LG Dryer Not Heating · Diagnostic Guide · Same Day Southern California
LG Dryer Runs but Won't Heat? Check the Vent and the Fuse
Most LG no-heat calls trace to a clogged vent and a blown thermal fuse — and that vent is a fire risk. Here's what to check, where the d80 Flow Sense warning fits, and when it's the element or thermistor.
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01 · The short answer
An LG that won't heat is usually a choked vent and a blown fuse.
When an LG dryer tumbles but won't heat, start with the exhaust vent. A clogged vent makes the dryer overheat and blows its thermal fuse — the single most common LG no-heat part. After that come the heating element and the thermistor. On a gas LG, it's a weak igniter, gas-valve coils, or the flame sensor. If instead you're seeing a d80, d90, or d95, that's LG's Flow Sense airflow warning (covered on its own guide) — same root cause, a restricted vent. Clean the filter and full vent first: it fixes most no-heat calls and removes a genuine fire hazard. Still cold on a clear vent? It's a diagnostic. $89 residential diagnostic, waived with repair.
Why the vent comes first — and fast: the lint-clogged vent that stops your LG from heating is a leading cause of house fires. The U.S. Fire Administration counts about 15,600 dryer fires a year, and the NFPA finds failure to clean the dryer and its venting is the number-one factor. A dryer running hot or showing a Flow Sense warning is worth clearing the same day.
02 · Why an LG dryer stops heating
The causes, in the order our techs find them.
Restricted vent → blown thermal fuse (most common)
A lint-clogged filter or duct chokes the airflow, the dryer overheats, and LG's thermal fuse — a one-time safety device that doesn't reset — blows and cuts the heat. It's the number-one LG no-heat part, and it only stays fixed once the vent that blew it is cleared.
Heating element (electric models)
The element heats the air on an electric LG. When it burns open, the dryer tumbles with no heat. Tested for continuity and replaced inside the cabinet — a tech job.
Thermistor (temperature sensor)
The thermistor reports the air temperature to the control; a failing one can cut heat or, on some models, show a tE-type sensor code. It's tested against spec and replaced.
Flow Sense d80 / d90 / d95 — airflow, not a heat part
These are airflow-restriction warnings, not heating failures: at d95 the dryer cools and effectively stops. They point back to the vent. We keep the full walkthrough on the LG d80/d90/d95 guide rather than repeating it here.
Gas models — igniter, valve coils, flame sensor
On a gas LG, no-heat usually means the burner isn't lighting: a weak igniter, failed gas-valve solenoid coils, or a bad flame sensor. The tell is an igniter that glows then goes out without the gas lighting. Gas parts are a tech job — never DIY the gas valve.
03 · What you can safely check
Clear the vent, reset the breaker.
- Clean the lint filter and the full vent. Wash the filter, clear the flexible hose behind the dryer, and confirm the exterior flap opens. This fixes most no-heat and Flow Sense calls — and removes the fire hazard.
- Reset both breaker legs (electric). Flip the 240V double breaker fully off and on. A single tripped leg tumbles without heat.
- Confirm gas supply (gas). Verify the gas is on and other gas appliances work. Don't touch the gas valve or line.
- Power-cycle a stuck warning. After cleaning the vent, unplug for a minute and restart to clear a lingering Flow Sense code.
- Watch whether it returns. Heat restored after a vent cleaning = it was airflow. Still cold on a clear vent = a failed part.
Where to stop: vent cleaning and the breaker check are safe and fix a large share of LG no-heat calls. Do not open the cabinet to test the thermal fuse, heating element, or thermistor, and never disturb the gas line or valve on a gas dryer. A no-heat that survives a full vent cleaning is the handoff point.
04 · When it's a tech job
Clean vent, still cold? Time for a diagnostic.
When the vent is verified clear and the LG still won't heat, the fault is inside: an open thermal fuse (plus the vent that blew it), a burned-out heating element, a failing thermistor, or on gas the igniter, valve coils, or flame sensor. Our techs verify the vent first, then test the heating circuit and replace only the failed part. These are among the more affordable dryer repairs, so a no-heat LG is usually well worth fixing. $89 residential diagnostic, waived with the repair.
More help: the general dryer not heating guide (all brands), the dryer error codes reference, and the dedicated LG d80/d90/d95 Flow Sense guide. If your LG takes multiple cycles rather than none, that's dryer takes too long — usually the same vent. A chronically clogged vent deserves a dedicated dryer vent cleaning. Brand coverage: LG dryer repair. Same-day across Los Angeles, Beverly Hills, and Pasadena in most cases. Book online or call (424) 325-0520.
05 · FAQ
LG dryer not heating: common questions.
Why is my LG dryer not heating?
On an LG dryer that tumbles but won't heat, the first thing to rule out is a restricted exhaust vent — a clogged vent makes the dryer overheat and blows its thermal fuse, which is the single most common LG no-heat part. After the vent and fuse, the usual failed parts are the heating element and the thermistor (temperature sensor). On a gas LG, a weak igniter, a gas-valve coil, or a bad flame sensor stops the burner from lighting. If your LG is showing a d80, d90, or d95 warning instead, that's the Flow Sense airflow system telling you the vent is restricted — clean it and the code clears (see our dedicated LG d80/d90/d95 guide).
My LG dryer shows d80/d90/d95 — is that why it's not heating?
Those aren't heating faults, they're LG's Flow Sense airflow warnings — d80 means roughly 80% vent blockage, rising to d90 and d95, at which point the dryer cools down and effectively stops drying to protect itself. So yes, a badly restricted vent behind a d95 will leave your clothes cold. The fix is cleaning the filter and the full exhaust vent, and the code clears on its own. We keep the full walkthrough on a separate page — see the LG d80/d90/d95 guide linked below — so this page focuses on the no-heat causes that aren't airflow.
Can I fix an LG dryer that won't heat myself?
The safe, high-value step is yours: clean the lint filter and clear the entire exhaust vent, including the hose behind the dryer and the exterior flap. That resolves most no-heat and Flow Sense calls and removes a real fire hazard. Also reset both halves of the 240V breaker on an electric LG — if one leg trips, the drum tumbles but the heat is dead. What you should not do is open the cabinet to test the thermal fuse, heating element, or thermistor, and never touch the gas line or gas valve on a gas LG. Those are tech jobs.
Is a dryer that won't heat a fire hazard?
The clogged vent that most often stops an LG from heating is also a leading fire cause. The U.S. Fire Administration reports roughly 15,600 dryer fires a year, and the NFPA finds failure to clean the dryer and its venting is the number-one factor, with lint the most common material to ignite. That's why an LG running hot, throwing a Flow Sense warning, or refusing to heat is worth clearing the same day — it fixes the heat and removes the hazard together.
Is it worth repairing an LG dryer that won't heat?
Usually yes. The LG no-heat parts — thermal fuse, heating element, thermistor on an electric model, or igniter, gas-valve coils, and flame sensor on a gas model — are among the more affordable dryer repairs. Our techs verify the vent first (a fuse that blew from a blocked vent will just blow again if you don't clear it), then test the heating circuit and replace the failed part. $89 residential diagnostic, waived with the repair.
LG dryer still cold after cleaning the vent? Call today.
$89 diagnostic waived with repair. Same-day across LA, OC, Ventura. Phones answered 24/7.