Quick diagnosis
What this code is telling you
Most likely trigger
severely clogged exhaust duct
Recommended replacement
Dryer Vent / Transition Duct
Diagnostic path
4 ordered checks
Part fit
Exact model number required
Safety first
Before opening the appliance
Do not continue normal dryer use with a severe vent restriction. Restricted exhaust airflow can create a fire hazard.
Read the full safety disclaimerRoot cause
Why the control reported this error
C90 indicates that the dryer vent-blockage test detected a severe restriction of more than roughly 90 percent because severely clogged exhaust duct. blocked exterior termination and crushed or disconnected duct can produce the same code, so verify the fault before replacing components.
Symptoms
What you may notice
- ✓Very long dry times
- ✓Dryer overheats
- ✓C90 appears after vent test
Possible causes
Check the most likely causes first
- 1
severely clogged exhaust duct
Start here when it matches your symptoms.
- 2
blocked exterior termination
- 3
crushed or disconnected duct
Diagnostic sequence
Work through these checks in order
Stop when you find the fault. Do not perform a step that requires skills or live testing you are not qualified to do.
- 1
Check 1
Stop normal dryer use until airflow is restored.
- 2
Check 2
Clean the lint screen and the complete exhaust duct.
- 3
Check 3
Inspect the exterior vent hood and transition duct for blockage or crushing.
- 4
Check 4
Repeat the vent test only after the full exhaust path is clear.
Recommended next step
Troubleshoot before buying a part
This code does not point to a replacement part as the first action.
Follow the diagnostic sequence above first. Supply problems, maintenance conditions, settings, airflow restrictions, or temporary control states can often trigger this code without a failed component.
If the code returns after the listed checks, use the complete model number and manufacturer documentation before ordering anything.
Common questions
Quick answers for this fault
What should I check first for C90?
Start with severely clogged exhaust duct. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Do I need to buy a part for C90?
Usually not as the first step. This code is commonly tied to a setting, supply issue, maintenance condition, airflow restriction, or temporary operating state. Complete the diagnostic checks before considering parts.
When should I stop troubleshooting C90 myself?
Stop if the next step requires live electrical testing, sealed-system work, gas or combustion service, or any procedure outside your training. Do not continue normal dryer use with a severe vent restriction. Restricted exhaust airflow can create a fire hazard.
Manufacturer reference
Verify against the official support source
FixCodeDB summarizes the fault in plain language. For model-specific instructions, confirm the guidance with the manufacturer and your appliance manual.
Samsung Dryer Error Codes — Samsung Support →Was this useful?
Did these checks help with your Samsung C90 error?
Keep diagnosing
Related Samsung guides
Samsung identifies 3C as a dryer motor error.
These Samsung dryer codes indicate that the control is detecting abnormal incoming supply voltage.
The dryer control cannot communicate correctly with one or more internal electronic components.
The dryer has detected a control-panel button that appears to be stuck or continuously pressed.
Different problem?
Search another code or symptom
Go back to the main diagnostic search and try the code, symptom, appliance, component, or brand.
Open diagnostic search →