Canon Support Code 1851: Inner cover is open for normal printing

Usually fixable yourself. Rarely. Canon lists no repair step for this code. If it keeps coming back after the steps above, contact Canon support.

✅ Usually fixable yourself

The inner cover (disc tray cover) is open while a normal (non-disc) print job is starting.

What to try

Rarely. Canon lists no repair step for this code. If it keeps coming back after the steps above, contact Canon support.

Canon documents this code for models including PIXMA MX920 series, PIXMA TS8300 series, PIXMA TS9100 series.

Write down the exact code before you do anything else — similar-looking codes often mean completely different things.
Power the printer off, unplug it for a couple of minutes, then power it back on. A surprising number of transient errors clear here.
Open the covers and check for paper scraps, packaging material, or anything blocking the carriage.
Check the cartridges or tanks are genuine, correctly seated, and not empty.
Confirm the printer is plugged directly into a wall outlet, not a power strip or extension lead.
Check your model’s own manual — codes are model-specific, and the manual is the authority for your machine.

Source: Canon Inkjet Manual - PIXMA MX920 series, support code 1851. Codes are model-specific, so your own model's manual is the final word. Reviewed October 2026.

Tell our printer technician your model and what you've tried. You'll find out whether it's fixable at home or worth repairing at all.

Eric Paul Amora · Printer & Hardware Repair Technician