Samsung Dryer Cg — What It Means & How to Fix It
Also shown as Clg, C80, C8, C90, C9, C8o, C9o on some models.
Cg (and the C80 and C90 variants) is the result of Samsung's Vent Blockage self-test telling you the exhaust duct is clogged — the number roughly indicates how restricted it is — so the fix is to clean the lint filter and the entire vent line.
What this code means
Unlike fault codes that interrupt a cycle, these appear only after you deliberately run the Vent Blockage test. Cg or Clg means the duct is blocked, C8 or C80 indicates roughly 80% restricted, and C9 or C90 over 90%. The test measures how freely the dryer can push air out, so a high reading is a direct call to clear the exhaust path.
These are test results, not cycle faults — you'll only see them after running the Vent Blockage test, which not every Samsung model offers. Two related results can appear too: C1 or CL1 means laundry was left in the drum during the test, and Ct means the room is too cold or too hot to test. Clear those conditions and run it again.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Lint-packed exhaust duct or wall vent | Very common | Yes — no tools |
| Clogged or blocked outdoor vent flap | Common | Yes — no tools |
| Crushed or kinked flexible transition hose | Common | Yes — no tools |
| Excessively long or convoluted duct run trapping lint | Occasional | Partly — may need reroute |
What you can try yourself
- Unplug the dryer, remove and clean the lint filter, then pull the transition hose off the back to check it for packed lint or crushing.
- Clear the wall duct as far as you can reach, and confirm the outdoor vent flap opens freely and isn't blocked by lint, debris, or a bird's nest.
- Reconnect everything with the dryer a few inches off the wall so the hose isn't pinched.
- Re-run the Vent Blockage test with an empty drum; a clear duct should now report "0" or "End" instead of a Cg, C80 or C90 reading.
- If the reading stays high after a thorough cleaning, the duct run may be too long or convoluted and worth having a vent-cleaning pro power-clean or reroute.
When to call a technician
- The blockage reading stays high even after you've cleaned everything you can reach.
- Drying times are very long and clothes come out damp despite a cleaned filter.
- The duct run is long, buried in walls, or you can't safely reach the outdoor vent.
Typical professional repair cost: Professional dryer-vent cleaning typically runs $100–$200; rerouting or replacing an inaccessible duct costs more depending on the run.
Frequently asked questions
What does C80 or C90 mean on a Samsung dryer?
They're Vent Blockage test results: C80 (or C8) means the exhaust is roughly 80% blocked and C90 (or C9) over 90%. Both mean your vent needs cleaning — start at the lint filter and work all the way out to the outdoor flap, then re-run the test to confirm it reads clear.
How do I run the Vent Blockage test on a Samsung dryer?
Empty the drum and close the door. Press Power, and within a few seconds press and hold the buttons your manual specifies (often a combination such as Adjust Time Up plus Dry Level) until a test prompt appears, then press Start. It runs about two minutes and reports the blockage level. Not all models include this test.
Why does my Samsung dryer keep failing the vent test after cleaning?
If it still reads Cg or a high percentage, either the duct wasn't fully cleared — check the outdoor flap and any hidden sections — or the run is simply too long or twisty for good airflow. A vent-cleaning service can power-clean deep runs or advise on a shorter, straighter route.
Related Samsung codes
- Samsung Dryer dC Your Samsung dryer shows dC when it can't confirm the door is shut and latched, so the drum won't turn — usually a door caught on laundry, a misaligned strike, or a tired latch switch rather than anything deep inside the machine.
- Samsung Dryer HC HC is Samsung's overheating warning: the dryer sensed the drum getting hotter than it should and cut the heat to stay safe — nine times out of ten because a clogged lint filter or blocked exhaust vent is trapping heat inside.
- Samsung Dryer tS tS on a Samsung dryer flags a problem with the temperature reading itself — the sensor is reporting a value the control doesn't trust — and the most common trigger is a clogged lint filter or vent throwing readings off rather than a dead part.
- Samsung Dryer 9C1 9C1 tells you the Samsung dryer is seeing abnormal electrical supply — too high, too low, or unstable — most often from an extension cord, a shared or miswired outlet, or a power cord that isn't fully seated.
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