Lexmark C2335/CS531/CS632/CS639 printer platform — 31.35
Lexmark 31.35 means the waste-toner bottle is not installed/seated correctly. The guidance here is specific to C2335/CS531/CS632/CS639 printer platform and the Waste toner operation.
Error meaning
The waste-toner bottle is not installed/seated correctly.
This interpretation is tied to the reviewed family/platform and subsystem. Do not reuse the code by itself on another printer family.
Applies to
C2335/CS531/CS632/CS639 printer platform
- C2335
- CS531
- CS632
- CS639
Common formatting
These are lookup/formatting aliases for this reviewed condition, not separate pages.
- 31.35
What usually causes it
- The waste-toner bottle is missing or not seated where the printer expects it. This can stop printing even when the toner cartridges themselves are full and correctly installed.
- The exact condition recorded for this code is: The waste-toner bottle is not installed/seated correctly.
- Open only the normal supply-access area, remove the waste-toner bottle carefully, check that it is the correct bottle and not obstructed by packaging, then reinstall it fully without spilling collected toner.
What to try
Check the condition this code actually names
Remove and reinstall the waste-toner bottle, then retry.
Isolate the affected part of the workflow
Open only the normal supply-access area, remove the waste-toner bottle carefully, check that it is the correct bottle and not obstructed by packaging, then reinstall it fully without spilling collected toner.
Run a controlled confirmation test
Close the access door and allow the printer to re-detect the bottle before printing a one-page test. If the code clears, no toner-cartridge reset is needed.
After each corrective action
Retry the original operation that produced 31.35. If it works, stop there rather than moving into unrelated troubleshooting.
If the code returns
If 31.35 returns with a correctly installed bottle, note whether the bottle was recently replaced and whether another known-correct bottle is recognized.
When service may be needed
Do not defeat the bottle-detection mechanism or vacuum loose toner from internal electronics. Persistent detection failure needs supply replacement or service.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Official four-model User’s Guide (2026 edition) contains the printer error-code section and safety cautions.