LG Dryer Error Code d80 — 80% Exhaust Restriction
What this means
The d80 error code means the LG dryer's Flow Sense system has detected that the exhaust vent is approximately 80% restricted. This is a serious blockage that significantly reduces drying performance, increases energy use, and poses a fire hazard. Lint buildup in the vent duct is the most common cause.
Step-by-step fix
4 stepsClean the lint filter
Remove the lint filter from the dryer and clear all accumulated lint. Wash the filter with warm soapy water if it has fabric softener residue (hold it up to light — if you can't see through the mesh, it needs washing). Let it dry completely before reinstalling.
A clogged lint filter alone can cause d80 errors. Clean it before and after every load.
Disconnect and clean the vent duct
Pull the dryer away from the wall. Disconnect the vent duct from the back of the dryer. Use a dryer vent cleaning brush kit (long flexible brush) to clean lint from the entire length of the duct, working from both ends. Vacuum up loosened lint.
Rigid or semi-rigid metal duct is recommended. Replace any crushed flexible foil or vinyl ducts, which trap lint easily.
Check the exterior vent hood
Go outside and locate the vent hood where the duct exits the building. Ensure the damper flap opens freely and is not blocked by lint, debris, or a bird's nest. Clean the opening thoroughly.
If the damper flap is stuck closed, dryer exhaust has nowhere to go — this alone can cause d80.
Verify the duct length and routing
LG dryers recommend a maximum vent duct run of 35 feet for 4-inch rigid duct, with deductions for each elbow (subtract 5 feet per 90-degree turn). If your duct is too long or has too many turns, consider rerouting or installing a dryer vent booster fan.
Each 90-degree elbow in the vent run is equivalent to adding 5 feet of straight duct.
When to call a professional
If you cannot access the full length of the vent duct (especially through walls or ceilings), hire a professional dryer vent cleaning service. They have specialized tools to clean long runs. Annual professional cleaning is recommended.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Dryer Vent Cleaning Brush Kit (12-foot)
Part #Universal · $15–$30
Needed for cleaning the vent duct
Rigid Aluminum Vent Duct (4-inch)
Part #Universal 8ft · $10–$20
If replacing flexible or vinyl duct
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