The short answer
On a LG dryer, a dryer that tries to start and fails usually comes down to the drive motor rather than anything deeper in the machine: a motor with a failing start winding hums without turning, and one with a worn bearing hums steadily whatever the load. That keeps it an owner check first, not a service call. Start here: clear the whole vent run to the outside first, because LG's control reacts to duct restriction and will shorten or stall cycles rather than overheat.
What you are seeing
- No sound at all when start is pressed
- A hum from the machine with no drum movement
- A drum that turns freely by hand with no resistance
- Not this fault: A machine that runs but does not heat, which is a heating fault
- Not this fault: A cycle that starts and ends early, which is a cycle fault
- Body: LG builds this dryer as a drum carried on rollers with felt seals front and rear, a dual blower path, moisture bars in the drum front and a duct-restriction indicator. That architecture decides which of these you see first.
- Also check note: If these fit better, the fault is a different one.
Likely causes, in order
- The drive motor — Why this rank: The LG drive is board-commanded, so a hum with no rotation is judged at the board rather than at the winding.
- A worn door switch — Why this rank: The LG door catch has to report closed before the drive is commanded, so a door that needs a push is a machine that does nothing.
- A tripped belt-break switch — Why this rank: LG fits a belt-break arrangement on some models, so a snapped belt reads as a completely dead machine.
- Half the supply missing or no supply at all — Why this rank: An LG that lights its panel but will not run may still have lost one leg of a two-pole supply.
- A tired start switch — Why this rank: The start contact has to make properly for a moment.
- Body: Ranked for a LG dryer specifically.
What to check, in order
- Body: The order follows the ranking, and the ranking follows the platform. First: note whether the drum can be turned by hand freely while the motor hums. It goes first because the LG drive is board-commanded, so a hum with no rotation is judged at the board rather than at the winding. Second: press the plunger with the door open and listen for a firm click. With the first check clean, this is what the LG platform makes next most likely. Third: reach in and turn the drum by hand; a drum that spins with no resistance suggests a broken belt. Only after those three is it worth reaching for half the supply missing or no supply at all: it costs more to get at, and it does not explain the first three coming back clean.
Checks you can make
- Disconnect the duct at the wall and run the dryer on air-fluff. A strong steady flow at the machine with weak flow at the outside hood puts the restriction in the run, not in the dryer. — Tools: screwdriver — Time: about fifteen minutes
- Press the door switch plunger with the door open and listen for a firm click, then hold the door hard against the frame while pressing start. — Tools: none — Time: about five minutes
- Pull the lint filter and wipe the two metal sensor bars behind it with a little rubbing alcohol on a cloth. A softener film there is the usual cause of a cycle that stops early. — Tools: cloth, rubbing alcohol — Time: about five minutes
- Press and hold the start button for a moment rather than tapping it. On many machines the start contact has to make properly, and a tired contact needs a deliberate press. — Tools: none — Time: about five minutes
- Body: Stop at the first step that would need a meter on live terminals or a sealed assembly opened.
Before you open anything
Safety
Switch the machine off at its breaker or unplug it before opening anything, and shut the water supply if the fault involves water. Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. These machines are heavy and move when they are worked on. Get help before tilting or walking one out, and never put a hand under a raised cabinet. Water and a heavy electrical appliance share the same floor in a laundry room. Dry it before you kneel on it.
When to call
The line is not difficulty, it is what the next step costs and risks. Call when: the supply and the door switch are both proven and the machine still does nothing
What this page omits
This is generalized information: it ranks causes for the LG dryer range as one platform, not for a single model. Where a page exists for your specific model it is the more specific one and takes precedence over this. The narrower pages below cover the other presentations of this symptom.
Entries: - [LG Dryer: Abnormal Noise or Vibration](/blog/lg-dryer-abnormal-noise) - [LG Dryer: Not Heating](/blog/lg-dryer-heating-failure) - [LG Dryer: Water Leak](/blog/lg-dryer-water-leak)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
