The D80 error means airflow restriction — exhaust duct is 80–95% blocked, causing overheating risk. It may also appear as D90 / D95 on some models.
The LG dryer displays the D80 error and halts the current cycle until the underlying problem is fixed.
Check these in order. The first cause accounts for the majority of D80 errors.
The primary cause in nearly all cases. Lint accumulates in the duct run over years of use. LG's FlowSense sensor detects the restriction and displays the percentage blocked — D80=80%, D90=90%, D95=95%.
The flexible foil duct behind the dryer is easily crushed when the machine is pushed against the wall. Even a partial crush restricts airflow enough to trigger D80.
Bird nests, debris, or a stuck vent flap at the exterior wall can block the exhaust outlet entirely. Check outside the house.
LG specifies a maximum equivalent duct length. Each 90-degree elbow adds 5 feet of equivalent length. Excessive duct runs restrict flow even when clean.
Follow these in order. Stop as soon as the error clears.
Pull the dryer away from the wall and disconnect the duct hose from the back.
Use a flexible dryer vent brush kit (available at hardware stores for $15–25). Work the brush from the dryer end, feeding it through the entire duct to the exterior vent. Remove accumulated lint.
Inspect the flexible duct section behind the dryer. If it's crushed, kinked, or made of plastic accordion foil, replace it with rigid or semi-rigid metal duct. Plastic foil duct is a fire hazard and shouldn't be used with dryers.
Go outside and inspect the vent cap. The flap should open freely when you blow into it. Clear any bird nest material, lint blockage, or stuck flap.
Reconnect the dryer, restore power, and run a timed dry cycle for 20 minutes. The D80/D90/D95 code should not reappear if the duct is clear. If it does, there may be a hidden blockage mid-duct requiring professional duct cleaning.
For warranty service, contact LG support ↗ or a certified appliance technician.