1686 is a support code documented for Canon PIXMA TR4720, Canon PIXMA TR4722. The printer reports an issue involving one or more color cartridges; this is not a reliable full/empty diagnosis.
What this support code means
The printer reports an issue involving one or more color cartridges; this is not a reliable full/empty diagnosis.
Applies to: Canon PIXMA TR4720, Canon PIXMA TR4722. Do not reuse the same code on an unrelated model.
What to try, in order
- Check the message and identify the affected cartridge. Replace it when appropriate.
- Optional only: Canon documents holding Stop for at least five seconds to continue with remaining ink while disabling remaining-ink detection. Read the consequences before choosing this.
After each step, repeat the action that produced the message. If it clears, you can stop.
Does this call for a replacement?
The message alone does not justify buying a part. Complete the documented installation or cleaning checks first; consider the exact OEM number only if the manufacturer procedure then calls for it.
Part pages contain paid Amazon search links only after the diagnostic context; no seller or retail item is verified by this error code.
When to stop
Stop if the instructed check does not apply, access requires disassembly, or the error persists after the documented steps.
- Disabling ink monitoring does not restore ink; output can deteriorate. Keep this optional and never auto-select it.
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 1686 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.