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 exhaust duct; Completely blocked or crushed exhaust duct; Outside exhaust hood sealed or 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. Clean the lint filter thoroughly
- 2
2. Disconnect and clean the entire exhaust vent system
- 3
3. Inspect the full duct run for blockages
- 4
4. Verify outside exhaust hood opens freely
- 5
5. Consider replacing ductwork if severely restricted
- 6
6. Rerun the Smart Install vent blockage test
This Error Applies To
Samsung DV55CG7 Series Dryers
Related Error Codes
Your dryer's temperature sensor isn't reading correctly
A secondary temperature sensor is giving bad readings
The door switch isn't working properly
The dryer thinks the door is open while running
Your dryer is getting the wrong type of electrical power
The dryer's internal parts aren't communicating properly
Your dryer vent is about 80% blocked
Your dryer is getting the wrong voltage from the outlet