Error Code C9/C90
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 accumulation in the duct system; Fully blocked exhaust duct or hood; Crushed or severely kinked exhaust duct
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 exhaust duct
- 3
3. Check outside exhaust hood for blockage
- 4
4. Replace damaged duct sections if needed
- 5
5. Re-run vent blockage test after cleaning
This Error Applies To
Samsung DV25B6900E Series Dryers (2024) (2024–present)
Related Error Codes
Your dryer is getting the wrong type of electrical power
The dryer's internal parts aren't communicating properly
Your dryer is getting the wrong voltage from the outlet
Your dryer isn't heating properly or is overheating
Your dryer's temperature sensor isn't reading correctly
A secondary temperature sensor is giving bad readings
The door switch isn't working properly
Your dryer vent is about 80% blocked