The short answer
On an LG dryer, a cycle that will not finish most often comes down to a restricted exhaust duct. LG dryers sense dryness with moisture bars in the drum, and residue on those bars ends cycles early in a way that looks like a heat fault. The first check below needs no tools, and the list stops where a meter on live terminals begins.
What you observe
- The cycle ends after a few minutes with the load still wet — The machine believes the load is dry, which is a sensing statement rather than a heating one.
- The cycle runs far longer than the estimate — Either the load will not dry, or the machine cannot tell that it has.
- The time remaining jumps around — Normal on a sensor-dry cycle, which estimates and re-estimates as it goes.
- NEAR MISS — the drum does not turn at all — That is a no-start fault and a different page.
Causes, most likely first on a LG dryer
- Restricted exhaust duct — Ranked first here: moist air that cannot leave makes every cycle longer and eventually trips a protector.
- Dirty moisture sensor bars — Ranked second: this machine decides the load is dry from bars in the drum, and softener residue on them ends cycles minutes after they start.
- Overloaded or barely loaded drum — Last on this list: sensing needs the load to touch the sensor, and a packed drum blocks its own airflow.
Check in this order, and why
- Feel the outside vent hood during a cycle — Weak flow explains a long cycle on its own. First: likeliest cause, least effort.
- Compare a timed cycle against an automatic one — A good timed run and a bad automatic run isolates sensing. Second: it separates the next two causes.
- Rerun with a half load of similar fabrics — A normal cycle on a half load settles the question. Third: only once the checks above are clean.
What an owner can safely check
- Check flow at the outside hood and clear the first run of duct — Most restriction sits close to the machine.
Tools: vacuum, duct brushAbout 30 min
- Run a timed cycle and see whether the load dries normally — This separates sensing from heating in a single run.
Tools: noneAbout 40 min
- Wipe the metal bars inside the drum with a little white vinegar — Removes the softener film that makes wet loads read dry.
Tools: cloth, white vinegarAbout 10 min
- Dry a half load of one fabric type and compare — Mixed heavy and light items confuse sensing on any machine.
Tools: noneAbout 45 min
- STOP HERE if the next step needs a meter on live terminals — That is where an owner check ends and a service call begins.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off.
When to call a technician
Call once sensing and airflow are both clean and the cycle still misbehaves, because the next step is measurement on live terminals. Call immediately if the cabinet runs hot or you smell scorched lint.
Nearest pages of this class
What this page does not cover
This page covers LG dryers as a class, not one family or model line. It reasons from how LG builds this appliance — enough to rank the causes, not enough for wiring colours, torque figures or part numbers, which differ by family. Where a model-specific page exists it is linked here and is the better answer; this class page has no such child yet, so nothing is withheld by omission.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
