LG Dryer Error Code D80
Duct blockage detected — exhaust duct 80% blocked
LG's Flow Sense sensor has detected that your dryer's exhaust duct is approximately 80% blocked. Airflow is significantly reduced, causing longer dry times, overheating risk, and potential fire hazard. This is the single most-searched LG dryer error code with nearly 10,000 searches per month.
What Does Error Code D80 Mean on a LG Dryer?
Duct blockage detected — exhaust duct 80% blocked.
LG's Flow Sense sensor has detected that your dryer's exhaust duct is approximately 80% blocked. Airflow is significantly reduced, causing longer dry times, overheating risk, and potential fire hazard. This is the single most-searched LG dryer error code with nearly 10,000 searches per month.
What Causes Error Code D80?
Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:
- 1 Lint buildup in exhaust duct over time 55% of cases
- 2 Kinked or crushed flexible duct behind dryer 25% of cases
- 3 Exterior vent cap clogged or flap stuck closed 10% of cases
- 4 Duct run too long or too many 90° bends 10% of cases
How to Fix LG Dryer Error Code D80
- 1
Clean the lint filter
Remove the lint filter (inside the door) and clean thoroughly. This should be done after every cycle.
- 2
Disconnect and clean the exhaust duct
Pull the dryer from the wall and disconnect the duct from the back. Use a dryer vent brush kit to clean the full length of the duct from both ends.
🔩 Dryer vent brush kit ($15–$35) - 3
Check the exterior vent
Go outside and locate the exhaust vent. Remove any lint buildup, bird nests, or debris. Ensure the flap opens freely.
- 4
Replace flexible duct with rigid metal
Flexible foil or plastic ducts crush easily and trap lint in their ridges. Replace with smooth rigid metal duct for runs over 3 feet.
🔩 4-inch rigid metal duct ($15–$40 per section) - 5
Recheck duct routing
Maximum recommended duct run: 25 feet with no more than two 90° elbows. Reduce run length if possible.
How to Reset Error Code D80
After clearing the duct, run an Air Only (no heat) cycle for 20 minutes. The D80 code will clear once the Flow Sense sensor detects adequate airflow. If it doesn't clear after a full cycle, blockage remains.
Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.
When to Call a Professional
If the duct is completely clean and the code persists, the Flow Sense sensor itself may have failed. Professional diagnosis needed.
Related Error Codes
Find Replacement Parts
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