RRepairGraph
LG · Dryer · D90

Possible causes

The dryer detected an exhaust restriction of about 90 percent.

Diagnostic nodeD90CAUSES
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Use this as a diagnostic branchConfirm the exact model manual before ordering parts or opening the appliance.

Coverage: LG dryers equipped with the Flow Sense duct-blockage system.

GUIDANCE

Possible causes for error D90

Published guidance and the observed behavior point to these possibilities: Heavy lint buildup in the home duct; Crushed flexible duct; Blocked exterior vent hood. Check accessible conditions before considering a component fault.

Safe sequence

  1. 1Stop and unplug the dryer.
  2. 2Clean the lint filter and inspect only accessible duct sections.
  3. 3Use a professional vent-cleaning service for the home exhaust system.

Stop and get qualified help when

  • The dryer or vent is unusually hot
  • D90 returns after professional vent cleaning
Primary sourceLG USA — d90/d95 dryer errors ↗Verified 2026-07-17 · manufacturer