In short
On a LG Signature dryer this is airflow far more often than a failed heater: a blocked filter or a restricted duct will leave a load damp at the end of a full cycle. The first two checks need no tools. A heating element or an igniter is further down the list.
Symptoms, including the misleading ones
- The load is damp and the drum is cool — No heat is being made at all, which is a different and shorter list.
- Cycles that used to take one run now take two or three — A restriction that has been building for months rather than a component that failed overnight.
- NEAR MISS — the drum does not turn at all — That is a belt, a motor or a door switch, and the page for a dryer that will not start covers it.
Causes, most likely first
- The vent duct and the outside hood — The duct is the part nobody sees. Flexible hose crushed behind the machine, a long run packed with lint, or an outside hood whose flap is stuck shut by lint or a bird's nest will stop the air leaving — and a dryer that cannot exhaust cannot dry. This is the one to start with: this machine is vented through whatever duct was already there, and a duct that has never been cleared is the likeliest restriction in the whole path. LG Signature is the built-in end of the LG range: the same platform lineage, but installed into cabinetry, which changes what can go wrong and what it takes to get at it.
- The lint filter and the path behind it — A filter that looks clean can still be blinded by a film of fabric softener, and lint that gets past it packs the housing below. Either way the air slows, the load stays wet and the machine runs hotter than it should. Next in order: it takes a minute and it either is the fault or it clears it from the list.
- The programme and the moisture sensor — An air-fluff or no-heat setting dries nothing by design. A moisture sensor coated in softener residue tells the machine the load is dry when it is not, and the cycle ends early with damp clothes and no fault code. After those two: it is worth eliminating with one timed cycle before anything is opened.
- The load and how it is dried — An overloaded drum has no room for air to move through it, and a load that went into the dryer soaking from a spin that failed will not dry in one cycle whatever the machine does. Mixing heavy and light items produces the same complaint. Fourth in order: it contributes rather than causes, but it costs nothing to eliminate.
What to check first, second, third
- Run the dryer and hold a hand at the outside hood — Strong warm air means the path is open; a weak trickle, or a flap that never lifts, means the restriction is in the duct.
- Pull the filter out and hold it under a running tap — Water that sits on the mesh instead of running straight through means the filter is blinded, even though it looks clean.
- Run a timed cycle on high heat instead of an automatic one — A load that dries properly on a timed cycle but not on an automatic one has named the sensor without any tools.
What an owner can safely check
- Disconnect and clear the duct, and check the hood flap opens — Pull the machine out, take the hose off, and clear it end to end. Replace crushed flexible hose rather than straightening it.
Tools: vacuum, duct brushAbout 45 min
- Wash the lint filter and vacuum the housing it sits in — Wash with warm water and a little detergent, dry it fully, and vacuum the slot below it before refitting.
Tools: vacuum, warm waterAbout 20 min
- STOP before removing a panel to reach the element, the igniter or a cutout — Live terminals, and on a gas machine a gas valve, sit behind it. Naming the likely cause is the useful end of an owner check.
The part that is not optional
Safety
Unplug the dryer or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. On a gas dryer: if you smell gas, do not switch anything on or off, leave the building, and call the gas utility or 911 from outside; do not look for the leak yourself. Never run a dryer with its vent disconnected into the room.
Where the owner's part ends
Call when the filter is clean, the duct is clear, the hood opens and the drum is still cool at the end of a cycle — at that point it is the element, the igniter or a cutout. Call at once for any smell of gas or burning.
Nearest pages of this class
What is deliberately not here
Generalized information. This page covers LG Signature dryers as a class rather than one family or model line; where a family-specific page exists it is the better answer and is linked above. Not covered here: element part numbers, gas-train procedures and figures that vary between families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
