Michael Thompson Key Takeaways
- A blown thermal fuse is the most common cause — it trips when exhaust venting is restricted
- Always check the exhaust vent first — a clogged vent causes overheating and fuse failures
- Electric LG dryers use a heating element (From $40) that degrades over time
- Gas LG dryers may have a faulty igniter or gas valve solenoid preventing heat
The Bottom Line
A clogged exhaust vent is behind most LG dryer heating failures. Clean the vent, replace the thermal fuse if blown, and the dryer should heat again. Recurring fuse failures point to a vent restriction that needs permanent correction.
LG dryer not heating — here's what you need to know.
Your LG dryer tumbles but clothes come out damp and cold — a frustrating problem that's usually caused by a handful of common component failures. The key is checking the exhaust system first, since a blocked vent is both the most common cause and the most dangerous if left unaddressed.
Check the Exhaust Vent First
Before diagnosing internal components, inspect the dryer's exhaust vent. Disconnect the vent from the back of the dryer and run the dryer for a few minutes. If it heats up with the vent disconnected, the vent duct is clogged. Lint accumulation in the exhaust duct restricts airflow, causing the dryer to overheat and trip the thermal fuse. Clean the entire vent run from the dryer to the exterior wall. The Consumer Product Safety Commission reports that clogged dryer vents cause approximately 15,000 house fires annually.
Test the Thermal Fuse
The thermal fuse is a one-time safety device that blows when the dryer overheats. On LG dryers, it's located on the blower housing or exhaust duct inside the dryer. Unplug the dryer, access the fuse (usually behind the rear panel), and test it with a multimeter for continuity. A blown fuse reads open (no continuity). Replacement fuses cost From $5, but always identify and fix the cause of the overheat before replacing the fuse, or it will blow again.
Heating Element (Electric Dryers)
LG electric dryers use a coiled heating element that glows red when active. Over time, the element can break or develop open spots. Test with a multimeter — a good element shows 10–30 ohms of resistance. A broken element reads infinite resistance. LG heating elements cost From $40 for the part. The element is located inside the heater housing, accessible by removing the rear or front panel depending on your model.
Gas Igniter and Valve Solenoids (Gas Dryers)
LG gas dryers use an igniter to light the burner flame. A weak igniter may glow but fail to open the gas valve, resulting in no heat. Watch the igniter through the lower front panel — it should glow bright orange, then the flame should ignite within 30 seconds. If the igniter glows but no flame appears, the gas valve solenoids are likely faulty. If the igniter doesn't glow at all, replace the igniter (From $30). Solenoid replacements cost From $20 for parts.
Cycling Thermostat and High-Limit Thermostat
These thermostats regulate dryer temperature. The cycling thermostat turns the heat on and off to maintain temperature, while the high-limit thermostat shuts off heat if the dryer gets too hot. Both can fail and prevent heating. Test each with a multimeter at room temperature — they should show continuity. Replacement thermostats are inexpensive (From $10 each), and the repair is straightforward with basic tools.