What causes LG Dryer D90?

Lint packed in the lint filter, the filter housing, or along the vent duct. Exhaust hose behind the dryer crushed, dented or kinked, often after the dryer was pushed back or moved. Flexible hose coiled like a spring, sagging, torn, or loose at a joint. Outside vent hood flaps stuck shut with lint, or blocked by a cover, cage, nest or debris (in a new house the end cap is sometimes still closed). A duct run that's too long or has too many 90-degree elbows. An overstuffed load that keeps air from moving from the back of the drum to the front. Rarely, a weak or failing blower fan, if the warning stays after the vent has been fully cleaned or replaced.

How do I fix LG Dryer D90?

Stop drying loads until the vent is cleared. Unplug the dryer, and on a gas dryer shut off the gas valve before pulling it out. Clean the lint filter. If it's coated, wash it with warm water and a soft brush and let it dry fully before reinstalling it. Disconnect the exhaust hose and check that it isn't crushed, kinked, torn or coiled. A gentle S-curve is fine. Brush or vacuum lint out of the hose, the dryer's exhaust outlet, and as much of the wall duct as you can reach. A drill-powered dryer vent brush helps on longer runs. Go outside to the vent hood. Clear lint, nests and debris, and make sure the flaps can open all the way. Replace foil or plastic hose with rigid or semi-rigid metal duct, and keep the run short and straight. Your owner's manual lists the maximum duct length for your model and number of elbows. Reconnect everything, run a timed or Air Dry cycle with the drum empty, and feel for strong airflow at the outside vent. Run a few normal cycles. Flow Sense needs several consecutive cycles to register the better airflow before the warning goes away.

When should I call a pro for LG Dryer D90?

The vent runs inside walls, an attic or a roof and you can't clean all of it. LG recommends a dryer vent cleaning specialist and suggests asking them for the total duct length and number of 90-degree bends. The duct is too long or has too many turns and needs rerouting. The warning keeps coming back after the vent has been cleaned or replaced. LG Canada says the blower fan may be defective and to contact LG service. You smell burning or the dryer is very hot to the touch. Stop using it until it has been inspected. You have a gas dryer and suspect a gas supply problem. Gas work should be done by a qualified technician.

Code: D90🌀 LG Dryer

LG Dryer Error Code D90: Vent About 90% Blocked (Meaning, Causes, Fixes)

Q: What does LG Dryer D90 mean?

d90 on an LG dryer is a Flow Sense warning that the exhaust vent is roughly 90% restricted. It's a step past d80 and close to the most severe level (d95), so stop using the dryer and clear the lint filter, hose and vent before running it again. It's almost always a venting problem, not a broken dryer. LG's Flow Sense system checks how well hot, humid air leaves the dryer. LG USA says d75, d80, d90 and d95 mean the exhaust duct is about 75%, 80%, 90% or 95% clogged, and that two or four lit bars on the Flow Sense indicator mean the exhaust is severely restricted. LG Canada calls these codes safety alerts rather than dryer malfunctions: poor venting makes the dryer run hot, and LG warns that reduced airflow is a fire risk if ignored. LG's owner's manual says not to use the dryer while it shows d90 or d95 until the exhaust system is cleaned or repaired. Signs that usually come with it are long drying times, clothes needing more than one cycle, and the dryer feeling hotter than normal; a burning smell means stop right away.

Reviewed 2026-10-22 · Based on 4 manufacturer & service sources

What the code means

LG's Flow Sense system checks how well hot, humid air leaves the dryer. LG USA says d75, d80, d90 and d95 mean the exhaust duct is about 75%, 80%, 90% or 95% clogged, and that two or four lit bars on the Flow Sense indicator mean the exhaust is severely restricted. LG Canada calls these codes safety alerts rather than dryer malfunctions: poor venting makes the dryer run hot, and LG warns that reduced airflow is a fire risk if ignored. LG's owner's manual says not to use the dryer while it shows d90 or d95 until the exhaust system is cleaned or repaired. Signs that usually come with it are long drying times, clothes needing more than one cycle, and the dryer feeling hotter than normal; a burning smell means stop right away.

Likely causes

Lint packed in the lint filter, the filter housing, or along the vent duct
Exhaust hose behind the dryer crushed, dented or kinked, often after the dryer was pushed back or moved
Flexible hose coiled like a spring, sagging, torn, or loose at a joint
Outside vent hood flaps stuck shut with lint, or blocked by a cover, cage, nest or debris (in a new house the end cap is sometimes still closed)
A duct run that's too long or has too many 90-degree elbows
An overstuffed load that keeps air from moving from the back of the drum to the front
Rarely, a weak or failing blower fan, if the warning stays after the vent has been fully cleaned or replaced

Safe DIY checks

⚠ Before you start

Unplug the appliance or switch off its breaker before opening panels.

Stop drying loads until the vent is cleared. Unplug the dryer, and on a gas dryer shut off the gas valve before pulling it out.
Clean the lint filter. If it's coated, wash it with warm water and a soft brush and let it dry fully before reinstalling it.
Disconnect the exhaust hose and check that it isn't crushed, kinked, torn or coiled. A gentle S-curve is fine.
Brush or vacuum lint out of the hose, the dryer's exhaust outlet, and as much of the wall duct as you can reach. A drill-powered dryer vent brush helps on longer runs.
Go outside to the vent hood. Clear lint, nests and debris, and make sure the flaps can open all the way.
Replace foil or plastic hose with rigid or semi-rigid metal duct, and keep the run short and straight. Your owner's manual lists the maximum duct length for your model and number of elbows.
Reconnect everything, run a timed or Air Dry cycle with the drum empty, and feel for strong airflow at the outside vent.
Run a few normal cycles. Flow Sense needs several consecutive cycles to register the better airflow before the warning goes away.

🛠 When to call a pro

The vent runs inside walls, an attic or a roof and you can't clean all of it. LG recommends a dryer vent cleaning specialist and suggests asking them for the total duct length and number of 90-degree bends.
The duct is too long or has too many turns and needs rerouting.
The warning keeps coming back after the vent has been cleaned or replaced. LG Canada says the blower fan may be defective and to contact LG service.
You smell burning or the dryer is very hot to the touch. Stop using it until it has been inspected.
You have a gas dryer and suspect a gas supply problem. Gas work should be done by a qualified technician.

Parts that commonly fix it

Always match the part number to your exact model.

⚙

Dryer vent cleaning brush kit

Flexible rods with a brush that attach to a drill, for cleaning long duct runs from inside or outside.

[affiliate link slot: AFFILIATE_SLOT_VENT_BRUSH]

⚙

4-inch rigid or semi-rigid metal dryer duct

Replaces crushed foil or vinyl hose. Metal duct holds its shape and traps less lint.

[affiliate link slot: AFFILIATE_SLOT_DRYER_DUCT]

⚙

Exterior dryer vent hood

Replace one with broken or sticking flaps. Avoid screened hoods, which catch lint.

[affiliate link slot: AFFILIATE_SLOT_VENT_HOOD]

⚙

Replacement lint filter

Only if yours is torn or warped. Match the part number to your dryer's model number.

[affiliate link slot: AFFILIATE_SLOT_LINT_FILTER]

Sources

Last reviewed 2026-10-22. Always confirm against the manual for your exact model number.

LG Dryer Error Code D90: Vent About 90% Blocked (Meaning, Causes, Fixes)

What the code means

Likely causes

Safe DIY checks

🛠 When to call a pro

Parts that commonly fix it

Dryer vent cleaning brush kit

4-inch rigid or semi-rigid metal dryer duct

Exterior dryer vent hood

Replacement lint filter

Related codes

Sources