LG Dryer Not Heating: Flow Sense Codes and Complete Diagnosis
An LG dryer not heating is often reported by the machine itself before the laundry gives it away. LG fits a Flow Sense system that monitors exhaust restriction, and its warnings are the most useful diagnostic information you will get from any dryer brand, provided you know what they mean.
Short version: on electric LG dryers the heater assembly, the thermal fuse and the thermistor cover most no-heat faults. If you are seeing d80, d90 or d95 on the display, the machine is telling you the vent is blocked, and that is the cause of most of the rest.
Start with the Flow Sense reading
LG dryers display d80, d90 or d95 to indicate how badly the exhaust is restricted. d80 means the duct is roughly 80 percent blocked. d95 means it is almost completely obstructed.
These are not faults with the dryer. They are the dryer telling you that the venting is choking it, and if you ignore them the restriction will eventually take out the thermal fuse or the heater. Clear the duct run, confirm the exterior flap opens, and shorten the run if it has more than a couple of elbows.
The other code worth knowing is tE1 or tE, which indicates a thermistor fault, and dE, which is a door circuit problem that can stop the heating cycle entirely.
1. Failed heater assembly
LG supplies the heating element as a complete assembly with the housing, so the unit is replaced whole rather than rebuilt. It fails from age, surges, or sustained running behind a restricted vent.
A healthy LG heater assembly generally reads somewhere around 10 to 15 ohms across the element terminals. An open circuit confirms failure. Because the element is enclosed, a meter reading is far more reliable than trying to inspect it visually.
2. Blown thermal fuse
The thermal fuse is a single-use safety device that cuts the heater circuit permanently on overheat. It does not reset.
Testing is simple continuity. What matters more is why it blew. On LG machines specifically, a blown thermal fuse alongside a history of d80 or d90 warnings is an almost certain sign that the venting was the underlying problem all along.
3. Thermistor out of range
LG relies heavily on thermistors rather than mechanical thermostats. The thermistor reports drum temperature to the control board, and the board decides whether to energise the heater. A thermistor reading incorrectly can leave the heater switched off permanently while the element itself is perfectly healthy.
This is measured as resistance against a temperature chart, typically in the region of 10k ohms at room temperature, with a smooth change as it warms. It is not a continuity check, and it usually needs a technician with the service data for your model.
4. Failed thermostat or high-limit cut-out
LG fits a high-limit thermostat on the heater housing as a backup to the thermistor. When it opens, the heater is cut even though everything else appears normal.
The pattern to watch for is heat that stops partway through a cycle rather than never starting, or laundry that comes out warm but persistently damp.
5. Restricted airflow
This deserves its own heading on LG machines because Flow Sense makes it measurable. Lint packs into the duct, the exterior flap sticks, or a long run with multiple bends strangles the exhaust.
Clearing the entire duct run rather than just the lint filter is the fix. If d80 or higher returns within weeks of a clean, the duct itself is too long, too narrow or badly routed and needs rerouting rather than cleaning.
6. Door switch faults
A failing door switch can interrupt the heating circuit while still allowing the drum to turn. LG reports this as dE on many models. The symptom is a dryer that runs normally but never heats, which is easy to mistake for an element failure.
7. Gas models: igniter and gas valve coils
On a gas LG dryer, disregard the heater assembly. Watch the burner through the inspection port. Igniter glows but no flame means the gas valve coils have failed, and they are replaced as a pair. No glow at all points at the igniter or the flame sensor.
Gas repairs are not a DIY job. Working on gas valve assemblies without training risks a leak or a fire, and gas appliance work in Texas should be carried out by a qualified technician.
LG Dryer Not Heating: is it worth repairing?
A thermal fuse or thermostat is inexpensive and worth doing on any machine. A heater assembly is a mid-range repair and sensible on a dryer under roughly eight years old. A failed main control board on an older LG is generally where replacement becomes the better financial decision.
When to call a technician for a LG Dryer Not Heating
If the duct is genuinely clear, the breaker has been reset and Flow Sense is no longer complaining but the dryer still will not heat, the fault is a component that needs testing under power.
Denton Repair Services connects homeowners across Denton County with local appliance technicians, and you can arrange dryer repair in Denton, TX for gas and electric LG models. If the machine smells hot or the cabinet is uncomfortable to touch, stop using it and treat it as an emergency appliance repair.
Before committing, it is worth reading our guide to appliance repair prices in Denton, or seeing the full list of appliance repair services.
For model-specific manuals, LG publishes its own product support documentation.
Call (940) 229-7035 to arrange a diagnosis in Denton County.