LG Dryer D80 Error Code: Meaning, Causes & Fix
Flow Sense: exhaust airflow is about 80% blocked — vent restriction warning (80% level of the D80/D90/D95 family).
LG's Flow Sense system measures the dryer's exhaust restriction. D80 means roughly 80% blocked: the dryer still runs, but drying times stretch, energy use climbs, and lint-heat builds where it shouldn't. D80 is the early warning of the family — D90 and D95 are its louder siblings, and D95 stops the dryer. All three are vent-system codes, not dryer-part codes: the house vent run is the patient.
What causes the D80 code on a LG dryer?
Lint build-up in the vent run
The leading cause — especially long runs, runs with many elbows, and foil-flex hose that traps lint in its ridges.
Crushed or kinked transition hose
The short hose between dryer and wall gets crushed when the dryer is pushed back.
Blocked exterior vent hood
Lint mats, bird nests, snow, or a stuck flapper at the outside termination.
Lint filter housing/screen restriction inside the dryer
A filter that looks clean can carry an invisible fabric-softener film; the duct below it packs with lint over years.
Vent run too long or with too many elbows for LG's limits
LG dryer manuals cap a 4-inch rigid metal run at 65 ft (19.8 m) with no elbows, falling to 28 ft (8.5 m) with four 90-degree elbows, say to deduct 6 ft (1.8 m) for each additional elbow, and say not to use more than four 90-degree elbows. LG's support guide adds that long runs and runs with multiple elbows or transition ducts create hard-to-trace blockages and long drying times.
Wrong duct material, or screws poking into the duct
LG manuals require 4-inch (10.2 cm) rigid or semi-rigid metal ductwork, forbid plastic or thin foil ducting, limit flexible metal duct to 8 ft (2.4 m) total, and warn not to use sheet metal screws or other fasteners that extend into the duct, where they catch lint and reduce exhaust efficiency - joints should be secured with duct tape instead.
Low or interrupted gas supply on a gas dryer
LG's dryer error-code list notes that on gas dryers a d80 display can indicate a lack of gas supplied to the unit, not just a blocked vent. Treat this as an external supply check only - do not open gas connections yourself; have the supply checked by a qualified installer or your gas supplier.
Checks to run before you replace anything
- Water test the lint filter: run water through it — if water pools instead of passing, softener film is choking it (scrub with hot soapy water and a brush).
- Check airflow at the outside hood while the dryer runs: weak, lazy flow confirms restriction.
- Inspect the transition hose for crushing and replace foil-flex with smooth or semi-rigid metal duct if present.
- Run the manual's Installation Test (Duct Check) with the dryer cool and empty: if the dryer was warmed up, run Air Dry for a few minutes first, load nothing in the drum, and start the test with the button sequence printed in your model's manual - no bars (or the Flow Sense LED staying off) means the exhaust is adequate, while four bars (or the LED on) means it is severely restricted.
- Audit the run against LG's duct chart: confirm the duct is 4 inches (10.2 cm) in diameter throughout, count the 90-degree elbows (four maximum), check the total length against the chart for that elbow count, and confirm any flexible metal section is 8 ft (2.4 m) or less with joints taped, not screwed into the airflow.
- If the dryer was recently pushed back, moved, or just installed, re-check the two spots LG's Flow Sense guide flags: the duct may have been broken or kinked during the move, and on a new installation the outside wall vent cap is sometimes still closed or covered - run the dryer and confirm air is actually exhausting outside.
How to fix flow sense on lg dryer vent?
- Clean the entire vent run properly (rotary brush kit or a vent-cleaning service) — from the dryer to the outside hood, not just the ends.
- Replace crushed/foil hose with smooth-wall or semi-rigid metal duct; keep the run as short and straight as the space allows.
- Clean the dryer's internal duct and filter housing area (unplug first).
- Re-run Flow Sense's test (per your manual's button sequence) or a normal load to confirm the code has dropped/cleared.
The part that usually fails: None in the dryer — the vent system
Flow Sense codes are cured with duct cleaning, not parts. Only if a verified-clear vent still reads blocked should the dryer's airflow sensor (thermistor set) be suspected — a technician diagnosis.
Explain the lg dryer d80 error code by detailing flow sensor resets
D80 clears when airflow measures back in range — after vent cleaning, run a cycle (or the Flow Sense check in the manual); no special reset exists, because the code is a measurement, not a latch.
LG dryer codes clear with a power cycle: unplug for about 5 minutes, hold the Power button for a few seconds while unplugged on some models, restore power and run a test load. Flow Sense bars and codes like D80 are computed fresh from airflow measurements each cycle, so they only 'reset' by fixing the airflow — a power cycle alone cannot clear a genuine restriction.
Lg dryer keeps giving error code d80
If D80 returns within weeks of a thorough vent clean, lint is accumulating abnormally fast — check for a torn lint filter letting lint bypass into the duct, and confirm the exterior hood isn't re-blocking (nests/snow are seasonal repeat offenders).
How to stop D80 coming back
- Lint build-up in the vent run: The leading cause — especially long runs, runs with many elbows, and foil-flex hose that traps lint in its ridges.
- Crushed or kinked transition hose: The short hose between dryer and wall gets crushed when the dryer is pushed back.
- Blocked exterior vent hood: Lint mats, bird nests, snow, or a stuck flapper at the outside termination.
Retrieving stored fault codes on LG dryers
LG dryers have an installation/test mode (used at install to verify venting and, on gas models, the gas connection) and a service test mode that steps through motor, heater, steam and sensor checks while showing stored codes (the tE family and others). The entry sequence is model-specific and printed in the service manual; running the install test after any vent work is the fastest way to confirm a Flow Sense fix.
Other LG dryer error codes
| Code | Meaning | First fix |
|---|---|---|
| ADD | Add water notice; the steam feeder needs water for a steam cycle. | Fill the steam feeder with tap water to the max line; close the drawer. |
| AE | Compressor error on heat-pump WashTower dryers; shown with LE2 (fold 'AE'). | Unplug, wait one minute, reconnect and retry; request service if it persists. |
| CL | Child Lock is ON — not an error (panel locked). | Hold the Child Lock button (or the marked pair) ~3 seconds until CL clears — the pairing is printed on the panel. |
| D90 | Flow Sense: exhaust about 90% blocked — serious vent restriction (mid-level of the D80/D90/D95 family). | Full vent-run cleaning (brush kit or service), hood to dryer. |
| D95 | Flow Sense: exhaust about 95% blocked — the dryer stops for safety (top of the D80/D90/D95 family). | Clean the full vent run with a rotary brush; clear/repair the hood; replace crushed or foil hose with metal duct. |
| E13 | Drain error on hybrid condensing dryers; sump water cannot drain. | Straighten and clear the drain hose, use only the standard hose, restart. |
| FO | Filter notice (display F0); the lint filter is out of its housing. | Remove the lint filter and reinsert it fully into the filter housing. |
| H5 | Humidity sensor error — the dryer's moisture (humidity) sensor is faulty or its signal is implausible. | Clean the strips (above) — always the first step. |
| HS | Humidity sensor error; the humidity sensor is faulty. | Wipe the sensors with a damp rag, let them dry fully, then retry. |
| IF | Filter installation notice on WashTower dryers; the lint filter is not detected (fold 'IF'). | Assemble both filter parts correctly and check the magnet is in place. |
| LE1 | Motor error variant on LG dryers — LE-family motor fault (locked/abnormal motor operation) as rendered on certain dryer platforms. | Open the cabinet (unplug) and service belt/idler/rollers; clear obstructions. |
| LE2 | Compressor error on heat-pump WashTower dryers; problem with the drying compressor (fold 'LE2'). | Unplug, wait one minute, reconnect and retry; request service if it persists. |
| LE3 | Air circulation motor error on WashTower dryers. | Unplug, wait one minute, reconnect and retry; request service if it persists. |
| NP | No Power / power-supply issue — the dryer (typically a gas model or electric model) reports an electrical power problem at the control. | Restore a verified supply (electrician for outlet/terminal faults — dryer circuits are high-current). |
See the full list on the LG Dryer error codes hub.
Codes D80 gets confused with
D90 — Flow Sense: exhaust about 90% blocked — serious vent restriction (mid-level of the D80/D90/D95 family). D90 means LG's Flow Sense measures the exhaust at roughly 90% restricted.
D95 — Flow Sense: exhaust about 95% blocked — the dryer stops for safety (top of the D80/D90/D95 family). D95 is the Flow Sense end-state: the exhaust is effectively blocked (~95%), so the LG dryer cuts heat/cycle to protect itself and your house.
Frequently asked questions
What does Flow Sense mean on an LG dryer?
Flow Sense is LG's exhaust-airflow monitoring. It reports how blocked the vent is (D80/D90/D95 ≈ 80/90/95%) so you clean the vent before it becomes a heat problem.
My vent was cleaned last year — why D80 already?
Long runs, many elbows, foil-flex hose and high-lint loads re-block vents fast. Also check the filter's water test — a filmed-over filter mimics a blocked vent.
What do the Flow Sense bars mean next to a d80 code?
LG says two or four bars on the Flow Sense indicator mean the exhaust system is severely restricted, and its manuals read the Duct Check the same way: no bars at the end of the test means the exhaust is adequate, four bars means it is severely restricted and should be checked immediately.
Why does d80 still show after the vent was cleaned or replaced?
LG's Flow Sense guide says that if the warning still appears after the venting duct has been cleaned and replaced, the dryer blower fan may be defective, and directs you to LG Customer Service. LG manuals also note the bar count in the installation test can differ from the count during normal operation, which gives the more accurate reading.
Can a brand-new dryer show d80 on its first loads?
Yes. LG highly recommends having the house exhaust duct cleaned before a new dryer is installed, because the new dryer is built to detect blockage the old one tolerated, and in a new house the wall vent end cap is sometimes closed or clogged - LG has you run the dryer and check that air exhausts outside.
How to fix flow sense on lg dryer vent?
Start here: Clean the entire vent run properly (rotary brush kit or a vent-cleaning service) — from the dryer to the outside hood, not just the ends. Replace crushed/foil hose with smooth-wall or semi-rigid metal duct; keep the run as short and straight as the space allows.
How to fix lg dryer error code d80?
Start here: Clean the entire vent run properly (rotary brush kit or a vent-cleaning service) — from the dryer to the outside hood, not just the ends. Replace crushed/foil hose with smooth-wall or semi-rigid metal duct; keep the run as short and straight as the space allows.
What does error code d80 mean on lg dryer?
Flow Sense: exhaust airflow is about 80% blocked — vent restriction warning (80% level of the D80/D90/D95 family). LG's Flow Sense system measures the dryer's exhaust restriction.
What does flow sense mean on lg dryer vent?
Flow Sense: exhaust airflow is about 80% blocked — vent restriction warning (80% level of the D80/D90/D95 family). LG's Flow Sense system measures the dryer's exhaust restriction.
What is lg dryer error code d80?
Flow Sense: exhaust airflow is about 80% blocked — vent restriction warning (80% level of the D80/D90/D95 family). LG's Flow Sense system measures the dryer's exhaust restriction.
Related guides
Facts on this page were checked against manufacturer documentation: www.lg.com · www.lg.com · www.lg.com