Error Code d90

Duct blockage — ductwork approximately 90% blocked (displayed for 2 hours only)

Also displayed as: d90

How to Fix

1. 1

   Do not operate the dryer until the exhaust system has been cleaned and/or repaired — severely restricted exhaust is a fire hazard.

2. 2

   Check the outside dryer vent hood while dryer is operating for strong airflow; if airflow is weak, ductwork is blocked.

3. 3

   Inspect the vent hood exterior for lint buildup, damage, or obstruction; clean or replace as needed.

4. 4

   Check the entire duct run for kinks, tears, or clogs; straighten kinked duct or replace torn duct.

5. 5

   Do not install a screen on the end of the air duct.

6. 6

   Check total duct length — for 4-inch rigid metal duct with no elbows maximum is 65 ft; each 90° elbow reduces maximum length (1 elbow = 55 ft, 2 = 47 ft, 3 = 36 ft, 4 = 28 ft).

7. 7

   Use only 4-inch (10.2 cm) rigid, semi-rigid, or flexible metal ductwork.

8. 8

   Clean the lint filter before each load.

9. 9

   Clean the blower assembly if foreign material has entered.

10. 10

    If ductwork is confirmed clear but error recurs, press and hold Steam + Energy Saver for 3 seconds to default off Duct Blockage monitoring (display shows ON/OFF); or reset / replace main PCB.

11. 11

    Run installation check test after repair: press and hold Damp Signal and Wrinkle Care, then press Power; press Start/Pause; confirm code {n5 displays and test completes without d90/d95.

This Error Applies To

LG DLE8400BE Series Dryers (2023) (2023–present)