B20B is a support code documented for Canon PIXMA TR4720, Canon PIXMA TR4722. A repair-required printer error has occurred.
What this support code means
A repair-required printer error has occurred.
Applies to: Canon PIXMA TR4720, Canon PIXMA TR4722. Do not reuse the same code on an unrelated model.
What to try, in order
- Turn off the printer, disconnect power, and arrange Canon service.
After each step, repeat the action that produced the message. If it clears, you can stop.
Service boundary
The source marks this as a service condition. Do not use a generic reset utility, open a sealed unit or shop for an unrelated cartridge to suppress it. Record the complete message and contact the manufacturer with the exact model.
When to stop
Stop if the instructed check does not apply, access requires disassembly, or the error persists after the documented steps.
- Disconnecting power can erase stored fax data; review the model manual before unplugging.
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 B20B 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.