1203 is a support code documented for Canon PIXMA TR4720, Canon PIXMA TR4722. The output cover was opened during a print job.
What this support code means
The output cover was opened during a print job.
Applies to: Canon PIXMA TR4720, Canon PIXMA TR4722. Do not reuse the same code on an unrelated model.
What to try, in order
- Carefully remove any remaining paper as the manual directs.
- Close the cover and select OK. Resubmit an interrupted page if necessary.
After each step, repeat the action that produced the message. If it clears, you can stop.
When to stop
Stop if the instructed check does not apply, access requires disassembly, or the error persists after the documented steps.
Do not buy a part from the code alone. Check the exact model and manufacturer's part list if a replacement is actually required.
Models covered by this source
Official sources
These links identify the source and its scope. Check the manufacturer page again before changing a printer setting or buying a part.
- Canon — TR4700 series support code 1203 Checked 2026-11-01; official full page
Useful next steps
Found a mismatch? Request a correction with the public source URL and exact model, without passwords or full serial numbers.