Can you keep using it?
Can you keep using it?
Contact customer support if any of these apply
- !B203 returns immediately after restart.
- !The printer cannot reach a ready state at all.
What to check first
Step-by-step checks
- 1
Safe first step
Turn the printer off, wait briefly, and power it back on.
Start with the official recovery step before moving on to parts or deeper servicing.
- 2
Safe first step
Retry one short job only if the printer returns to ready.
- 3
Safe first step
Do not keep forcing repeat jobs through the same fault state.
Background
What this message usually means
Canon uses support code B203 on MB5400-series printers for a more serious printer fault that stops normal operation. It is not a low-urgency maintenance warning and usually needs a restart first, then support if it comes straight back.
Diagnosis
Likely causes
A controller or print-system fault occurred.
The printer resumed from an error state and could not clear it cleanly.
A deeper internal hardware or supply-path issue stopped normal operation.
Service
When service or replacement is more likely
- -Treat repeated B203 returns as a support case rather than a user-maintenance issue.
See also
Related codes in this family
Explore more
More Canon printer families
Keep browsing
Where to go next
Source notes
Canon's MB5400-series support-code list includes B203 in the printer fault group that stops normal operation.
Built around Canon MB5400-series support-code guidance. Exact wording can vary a little by region and model variant.
Printer error codes can vary a little by firmware, region, and exact model variant. Use this guide as a family-level starting point and stop if the next step would require disassembly or service-mode changes.
Known family variants: MB5410, MB5420, MB5440, MB5450, MB5460, MB5490
Last reviewed: 2026-04-12
Reference: Open reference