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LG Dryer d90 Error Code
Exhaust vent 90% to 95%+ blocked
Applies to: All models with FlowSense duct blockage sensor. May also appear as d95.
What's going on
The d90 code on an LG dryer means the exhaust vent is almost completely blocked, so hot, damp air cannot get out. The dryer stops to protect itself, because trapped heat and lint can start a fire. Stop using the dryer, unplug it, and have the venting and dryer inspected and cleaned by a qualified professional before using it again.
LG dryers with the FlowSense duct blockage sensor watch how well air flows out through the exhaust vent. When airflow drops far enough, the dryer shows a warning code. d90 is one of the most serious levels and means the vent is nearly fully blocked. This code applies to LG models with FlowSense. Codes can differ between model generations, so confirm the meaning with your model number and owner's manual.
A dryer needs open airflow to push out heat, moisture, and lint. When the vent is clogged, heat builds up inside the dryer and the duct. Lint is very flammable, so a blocked vent is a real fire risk. That is why this code should be treated as urgent, not as a minor drying problem.
Likely causes
- exhaust vent duct — Lint builds up inside the duct over time, or the duct gets crushed, kinked, or pinched behind the dryer. Any of these can choke off airflow and trigger the code.
- exterior vent damper — The flap where the vent exits the house can get stuck closed or packed with lint. Debris or a nest can also block it, so air cannot escape.
- blower wheel — The blower wheel is the fan that pushes air out of the dryer. If it is clogged with lint or damaged, it cannot move enough air, and the sensor reads it as a blockage.
The same code can mean different things on different model generations. Check the model number on your dryer's rating plate before ordering parts.
Can you fix it yourself?
Usually a straightforward DIY fix.
When to call a technician
Stop using the dryer as soon as you see d90 and keep it unplugged. Call a qualified appliance technician or dryer vent cleaning professional to inspect and clear the full vent path and the dryer before it is used again.
What the repair usually costs
This is not a quote. Prices vary by region and by model.
Repair or replace?
Repair usually makes sense. Even the high end of this repair stays under $500, about half the price of a typical new dryer.
A typical new dryer costs about $800–$1,200.
Common questions
- What does d90 mean on a LG dryer?
- d90 means: Exhaust vent 90% to 95%+ blocked. The most likely parts involved are exhaust vent duct, exterior vent damper, blower wheel.
- Is it safe to keep using the dryer?
- This code can mean the appliance is overheating. Turn it off at the circuit breaker (or unplug it if you can do so safely) and call a qualified technician. Do not try to diagnose or repair this yourself.
- How much does it cost to fix d90?
- A typical overheating / vent blockage repair costs about $100–$250 nationally, parts and labor included. This is a reference range, not a quote — local prices vary.
- Should I repair or replace my dryer?
- Repair usually makes sense. Even the high end of this repair stays under $500, about half the price of a typical new dryer.
- Can I fix d90 myself?
- Usually a straightforward DIY fix.
- I cleaned the lint filter. Why does d90 still show?
- The lint filter only catches lint inside the dryer. The d90 code points to a blockage farther along the airflow path, such as the vent duct, the outside vent flap, or the blower. Those areas need a professional inspection and cleaning.
- Is d90 more serious than other LG vent codes?
- Yes. LG's FlowSense system shows different codes as the blockage gets worse, and d90 means the vent is close to fully blocked. It is a strong sign of a fire risk, so the dryer should stay off until the problem is fixed.