A dryer that spins happily but leaves the clothes damp and cold has a surprisingly short list of possible causes. The first thing to figure out is whether you have a gas or electric dryer, because the heat comes from completely different parts and some of the checks are different.
Safety first
- •If you smell gas, stop. Don't flip switches, unplug anything, or use your phone inside. Leave the house, then call your gas utility (SoCalGas in most of the area) or 911 from outside. Gas smell is never a do-it-yourself problem.
- •Unplug the dryer before any inspection. Electric dryers run on a 240-volt circuit, which is dangerous. Gas dryers still have 120-volt power running through them.
- •Don't run a dryer that smells like burning. Lint is highly flammable, and a dryer that's overheating is a fire risk.
Is it a gas or an electric dryer?
Look at the back. A gas dryer has a gas line (usually a flexible yellow or stainless connector) running to a shut-off valve, and a standard three-prong plug. An electric dryer has a large, heavy-duty plug with three or four prongs and no gas line. Many garages and laundry closets in older LA homes and apartment buildings are plumbed for gas, while newer condos and ADUs are often electric only.
Electric dryers: start at the breaker
An electric dryer uses two circuit "legs" of the 240-volt supply. The drum motor runs on one leg; the heating element needs both. If one side of the double breaker trips, the dryer can still tumble but produce no heat at all. It's the most overlooked cause of an electric dryer running cold.
Go to your electrical panel and find the dryer's double breaker. Switch it fully off, then back on. Even if it looks like it's in the "on" position, one side may have tripped. If it trips again, don't keep resetting it — that points to a fault that needs a technician or an electrician.
If the breaker is fine, the likely causes are:
- •A burned-out heating element. The coil inside the heater housing can break, often after years of running with a restricted vent.
- •A blown thermal fuse. This one-time safety fuse cuts heat (and on some models, the whole dryer) when the dryer overheats. It almost always blows because of a clogged vent. Replacing the fuse without fixing the vent means it will blow again.
- •A failed high-limit thermostat or cycling thermostat. These regulate temperature and cut heat if it rises too high.
Gas dryers: watch the igniter
On most gas dryers you can see the burner through a small inspection hole or by removing a lower front panel (with the power off and the gas valve closed). With the dryer running on a heat setting, watch what happens:
- •The igniter glows, then a flame appears, and heat comes on. The burner system is working, and the problem is probably airflow or a thermostat.
- •The igniter glows and then goes out without a flame. This often points to the gas valve coils, which open the valve once the igniter is hot enough.
- •The igniter doesn't glow at all. The igniter itself may have failed, or a thermal fuse or flame sensor in the circuit is open.
Also make sure the gas shut-off valve behind the dryer is fully open. It's common for it to be bumped partially closed after the dryer has been moved.
Anything beyond looking should be left to a technician. Gas valves and burner assemblies shouldn't be handled by homeowners.
The vent is usually the real culprit
Whether gas or electric, the most common reason dryers stop heating properly is a restricted vent. A dryer needs to push hot, damp air out of the house. If it can't, heat builds up inside, safety components trip, and the drying time gets longer and longer before the heat stops altogether.
LA homes have a few vent layouts that make this worse:
- •Garage laundry with a long vent run. Many Valley, South Bay and Long Beach homes have the washer and dryer in the garage, with the vent running through a wall or up into the ceiling. The longer the run and the more bends it has, the more lint settles inside. Summer garage heat adds to the load.
- •Roof and interior vents in condos and apartments. Vents that run up through several floors or out through the roof are harder to clean and easy to forget.
- •Converted garages and ADUs. When a laundry area gets moved during a conversion, the vent is sometimes routed with flexible foil duct or extra bends that restrict airflow.
If you're in the Valley, where garage laundry is especially common, our Van Nuys dryer repair page covers local service in that area.
LG dryers with Flow Sense display d80, d90 or d95 to warn about increasing levels of vent restriction. Other brands may simply show longer drying times or a "check vent" light.
A quick vent test you can do
- Clean the lint screen completely, including washing it with warm soapy water if it has a film from dryer sheets.
- Go outside to where the vent exits and run the dryer on a heat setting. You should feel a strong flow of warm air, and the flap should open fully.
- If the airflow is weak, disconnect the duct from the back of the dryer (with the power off) and run the dryer briefly. If airflow is strong at the dryer but weak at the exit, the duct is blocked.
- Look at the duct itself. Crushed flexible foil or plastic duct should be replaced with a rigid or semi-rigid metal duct.
When to book a repair
- •The breaker is fine and the vent is clear, but there's still no heat
- •The thermal fuse has blown more than once
- •The igniter isn't working or the burner won't stay lit
- •The dryer is getting unusually hot on the outside
- •You'd rather not open panels or deal with a gas appliance yourself
How a technician diagnoses it
A technician will check the power supply, then test the heating circuit component by component: the element or burner assembly, the thermal fuse, the thermostats, and the controls. Airflow gets checked too, because replacing a part without fixing the airflow problem usually means the same fault comes back. You can learn more about the dryer work we do on our dryer repair page.
Keeping the heat coming
- •Clean the lint screen before every load.
- •Have the full vent run cleaned regularly — more often for long garage or roof runs.
- •Don't overload the dryer; tumbling air needs room.
- •If you have a gas dryer, keep the area around it clear of stored items, and make sure the gas connector is a flexible appliance connector in good condition. In earthquake country, a flexible connector lets the dryer shift slightly without stressing the gas line.
Frequently asked questions
Why does my dryer take two or three cycles to dry clothes?
Most often, it's airflow. A partially blocked vent lets the dryer run but slowly bakes the clothes instead of drying them. Clear the vent before replacing parts.
Can I replace the thermal fuse myself?
It's a simple part on many dryers, but it's a safety device. If it blew, something made the dryer overheat. Find and fix that cause first.
Should I switch from gas to electric?
That's a bigger decision involving your home's wiring and gas lines, and it's outside the scope of a repair. If your current dryer is working well after a repair, there's no urgent reason to switch.