Canon support code 1684 means the ink or FINE cartridge cannot be recognized on the cited PIXMA family.
What 1684 means
Canon support code 1684 means the ink or FINE cartridge cannot be recognized on the cited PIXMA family.
What you may notice
- Printing stops
- The Alarm lamp flashes
- A support code appears on the computer
- The condition returns after Resume
Most likely causes
- 01The cartridge is incompatible
- 02It is not seated
- 03Contacts are contaminated or damaged
- 04A refilled cartridge is not recognized
- 05The holder electronics have a fault
Safe checks, in order
Start with the simplest non-invasive check. Stop as soon as the error clears; repeated resets can hide a condition without correcting it.
Identify the cartridge
Use the on-screen message or lamp pattern.
Reseat it
Remove and reinstall only after the holder stops.
Confirm the part number
Match the exact printer model and region.
Replace if needed
Install a new compatible cartridge.
Know where to stop
Do not scrape contacts, bypass cartridge sensing, or handle leaking cartridges without care.
When to call a technician or support
Contact Canon if the code remains after the approved checks, the carriage or holder will not move normally, or visible hardware is damaged.
When you call, have the exact product or vehicle model, model year where relevant, the complete code or symbol, and when it appeared.
Where this information came from
We use the manufacturer's current published guidance as the starting point, then organize it into a safer, beginner-friendly sequence.
Canon PIXMA manual — support-code table Source last checked August 16, 2026. Manufacturer instructions and model manuals take priority over this independent summary.