What causes the D90 code on a LG dryer?

Clogged exhaust vent: Lint has built up in the duct from the dryer to the outside — the cause in almost every case. A clogged vent is a known fire hazard. Crushed or too-long vent run: A kinked foil duct or an over-long run restricts airflow. Gas-supply issue (gas models): On gas dryers, D80 can also indicate a lack of gas supply.

LG · Dryer Serious

D90 — LG Dryer D80 / D90 / D95 — Clogged Exhaust Vent

The D80, D90, and D95 codes report how blocked the exhaust duct is — roughly 80%, 90%, and 95% restricted. This is an airflow and fire-safety warning, not a malfunction.

Keep using it?: Limited use only
DIY difficulty: Easy
Verified against: lg.com ↗

How to fix it

Clean the lint screen every load.
Disconnect and clean the full exhaust duct from the dryer to the exterior vent hood with a vent-cleaning brush kit.
Replace crushed foil ducting with smooth rigid or semi-rigid duct and shorten the run if possible.
Confirm the exterior vent flap opens freely.

Why it happens

Typical signs: Long drying times · Dryer hot to the touch · D80, D90, or D95 on the display

Clogged exhaust vent Lint has built up in the duct from the dryer to the outside — the cause in almost every case. A clogged vent is a known fire hazard.
Crushed or too-long vent run A kinked foil duct or an over-long run restricts airflow.
Gas-supply issue (gas models) On gas dryers, D80 can also indicate a lack of gas supply.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Dryer Vent Cleaning Kit Common replacement
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More LG dryer codes

AE AE — Compressor / heat-pump system fault bE bE — Drum drive belt broken or off CL CL — Child Lock / Control Lock active d80 d80 / d90 / d95 — Exhaust Duct Blocked d95 d95 — Exhaust duct ~95% blocked dE dE Error — Door Open / Not Latched

All LG codes → All dryer codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.