ErrorCodeDoctor
LG Dryer d90 error code
The d90 code means your LG dryer detected that the exhaust airflow is approximately 90% blocked. This is an urgent warning — at 90% restriction the dryer is working extremely hard to expel hot air, which significantly increases drying times, raises the risk of overheating, and poses a potential fire hazard. Do not ignore this code. Clean the lint trap and exhaust hose immediately and if the code does not clear contact a professional duct cleaner as soon as possible.
Common causes
- Lint trap is heavily clogged reducing airflow significantly
- Exhaust hose behind the dryer is severely kinked, crushed, or coiled
- Outside exhaust vent flappers are heavily blocked and cannot open
- Significant lint buildup inside the wall ducts restricting most of the airflow
How to fix it
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1
Stop using the dryer until the blockage is cleared to reduce fire hazard risk
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2
Remove and clean the lint trap thoroughly — wash with warm water and a soft brush then let it dry
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3
Check the exhaust hose behind the dryer and straighten any kinks, dents, or coils immediately
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4
Inspect the outside exhaust vent and clear any visible lint blocking the flappers
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5
Run the Air Dry cycle and confirm the outside flappers open fully
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6
If d90 persists after all checks contact a professional duct cleaner urgently to clear the wall ducts
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7
Ask the duct cleaner for the total vent length and number of 90 degree bends to determine if modifications are needed
Related LG Dryer error codes
d75
The exhaust airflow is 75% restricted — the vent system needs cleaning
d80
The exhaust airflow is 80% restricted — the vent system needs cleaning or inspection
d95
The exhaust airflow is 95% restricted — stop using the dryer immediately
nP
No electrical current detected at the heater — likely a home wiring issue