Error Code C9
Your dryer vent is over 90% blocked — needs immediate cleaning
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: C9 or C90
What This Means
Severe lint buildup in vent ductwork; Severely crushed or kinked exhaust duct; Duct too long or has too many bends; Completely clogged lint filter or external hood
What actually causes this:
Severe lint buildup in the exhaust vent is almost completely blocking airflow. This is a fire hazard.
First Thing to Check
Stop using the dryer and check the exhaust vent immediately for heavy lint buildup.
Parts Involved
How to Fix
- 1
1. Clean the lint filter thoroughly
- 2
2. Disconnect and thoroughly clean the entire exhaust duct
- 3
3. Check for crushed, kinked, or compressed duct sections — replace if damaged
- 4
4. Ensure duct is 4-inch rigid metal and as short/straight as possible
- 5
5. Clean the external exhaust hood and ensure it opens and closes freely
- 6
6. Re-run the Vent Blockage Test to confirm resolution
Parts Commonly Needed for This Error
OEM part numbers confirmed by retailers
This Error Applies To
Samsung DV45A6400 Series Dryers (2024) (2024–present)
Related Error Codes
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A button on the control panel is stuck or shorted
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The door switch isn't working properly