fax-related settings conflict

This issue is most common on Canon fax-capable models like imageCLASS, PIXMA, and MAXIFY printers with fax functionality.

1. Understand the “RX Data” Error

“RX Data” stands for “Received Data“. When a Canon printer says it “cannot print RX data”, it means:

  • The fax was successfully received,
  • But the printer couldn’t print it due to an internal or setup issue.

2. Check Paper Supply and Tray Settings

Make Sure:
  • The correct paper size and type is loaded in the tray.
  • The tray is not empty, misaligned, or incorrectly loaded.
  • The printer is set to use the correct tray for fax output.

Adjust Paper Settings:
  1. On the printer’s control panel, go to:
    Settings > Paper Settings > Cassette/Tray Settings
  2. Set the tray to match the paper size expected for fax printing (typically A4 or Letter).
  3. Confirm that Auto Select is enabled (if applicable).

3. Check for Ink or Toner Issues
  • Ensure ink or toner levels are sufficient, especially black.
  • Replace empty or nearly empty cartridges.
  • If ink is low, the printer may receive but not print faxes to avoid blank pages.

4. Verify Fax Print Settings

Go to the fax settings on the printer:

  1. Navigate to Fax Settings > RX Settings > Auto Print
  2. Make sure Auto Print Received Faxes is set to ON
  3. Confirm that Fax Output Settings (paper size/type/tray) are correctly configured

5. Check for Memory Full or RX Data Stored

If the printer’s memory is full, it won’t print new faxes.

Clear Memory:
  • Print or delete stored faxes:
    • Fax Menu > Memory Reference > Print Documents in Memory
    • Or use the Remote UI (via browser) to manage stored fax data
  • Delete old or failed fax jobs if possible

6. Match Paper Size with Fax Settings

If the fax was sent using a different paper size (e.g., Legal) and your printer only has A4 or Letter loaded:

  • Go to:
    Fax Settings > RX Settings > Auto Reduction
  • Enable Auto Reduction so that incoming pages are resized to fit the loaded paper
  • Disable “Check Paper Size Before Printing” if it’s causing blocks

7. Print the Fax Manually from Memory

If automatic printing fails, try printing the received fax manually.

Steps:
  1. Go to Fax Menu > Memory Reference > Print Documents in Memory
  2. Select the fax you want to print
  3. Choose Print and verify output

8. Restart the Printer
  1. Power off the printer
  2. Unplug for 30 seconds
  3. Plug back in and turn it on
  4. Retry printing the stored fax

9. Update Firmware (Optional)

If the issue persists, it could be a firmware bug, especially on newer OS setups.

  1. Go to Canon Support
  2. Enter your printer model
  3. Download and install the latest firmware update
  4. Follow on-screen instructions carefully

10. When to Contact Canon Support

Contact Canon support if:

  • You have confirmed paper and ink are fine but the printer still won’t print RX data
  • You cannot clear fax memory errors
  • The fax hardware appears unresponsive or buggy
  • You need assistance accessing memory data or advanced fax logs

Canon may guide you through recovery steps or recommend service/repair options if hardware-related issues are found.

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