ErrorCodeDoctor
LG · Dryer

LG Dryer d90 error code

Difficulty: Medium · Cost: $0–$150 · Duration: 20–30m

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

  1. 1

    Stop using the dryer until the blockage is cleared to reduce fire hazard risk

  2. 2

    Remove and clean the lint trap thoroughly — wash with warm water and a soft brush then let it dry

  3. 3

    Check the exhaust hose behind the dryer and straighten any kinks, dents, or coils immediately

  4. 4

    Inspect the outside exhaust vent and clear any visible lint blocking the flappers

  5. 5

    Run the Air Dry cycle and confirm the outside flappers open fully

  6. 6

    If d90 persists after all checks contact a professional duct cleaner urgently to clear the wall ducts

  7. 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

1

d75

The exhaust airflow is 75% restricted — the vent system needs cleaning

easy
2

d80

The exhaust airflow is 80% restricted — the vent system needs cleaning or inspection

medium
3

d95

The exhaust airflow is 95% restricted — stop using the dryer immediately

hard
4

nP

No electrical current detected at the heater — likely a home wiring issue

medium

d90 error — frequently asked questions

What does the d90 error mean on a LG dryer?

The exhaust airflow is 90% restricted — urgent cleaning required

What causes the d90 error?

The d90 error is usually caused by: 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.

Can I fix the d90 error myself?

It's possible for a moderately handy person, but budget 20–30m and expect some disassembly.

How much does it cost to fix the d90 error?

Fixing the d90 error on a LG dryer typically costs $0–$150, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my dryer with the d90 error?

In most cases yes, but it's best to address the d90 error soon — see the fix steps below to resolve it.