LG Dryer d80 Error Code: What It Means and How to Fix It

Last updated: October 5, 2026 · Codes covered: d80, d90, d95, d75 · Sources

A d80 code on an LG dryer means the dryer's Flow Sense system has found that air isn't getting out through the exhaust vent the way it should. It's usually a venting problem, not a broken dryer, and most people can clear it by cleaning the lint filter, the duct, and the outside vent hood. If the code keeps coming back after a full cleaning, the problem is likely inside the walls or inside the dryer and needs a pro.

The same warning can show up as d90 or d95 (a worse blockage), and LG's support pages also list d75 on some models. The fix is the same for all of them.

What the d80 code means

LG says d75, d80, d90 and d95 mean the exhaust duct is about 75%, 80%, 90% or 95% blocked. Somewhere between the back of the dryer and the vent on the outside of your house, airflow is restricted.

LG treats the higher numbers as more urgent. For d90 and d95, LG says the blockage needs "immediate attention." Its owner's manual adds a clear warning for all three codes: don't use the dryer until the exhaust system has been cleaned or repaired, because a severely restricted vent is dangerous and could cause a fire. (Another part of the manual says the dryer can still run with d80, just with longer drying times. To be safe, fix it before the next load.)

Some models show four bars on a Flow Sense indicator instead of a code. LG says this means the same thing: the exhaust is badly restricted.

What's normal: LG's owner's manual says the code or bars can stay on the display for about two hours after the cycle ends. Opening the door or pressing Power turns the display off.

Gas dryer owners: LG notes that on gas models, d80 may also point to a lack of gas reaching the dryer. If your gas dryer isn't heating, check that the gas shutoff valve is fully open.

Likely causes (most common first)

1. Lint buildup in the duct. The duct behind the dryer and the run through the wall slowly fill with lint. This is the most common cause.
2. A dirty lint filter. A clogged or residue-coated screen cuts airflow before air even reaches the duct.
3. A crushed, kinked or coiled duct. Pushing the dryer back against the wall can flatten the duct. LG says the duct shouldn't be coiled "circle over circle like a spring."
4. A blocked outside vent hood. Flaps can jam with lint. Screens or cages can also clog, and snow or debris can block the opening.
5. Holes or loose joints in the duct, which let air escape before it gets outside.
6. A duct run that's too long or has too many bends. LG says long runs with multiple elbows can cause blockages that are hard to find.
7. An overloaded drum, which LG says restricts airflow.
8. A sensor or dryer fault. This is rare. It's only likely if the code keeps coming back with a clean, short, straight vent.

How to fix it, step by step

Try a normal cycle after each step.

1. Clean the lint filter. Remove the lint. Then wash the screen with warm water and a soft brush, as LG recommends, to remove fabric-softener film. Let it dry completely before you put it back.
2. Check airflow outside. Start the Air Dry cycle and go to the vent hood outside. You should feel strong airflow and see the flaps open fully. Weak or no airflow means there's a restriction.
3. Clear the vent hood. Remove lint from around the hood and make sure nothing is blocking it. LG says to replace the exhaust cover if its flaps can't open.
4. Unplug the dryer and pull it out. Unplug it first. On a gas dryer, move it carefully so you don't strain the gas line.
5. Inspect the duct behind the dryer. It shouldn't be crushed, dented, kinked, compressed or coiled. LG says it should run straight or in a gentle S-curve. Check for holes and loose joints.
6. Disconnect and clean the duct. Take the duct off the back of the dryer and remove any lint or obstructions. Clean the dryer's exhaust outlet as well.
7. Use the right duct. LG recommends rigid or semi-rigid metal duct. Replace a damaged duct rather than taping it.
8. Reconnect and test. Push the dryer back gently without crushing the duct, plug it in, and run a smaller load.
9. Run LG's exhaust check, if your model has one. Some LG owner's manuals describe an installation test. You start it with an empty, cool drum, and it runs for about two minutes while it measures drum temperatures. Four bars at the end mean the exhaust is severely restricted. The button combination varies by model, so look it up in your owner's manual.
10. Call a vent cleaning service if the code persists. LG says the duct inside your walls may need professional cleaning. Ask them to check for lint, the total vent length, and the number of 90-degree bends.

Test the part

The vent is almost always the problem with d80, so do these checks only after the vent is clean and the code still returns. You'll need a basic multimeter.

1. Unplug the dryer. Pull the plug from the wall, or switch off its breaker if you can't reach the plug. On gas models, don't disconnect the gas line.
2. Check the blower area for lint. With the dryer unplugged and the lint filter out, look into the filter housing with a flashlight. Lint packed below the filter or around the blower housing restricts airflow just like a clogged duct.
3. Check the thermistor (temperature sensor). LG's owner's manual says the exhaust check works by measuring drum temperatures. Disconnect the sensor's wiring connector and set your meter to resistance (ohms). A healthy thermistor shows a resistance reading right away, and the reading drops as the sensor warms up. No reading, or a reading that doesn't change with temperature, means it has failed. Readings vary by model, so check the tech sheet or wiring diagram for yours. LG says a thermistor problem usually shows a tE code.
4. Check the thermal fuse or high-limit thermostat for continuity. A blocked vent is a common reason these overheat-protection parts trip, and the dryer then stops heating. Which parts your dryer has varies by model. Disconnect the wires, set the meter to its lowest ohms or continuity setting, and touch one probe to each terminal. A good part reads near zero (continuity). No continuity means it has blown or opened. A blown thermal fuse can't be reset. Fix the vent before you replace it, or the new one may trip again.
5. Stop and call a pro if you'd need to take the cabinet apart to reach a part, if it's a gas dryer and anything near the burner is involved, or if the parts test fine and the code continues.

Never test with the dryer plugged in. Leave live-voltage checks to a technician.

Safety notes

When to call a pro

Call a dryer vent cleaning service if:

• The code returns after you've cleaned the filter, the duct behind the dryer, and the outside hood.
• Your vent is long, runs through an attic or roof, or has several bends.

Call LG service or an appliance technician if:

• The vent has been professionally cleaned and checks out, but the code persists. LG says service is then needed for a proper diagnosis.
• The dryer has stopped heating, smells hot or burning, or it's a gas model with a gas issue.
• Your dryer is under warranty. Check the terms before opening it yourself.

You can reach LG support through lg.com/us/support or at 1-800-243-0000.

FAQ

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