--- title: "LG d90 — a graded duct blockage reading on a new hookup" description: "What d90 means on LG d90 — a graded duct blockage reading on a new hookups, what to check before booking, and when it is not a failure at all." url: "https://applianceinstallation.center/error-codes/lg-d90/" --- # LG d90 — a graded duct blockage reading on a new hookup LG's own help library explains that d90 or d95 mean the dryer has detected a 90 or 95 percent blockage in the duct work, and specifically warns not to use the dryer until the exhaust system has been cleaned and repaired. ## What d90 actually means. LG's own help library explains that d90 or d95 mean the dryer has detected a 90 or 95 percent blockage in the duct work, and specifically warns not to use the dryer until the exhaust system has been cleaned and repaired. LG appliance display · also shown as d95, d80, d75 What to do when d90 shows on the appliance ### Kind of code Vents and ducting A restricted-exhaust message on one of the first loads means the new dryer is pushing against its duct. The cause is almost always the install: a run longer than the maker's table allows for its number of elbows, a transition duct crushed flat when the machine was pushed to the wall, a duct pulled off its collar, or a wall cap whose flap cannot open. Stop the cycle, unplug, and have the run shortened, straightened and reconnected before the next load. ### Usually leads to Laundry exhaust run installation A metal exhaust path from a new dryer to the outdoors: short transition, taped joints, a working hood. ### Shows up as Laundry Exhaust Crushed, Loose or Blowing Into the Room A laundry exhaust disconnected, crushed or venting into the room means a new vented dryer is blowing hot, damp, lint-heavy air behind the machine instead of outdoors. ### Make LG LG installs span refrigerators with water lines, stacked or side-by-side laundry, dishwashers and ranges, often with a Wi-Fi setup at first power-on. ### Source LG USA Support — Understanding d90 and d95 Error Codes LG documents a graded scale from d75 through d95 on the same dryer platform, with severity increasing toward d95. ## Before you book, in this order. Each step comes from LG's own guidance for d90 on its appliances. Follow it to the end: the last card says whether this is a visit. 01 Confirm the lint filter itself is clean before assuming the duct run is the cause. 02 Check for airflow at the outside vent while a cycle is running. 03 Disconnect and inspect the full duct run for obstructions, including anywhere it was crushed or kinked during installation. 04 Do not run the dryer again until the exhaust system is confirmed clear and repaired, per LG's own warning. ### Still there? It usually turns into [laundry exhaust run installation](https://applianceinstallation.center/services/laundry-exhaust-run-installation/). Book with the code and the model number. ### What not to do d90 does not mean the heating element or the drum motor has failed. LG's own explanation points entirely at the exhaust duct outside the cabinet, which is an installation and maintenance detail rather than a part inside the unit. ## What you may notice with it. The appliance problems d90 tends to arrive with. Answer these at the appliance before anyone is booked. [All problems](https://applianceinstallation.center/problems/) Before you call ### [Laundry Exhaust Crushed, Loose or Blowing Into the Room](https://applianceinstallation.center/problems/laundry-exhaust-disconnected/) [All 6 causes, cheapest first](https://applianceinstallation.center/problems/laundry-exhaust-disconnected/) It also comes with - [**Hood Not Drawing Smoke: Duct Size, Damper and Makeup Air**](https://applianceinstallation.center/problems/hood-not-drawing-smoke/) - [**Appliance Installation Code on a New Unit: Setup Modes and Hookup Messages**](https://applianceinstallation.center/problems/appliance-installation-code/) Hazard after a hookup ### Laundry Exhaust Crushed, Loose or Blowing Into the Room 6 causes, cheapest first Where d90 usually leads ## Laundry exhaust run installation. **Metal exhaust transition and reachable wall run fitted from a new dryer to the outside hood, joints taped, airflow confirmed · moderate.** Book a visit [What the job involves](https://applianceinstallation.center/services/laundry-exhaust-run-installation/) ## LG appliances. LG installs span refrigerators with water lines, stacked or side-by-side laundry, dishwashers and ranges, often with a Wi-Fi setup at first power-on. [LG appliance installation](https://applianceinstallation.center/brands/lg/) More LG codes [GAS](https://applianceinstallation.center/error-codes/lg-gas/) [E13](https://applianceinstallation.center/error-codes/lg-e13/) [Sb](https://applianceinstallation.center/error-codes/lg-sb-range/) [IE](https://applianceinstallation.center/error-codes/lg-ie/) [UE](https://applianceinstallation.center/error-codes/lg-ue/) [OE](https://applianceinstallation.center/error-codes/lg-oe/) [OFF](https://applianceinstallation.center/error-codes/lg-off-fridge/) Vents and ducting on other makes [Electrolux EF1](https://applianceinstallation.center/error-codes/electrolux-ef1-known-installation-issue/) [GE Profile Check Vent / Vent Blocked](https://applianceinstallation.center/error-codes/ge-profile-vent-blocked/) [Samsung C90](https://applianceinstallation.center/error-codes/samsung-c90/) LG builds this ### Cold storage Setting a new refrigerator, freezer, wine or beverage unit or ice maker into its opening: measured, connected to water, leveled and started. LG builds this ### Cooking appliances Hooking up ranges, cooktops, wall ovens, microwaves and hoods: gas connectors leak-tested, anti-tip brackets fastened, ducts sized and the first light checked. LG builds this ### Dish care Fitting a new dishwasher or dish drawer under the counter: supply line, drain loop or air gap, power, mounting brackets and a first test cycle. ## In LG's own words > If you see a d90 or d95 error on your control panel, your dryer has detected a 90% or 95% blockage in the duct work, prompting immediate attention. [LG USA Support — Understanding d90 and d95 Error Codes](https://www.lg.com/us/support/help-library/laundry-dryer-understanding-d90-and-d95-error-codes-CT10000011-20150209089448) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. LG documents a graded scale from d75 through d95 on the same dryer platform, with severity increasing toward d95. ## LG d90 appliance installation, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Confirm the lint filter itself is clean before assuming the duct run is the cause. If it comes back, it needs a visit. ### Can a brand-new duct run already read as 90 percent blocked? Yes, if the run is too long, has too many tight turns, or was crushed while the unit was pushed into place, a new hookup can show this reading on its very first cycle. ### Is it safe to keep drying loads while d90 is showing? No, LG's own warning is not to use the dryer until the exhaust system has been cleaned and repaired, since a heavily restricted duct affects both drying performance and heat buildup. ### How is d90 different from d75 or d80? They are all the same graded reading at different severities — LG's scale reports roughly 75, 80, or 90-95 percent blockage — so a lower number is still worth checking even though it is less urgent than d90 or d95. --- **[Read on the site: LG d90 — a graded duct blockage reading on a new hookup](https://applianceinstallation.center/error-codes/lg-d90/)** **[Book a visit with ApplianceInstallation.center](https://applianceinstallation.center/schedule/)**