Quick diagnosis
What this code is telling you
Most likely trigger
lint buildup in exhaust duct
Recommended replacement
Dryer Vent / Exhaust Duct
Diagnostic path
4 ordered checks
Part fit
Exact model number required
Safety first
Before opening the appliance
Do not continue normal dryer use with a severe exhaust restriction. Lint buildup in dryer venting can create a fire hazard.
Read the full safety disclaimerRoot cause
Why the control reported this error
d90 means the dryer has detected an exhaust restriction of about 90 percent through its Flow Sense monitoring because lint buildup in exhaust duct. crushed or kinked transition duct and blocked exterior vent hood can produce the same code, so verify the fault before replacing components.
Symptoms
What you may notice
- ✓Drying takes much longer than normal
- ✓Dryer becomes unusually hot
- ✓d90 appears on the display
Possible causes
Check the most likely causes first
- 1
lint buildup in exhaust duct
Start here when it matches your symptoms.
- 2
crushed or kinked transition duct
- 3
blocked exterior vent hood
Diagnostic sequence
Work through these checks in order
Stop when you find the fault. Do not perform a step that requires skills or live testing you are not qualified to do.
- 1
Check 1
Clean the lint filter.
- 2
Check 2
Inspect and clean the complete exhaust duct to the exterior.
- 3
Check 3
Correct crushed or kinked transition ducting.
- 4
Check 4
Run the dryer only after airflow has been restored.
Recommended next step
Troubleshoot before buying a part
This code does not point to a replacement part as the first action.
Follow the diagnostic sequence above first. Supply problems, maintenance conditions, settings, airflow restrictions, or temporary control states can often trigger this code without a failed component.
If the code returns after the listed checks, use the complete model number and manufacturer documentation before ordering anything.
Common questions
Quick answers for this fault
What should I check first for d90?
Start with lint buildup in exhaust duct. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Do I need to buy a part for d90?
Usually not as the first step. This code is commonly tied to a setting, supply issue, maintenance condition, airflow restriction, or temporary operating state. Complete the diagnostic checks before considering parts.
When should I stop troubleshooting d90 myself?
Stop if the next step requires live electrical testing, sealed-system work, gas or combustion service, or any procedure outside your training. Do not continue normal dryer use with a severe exhaust restriction. Lint buildup in dryer venting can create a fire hazard.
Manufacturer reference
Verify against the official support source
FixCodeDB summarizes the fault in plain language. For model-specific instructions, confirm the guidance with the manufacturer and your appliance manual.
LG Dryer d90/d95 Flow Sense Codes — LG Support →Was this useful?
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Related LG guides
d80, d90, or d95 indicates 80%, 90%, or 95% airflow restriction in the home exhaust vent system.
d95 means the dryer has detected an extremely severe exhaust restriction of about 95 percent through Flow Sense monitoring.
AE or E1 means water has reached the dishwasher base area and activated the leak/float sensing system.
LG identifies bE as a bubble error, often caused by using hand dishwashing liquid or another detergent that creates excessive suds.
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