LG Dryer Not Heating: Thermal Fuse, Element & Sensor Checks
Quick answer
An LG dryer that tumbles without heat almost always has a blown thermal fuse — a one-time safety device on the exhaust duct that opens when the dryer overheats. Test with a multimeter: no continuity means it has failed. Replace the fuse AND clean the entire dryer vent duct; skipping the vent cleaning means the new fuse will blow again quickly.
LG electric and gas dryers are among the most common laundry appliances in Northern Virginia homes, particularly in Fairfax County, McLean, and the Herndon-Reston corridor. When an LG dryer tumbles normally but produces no heat — or heats for a few minutes then stops — the cause is almost always in one of four places: the thermal fuse, the heating element (electric models) or gas igniter, the thermostats, or the moisture sensor bars inside the drum. LG's Inverter Direct Drive motor means the drum mechanism is separate from the heating circuit, so a running drum with no heat is a strong sign the fault is in the heating system, not the motor.
Step 1 — Thermal Fuse (Most Common Cause)
The thermal fuse is the first component to check on any LG dryer with no heat. On LG models it is mounted on the exhaust duct inside the rear cabinet — a small oval or oblong white plastic component with two wire terminals. Its only job is to open permanently if the dryer exhaust temperature exceeds a safe threshold (caused by a clogged vent duct, a failed cycling thermostat, or restricted airflow). Once the fuse opens, the heating circuit is dead: the dryer tumbles normally but produces zero heat. To test: unplug the dryer, remove the rear panel (typically six to eight screws on LG models), locate the thermal fuse on the exhaust duct, and test across its terminals with a multimeter on continuity mode. No beep or OL reading means the fuse has failed. LG thermal fuses are $8–$18 online. Critical: before installing the new fuse, clean the entire dryer vent duct from the dryer outlet to the exterior cap — a clogged duct is the cause of almost every LG thermal fuse failure, and the new fuse will blow again within weeks if the restriction remains.
Step 2 — Heating Element (Electric Models)
If the thermal fuse tests good but the dryer still produces no heat, the heating element is the next component to check on LG electric dryers. The element is a coiled nichrome wire assembly mounted in the heating chamber at the rear of the drum. A broken coil produces complete heat loss; a partially broken coil sometimes causes intermittent or weak heat. To test: with the rear panel off, disconnect the element wiring harness and test across the two element terminals with a multimeter in resistance (ohm) mode. A working LG heating element reads approximately 8–20 ohms depending on model; an open circuit (no reading) means the element has failed. LG heating element assemblies run $35–$75 online. While the element is out, inspect the element housing for burn marks or metal debris, which indicate an arc that damaged the element — find and correct the cause before installing the replacement.
Step 3 — Gas Igniter and Flame Sensor (Gas Models)
On LG gas dryers, a glowing igniter heats a gas valve until a flame sensor allows the gas valve to open and the burner to ignite. A failed igniter produces no heat but the drum still tumbles. A failed flame sensor (also called a radiant sensor) causes the igniter to glow but the gas valve never opens — the igniter cycles on and off repeatedly with no sustained flame. To observe: remove the front lower panel and watch the burner through a crack in the door during a heat cycle. The igniter should glow orange within 30–60 seconds; if it glows but no flame appears, the radiant sensor has failed. If it never glows, the igniter itself has failed (test with a multimeter: an LG igniter reads approximately 50–400 ohms; an open circuit means failure). Igniters run $20–$45; radiant sensor kits run $15–$35. These are among the most straightforward repairs on LG gas dryers.
Step 4 — High-Limit and Cycling Thermostats
LG dryers use two thermostats in the heating circuit: the cycling thermostat (which cycles heat on and off to maintain drum temperature) and the high-limit thermostat (a secondary safety device). Both are mounted on the exhaust duct or heating element housing. A failed cycling thermostat stuck open causes no heat; stuck closed causes overheating (and eventually blows the thermal fuse). A failed high-limit thermostat produces no heat. Test both with a multimeter in continuity mode: a good thermostat at room temperature should show continuity. Thermostats run $10–$25 each. When replacing a blown thermal fuse, always test the cycling thermostat as well — a failed cycling thermostat is often what caused the fuse to blow, and replacing only the fuse repeats the failure.
Step 5 — Moisture Sensor Bars and Control Board
LG dryers use two metal sensor bars inside the drum, typically near the lint filter, to detect moisture in the load and determine when clothes are dry. Fabric softener sheet residue coats the bars and causes the dryer to conclude clothes are dry prematurely — the cycle ends with damp clothes that feel like they 'weren't heated.' Clean the sensor bars with rubbing alcohol on a cloth until they are bright bare metal. If cleaning does not resolve the issue and all heating components test good, the control board may not be sending voltage to the heating circuit. On LG models, the display shows fault codes for heating issues: check the code (consult the model's service manual or the LG support site) before ordering a control board — a board diagnosis requires confirming the relay command voltage with a multimeter, not just swapping the board speculatively. LG control boards run $80–$200 in parts.
When to Call a Specialist
Call a technician if: the thermal fuse blows again within a few weeks of replacement (the vent duct has a restriction or blockage that needs professional cleaning or rerouting), the heating element housing shows arc damage, the control board relay has failed on an LG steam or ThinQ model, or the unit is an LG heat pump dryer (a fundamentally different condensing-heat mechanism that requires specialist tools and service procedures). We service LG electric, gas, and heat pump dryers across Fairfax County, McLean, Arlington, Herndon, Reston, Vienna, and the greater D.C. metro — same-day appointments available. Call (571) 571-1664.
Frequently Asked Questions
Why is my LG dryer running but not producing heat?
The most common cause is a blown thermal fuse — a one-time safety device on the exhaust duct that opens permanently when the dryer overheats, almost always from a clogged vent duct. The drum keeps tumbling because the motor circuit is separate. Test the fuse with a multimeter (no continuity = blown). Replace the fuse AND clean the entire dryer vent from the dryer to the exterior wall cap — skipping the vent cleaning means the new fuse will blow again within weeks.
How do I check LG dryer error codes?
On LG dryers with a display, fault codes appear automatically or by pressing the Power and Temp buttons simultaneously for three seconds. Common heating codes: d80, d90, d95 (vent blockage — the number indicates approximate blockage percentage), tE (thermistor error), HE (heating error). On models without a display, the LED buttons blink in a sequence corresponding to an error code — count the blinks and cross-reference your model's service manual. The d80/d90/d95 codes are diagnostic gold: they tell you to clean the vent immediately, before the thermal fuse blows.
How much does LG dryer repair cost in Northern Virginia?
LG dryer heating repair in Northern Virginia typically runs $90–$300 depending on the fault. Thermal fuse replacement (including vent inspection) is $100–$190. Heating element replacement runs $140–$240. Igniter or radiant sensor replacement (gas models) is $110–$200. Thermostat replacement is $90–$170. Control board diagnosis and replacement runs $180–$360. We provide an upfront quote after diagnosing the specific fault — 90-day workmanship warranty on all repairs.
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