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
Exhaust duct severely obstructed with lint or debris; Exhaust duct crushed or kinked; Outside exhaust hood damper fully stuck closed
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. Run the Vent Blockage Test via Smart Install (Time + Start/Pause for 7 seconds)
- 2
2. Thoroughly inspect and clean or replace the entire exhaust duct run
- 3
3. Check for crushed or kinked ductwork
- 4
4. Ensure the outside exhaust hood damper opens freely
- 5
5. Retest after cleaning
This Error Applies To
Samsung DV50B5100 Series Dryers (2024) (2024–present)
Related Error Codes
The door switch isn't working properly
Your dryer isn't heating properly or is overheating
The dryer thinks the door is open while running
The dryer's internal parts aren't communicating properly
Your dryer detected restricted airflow during a vent test
Your dryer's temperature sensor isn't reading correctly
Your dryer is getting the wrong voltage from the outlet
Your dryer is getting the wrong type of electrical power