LG Dryers error code
Severe exhaust airflow restriction
LG lists d90 in the same Flow Sense family as d80 and d95. Treat a returning d90 as an unresolved exhaust-path problem, not as a display fault that should be cleared repeatedly.
Also shown as: D90, Flow Sense d90
Direct answer
d90 at a glance
- Meaning
- Severe exhaust airflow restriction
- Urgency
- Pause and inspect
- First safe check
- Stop the cycle and allow the appliance and load to cool.
- Model note
- LG groups d90 with d80 and d95. The display does not identify the physical location of the restriction, so inspect the airflow path in order and follow the installation limits for the exact dryer.
Confirm the symptom
What usually appears with d90
- d90 appears and the cycle may stop or take unusually long
- The load remains damp while the dryer area feels excessively warm
- The outside exhaust flap opens weakly or not at all
- The warning returns soon after the display is reset
Likely causes
Why d90 appears
- 01Lint filter is blocked or coated
- 02Exhaust connector is crushed, kinked, or coiled
- 03Exterior outlet is blocked
- 04Concealed household vent is restricted or excessively complex
Observation-led diagnosis
Start with what you can actually see
An error code identifies a system, not a replacement part. Match the observable condition before deciding what to check next.
| What you observe | What it suggests | Safest next move |
|---|---|---|
| Air at the exterior outlet is weak during an Air Dry test | The exhaust path is still substantially restricted | Owner checkStop the test and inspect the visible connector and outlet before using heat again. |
| The connector is flattened behind the dryer | Moving the dryer into position has reduced the duct opening | Owner checkDisconnect power and correct the installation without stretching, puncturing, or sharply bending the connector. |
| The exterior outlet is clear but airflow remains weak | The concealed vent may contain lint or an installation restriction | Stop and serviceArrange a professional vent cleaning and ask for the vent length and number of 90-degree turns. |
| There is a hot or burning odor, smoke, or repeated thermal shutdown | Restricted airflow may be creating an active overheating hazard | Stop and serviceStop using the dryer, disconnect power if safe, and seek qualified help promptly. |
Safe diagnostic path
What to check, in order
- 01
Stop the cycle and allow the appliance and load to cool.
- 02
Clean and fully dry the lint filter.
- 03
Inspect the full visible connector behind the dryer for crushing, kinks, holes, loose joints, or spring-like coils.
- 04
Check the outside exhaust outlet and flap for visible lint or debris.
- 05
Do not resume normal heated drying if d90 returns; arrange professional cleaning of the concealed vent path.
Know when to stop
Don’t push past this point
Keep the dryer off and request qualified help for burning odor, unusual heat, shutdowns, a damaged duct, or any d90 warning that persists after accessible checks.
- Do not assume a clean lint filter proves the in-wall duct is clear.
- Do not keep drying smaller loads to work around a returning d90 warning.
- Do not enter roof, wall, or elevated vent locations without suitable professional access.
Primary source
How this page was checked
The code meaning and manufacturer-specific guidance were checked against the linked support material on August 31, 2026. Confirm details against the manual for your exact model before removing panels or parts.
Read LG USA: d80, d90, and d95 Flow Sense guidance ↗Common follow-up questions
About LG code d90
What does d90 mean on a LG dryers?
d90 means “Severe exhaust airflow restriction.” LG lists d90 in the same Flow Sense family as d80 and d95. Treat a returning d90 as an unresolved exhaust-path problem, not as a display fault that should be cleared repeatedly.
Can I clear d90 by resetting the appliance?
Do not use a reset as the first or only response to d90. The useful confirmation is restored airflow after the filter, connector, outlet, and concealed vent have been evaluated.
Does d90 mean the same thing on every LG model?
LG groups d90 with d80 and d95. The display does not identify the physical location of the restriction, so inspect the airflow path in order and follow the installation limits for the exact dryer.
When should I stop troubleshooting d90?
Keep the dryer off and request qualified help for burning odor, unusual heat, shutdowns, a damaged duct, or any d90 warning that persists after accessible checks.