LG Dryer Not Heating: Causes, Flow Sense Codes and Repair Costs

An LG dryer that tumbles without heat has 5 usual causes, and your machine has probably been warning you about the main one for months. LG builds airflow monitoring into the control — the d80, d90 and d95 messages are the dryer telling you the duct is 80, 90 or 95 percent blocked, long before the heater circuit gives up. Across 1,301 completed dryer repairs our median invoice is $348, parts and labour included.

Match What Your Dryer Is Doing

On an LG the display is part of the diagnosis. Note any code you have seen in the last few months, even one you dismissed, then find your row below.

Flow Sense: The Warning Almost Everyone Ignores

LG puts a pressure-based airflow check into its dryers and reports the result on the display. When restriction reaches roughly 80 percent, the machine shows d80. At 90 percent it shows d90, and at 95 percent d95. These are not faults in the machine. They are measurements of your duct, and they are the most useful thing any dryer manufacturer has ever put on a control panel.

The problem is that a dryer showing d80 still dries clothes, just more slowly, so the message gets cleared and forgotten. Meanwhile the restriction keeps rising, cabinet temperature climbs with it, and the safety devices that protect the heater start working harder than they were designed to. Eventually a thermal fuse opens or the heater assembly fails, and the machine goes cold. At that point the owner reports a dryer that stopped heating with no warning. The warning was there for months, in numbers.

There is a second reason to take those codes seriously. LG also uses the airflow reading to decide when a sensor cycle is finished. A restricted duct makes the machine misjudge the load, so cycles end early with damp laundry — which is why “it does not dry” and “it does not heat” often turn out to be the same fault seen at two different stages.

One Heater Assembly, Two Thermistors

On an electric LG the heating element does not sit loose in the cabinet. It comes as an assembly: the coil inside a metal housing, with the temperature sensors and safety devices mounted on the same casting. That design matters for two reasons.

First, the failure is usually the assembly rather than a single component, and LG generally supplies it that way. Second, the thermistors on that housing are what the control uses to decide whether to call for heat at all. A thermistor reading a temperature higher than reality means the board thinks the dryer is already hot and never switches the coil on. The heater is perfectly good, the machine runs cold, and no amount of testing the element will reveal it. On the display this often shows as a tE message, and where it does not, it shows as a dryer that simply refuses to warm up.

This is the difference between a dryer that will not heat and a dryer that is not being asked to heat. The first is a broken circuit and reads open on a meter. The second reads perfect on every part and still produces cold air, because the fault is in the information the board is working from. Getting that distinction right in the first ten minutes is what stops a repair turning into two visits.

What You Can Check in Ten Minutes

If airflow is strong, both breakers are on and the drum still runs cold, the fault is in the heater assembly, a thermistor or the board, and it needs a meter to separate them. That is where guessing gets expensive, because those three are three very different prices for one identical symptom.

What a Technician Actually Checks

The order matters, because each test rules out a branch of causes instead of replacing parts and hoping.

What LG Dryer Heat Repair Costs

These are complete invoices from our own jobs — part, labour and the visit together, not a parts price with extras added later. Ranges show the middle half of jobs, and the count is how many repairs each figure is based on.

Clearing the duct during the same visit is not a separate job. What raises the bill is a heater assembly fitted before the airflow was measured, followed by a second visit for the same fault a month later.

Electric and Gas LG Dryers Fail Differently

On an electric LG the heat comes from coils inside the heater housing, so the suspects are the assembly, the thermal fuse, the high-limit thermostat and the thermistors. The 240V supply is worth ruling out before any of them, because losing one leg is common and imitates a dead element perfectly.

On a gas LG there is no element at all. Heat comes from a burner and the failure sits in an ignition sequence: the igniter glows, the flame sensor confirms it is hot enough, the valve coils open and gas lights. When one weakens, the burner either never lights or lights briefly and quits. A telling pattern is a dryer that heats on the first load of the day and refuses on the second — that is typically a valve coil failing once it warms up, and it is invisible on a cold test.

Telling us which type you have when you book saves diagnostic time and often means the right part is already on the van rather than ordered after the visit.

Repair or Replace

Dryers are the appliance where repair wins most often, because the expensive parts — the motor and the drum — are rarely what fail. Heat faults are cheap parts in an otherwise healthy machine.

Why the Same Fault Comes Back

Most repeat visits on dryers are not a bad part or bad workmanship. They are the same restricted duct, unfixed. That is doubly true on an LG, because the machine had already put a number on the restriction and nobody acted on it. Fitting a heater assembly into a duct that reads d90 buys a few weeks, not a repair.

The second version of this loop is the long duct. On a run that goes up through a wall and across an attic, lint settles in the horizontal sections where air slows down. Cleaning the first metre behind the machine feels like progress and changes almost nothing, because the restriction is five metres away where nobody looks. If your run is long, the whole duct needs clearing — and the Flow Sense reading after the clean is how you know whether you actually got it.

The third is worth knowing if you have a stacked or closet-installed LG. A dryer in a tight closet with a louvred door can starve for intake air even with a perfect duct, and it will overheat exactly as if the duct were blocked. The fix is ventilation into the closet rather than anything inside the machine, and it is missed constantly because everyone measures the outlet and nobody measures the inlet.

What It Costs You to Keep Running It

A restricted dryer does not just take longer. It runs its heater far more often for the same result, and every extra cycle is energy you pay for. Two cycles instead of one is roughly double the electricity or gas for the same laundry, week after week, and that adds up faster than the repair does.

The heat also stays inside the cabinet, which shortens the life of the heater assembly, the thermistors and the belt — all of them sitting in air hotter than the design allows. A machine that spends a year drying badly does not fail once. It fails repeatedly, and each fault looks unrelated from the outside.

And there is the fire risk. Lint is one of the most flammable things in a house, and a blocked duct packs it against a heat source. Fire services in the United States attend thousands of dryer fires every year, and failure to clean is the most frequently cited cause. That is the real argument for treating a d80 message as a fault rather than a nuisance.

How Often the Duct Needs Clearing

Once a year covers most households. Make it twice if any of these apply: four or more people in the house, a duct longer than about three metres, a vent through the roof, or pets that shed. Bedding and towels shed far more lint than clothing, so a home that washes plenty of both fills a duct faster than the calendar suggests.

On an LG you have an advantage worth using: the machine will tell you. Run a cycle after cleaning and check that no d80 message appears. If it still does, the clean did not reach the restriction. Beyond that, two habits cost nothing — clean the lint screen every single load rather than every few, and once a month watch the outside flap while the dryer runs. Weak air there is months of warning before anything breaks.

What To Do Right Now

Write down any d80, d90, d95 or tE message you have seen. Clean the lint screen and the slot under it, pull the machine out and check the hose, then reset the double breaker and feel the outside vent while a cycle runs. If air comes out strongly, the breakers are on and the drum still runs cold, the fault is in the heater assembly or a thermistor — and a meter separates those two for less than replacing both.

LG Dryer Not Heating FAQ