Duct blockage warning — exhaust airflow 80 percent restricted by lint
The d80 error on the LG DLEX3700V indicates duct blockage warning — exhaust airflow 80 percent restricted by lint. This typically occurs due to lint accumulation inside the exhaust duct over time. Most homeowners fix this in 30–60 min by following the steps below.
Common Causes of d80
- 1Lint accumulation inside the exhaust duct over time
- 2Duct length too long with multiple bends reducing airflow
- 3Bird nest or debris blocking the exterior vent cap
- 4Crushed or kinked flexible duct behind the dryer
How to Fix d80
- 1
Step 1
Unplug the dryer from the electrical outlet
- 2
Step 2
Clean the lint screen thoroughly — remove it from the slot inside the door and clear all lint before every cycle
- 3
Step 3
Pull the dryer away from the wall and disconnect the flexible duct from the back
- 4
Step 4
Use a dryer vent cleaning brush kit or a vacuum with a long attachment to remove lint from inside the duct
- 5
Step 5
Go outside and clean the exterior vent cap — remove any lint, debris, or obstruction blocking the flaps
- 6
Step 6
Reconnect the duct, push the dryer back, plug it in, and run a timed dry cycle to confirm airflow is restored
Tools Needed
When to Call a Technician
Error persists after thorough duct cleaning — the duct may need professional re-routing due to excessive length or too many bends
Frequently Asked Questions
Common questions about LG d80 error
The d80 code on the LG DLEX3700V is a FlowSense warning indicating the exhaust duct is approximately 80 percent blocked. This does not stop the dryer from running but signals that a duct cleaning is needed soon. Ignoring it will eventually trigger the d90 and d95 warnings, which can lead to overheating and a potential fire hazard.
LG recommends cleaning the dryer exhaust duct at least once a year. If you run the dryer daily or dry heavy items like towels and blankets frequently, clean the duct every six months. Cleaning the lint screen before every single cycle is also essential to maintaining proper airflow.
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