How an LG dryer signals trouble
An LG dryer watches its exhaust airflow, its heat and its motor through sensors and a control board, so a problem shows up as a code on the display. Some of those codes are genuine faults; others, the Flow Sense duct-restriction prompts, are information that the exhaust needs cleaning rather than a broken part. Reading the code is the start of any LG dryer repair, and the codes cover vented DLEX and DLGX dryers as well as the ventless heat-pump DLHC models.
Flow Sense duct-restriction prompts
The Flow Sense numbers track roughly the percentage of exhaust blockage. d80 is about 80% restricted, d90 cools the drum and stops, and d95 stops immediately because airflow is almost gone. These are not part failures — the fix is to clean the lint filter and the full exhaust duct to the exterior, confirm the exterior flap opens, and use rigid metal transition duct rather than foil. A blocked vent also makes a dryer take far too long, the subject of its own guide.
Heat, motor and supply codes
Thermistor faults read as tE1 (inlet/heater), tE2 (cold-weather backflow, often self-clearing), tE3 (outlet) and tE4 (temperature out of range). On ventless heat-pump dryers, AE is a compressor fault, LE1 the drum motor, and LE3 the blower. nP means no current at the heater — often a missing 240V leg — and PS flags improper cord voltage or wiring. F0/FO means the lint filter is out.
What to check, and when to call
For a Flow Sense prompt, clean the lint filter and the entire vent run before anything else. A tE thermistor fault, a heat-pump AE or LE code, an nP no-heat condition or a PS wiring fault needs an experienced technician with genuine parts. See the d90/d95 vent-blockage guide and the not-heating guide, browse the full list in the error codes library, then book dryer repair. Confirm your model on the manufacturer’s site at lg.com/us.