Dryer Not Heating? Safe Checks for Electric, Gas & Heat-Pump Dryers

Dryer tumbles but won't heat? Start with the manufacturer's safe checks — breakers, gas valve, airflow and cycle settings — then know when it's a technician job. Electric, gas and heat-pump dryers differ.

Verification: Manufacturer checks below are taken from Whirlpool Product Help, “Dryer is Not Heating” (checked 2026-09-11). No ranking of causes is stated — the cause depends on the dryer design and model. Gas-component, live-electrical and sealed-system work is referred to qualified service.

Safety first

Electric dryers: unplug the dryer before opening anything.
Gas dryers: do not open the gas valve, burner or gas train. Shut the gas supply off and call qualified service for any gas-component work.
Every dryer: a clogged vent is a fire hazard. Keep the lint screen and vent clean.
Heat-pump dryers: the unit uses a sealed refrigerant system — that work is technician-only.
Anything that needs a multimeter on live circuits, line voltage, gas components, or the sealed system is a licensed-technician job. This guide is informational only.

First: is it actually not heating?

Before diagnosing anything, confirm the dryer isn’t heating — Whirlpool’s own test:

Select a heated timed cycle.
Run it for 5 minutes with the dryer empty.
Open the door and feel inside.

If it’s cold, keep going below. If it’s warm, the dryer is producing heat on that cycle — but warmth on this one test does not by itself prove the cause of slow drying. Use your model’s manufacturer checks (below), not a conclusion drawn from a single observation.

Also check the cycle selection: an Air Only / Air Fluff cycle never adds heat by design. If that’s what’s running, the dryer is behaving correctly.

Safe external checks by dryer type

Conventional electric dryers

Whirlpool documents these home-level checks before any component testing:

Check both circuit breakers. An electric dryer needs a separate 30-amp circuit fused on both sides of the line — that means two breakers. One runs the motor (the drum turns); the other runs the heating element. If one is tripped, the dryer can tumble but not heat. Check that both are on.
Power supply. Electric dryers need a 240-volt supply and a correctly installed power cord (3- or 4-wire). If you don’t have 240 V, or the cord/terminal work is wrong, that’s an electrician job — don’t improvise line-voltage work.

Gas dryers

Is the gas supply connected and the shutoff valve open? Whirlpool notes the drum of a gas dryer will turn but the dryer will not heat if the gas shutoff valve is closed — the valve is open when its handle is parallel to the gas pipe.
Beyond checking that the valve is open, gas-component diagnosis and repair is a qualified-service job, not a DIY repair. If the dryer has gas supply and still won’t heat, stop and call a technician.

Heat-pump dryers

Heat-pump dryers don’t use a heating element or a gas igniter — they move heat with a sealed refrigerant system. Because that system is sealed, no user-level “no heat” component checks apply. Route heat-pump no-heat faults to qualified service with your model number.

Airflow and filters: the free, fire-safety check

What you clean depends on whether the dryer is vented or ventless.

Vented dryers (most conventional electric and gas models) exhaust outside:

Clean the lint screen (wash with soap and water if fabric-softener residue is present).
Whirlpool recommends cleaning the home venting run from the dryer to the outside every one to two years, or whenever drying performance drops.
Check the vent run: rigid metal, as short and straight as possible, and clear.

A clogged vent is a fire hazard, and it also causes long dry times.

Ventless heat-pump dryers do not exhaust outside. Whirlpool describes heat-pump dryers as ventless — they use a refrigeration system to dry and recycle the same air at low temperatures — so there is no outside vent run to clean. For these models, follow the manual’s filter maintenance instead:

Clean the lint screen (in the door opening).
Clean the bottom filter every 5 loads (Whirlpool documents this for compact heat-pump models).

Sealed refrigerant-system work on a heat-pump dryer stays technician-only.

Filter/vent maintenance is the free check that applies to every dryer — but what you clean depends on your dryer type.

If it still won’t heat: component diagnosis is model-specific

No-heat causes and component locations vary by model and design, so this is where you need your model’s service information. Do not assume a universal layout, a one-size-fits-all part, or a universal location for a part.

What can be involved (not a ranking, and not proof of failure from a symptom):

Thermal fuse / thermal cut-off (some electric models). A protective device that can open when a dryer overheats. Whether it exists, where it sits, and what happens when it opens all vary by model and by the circuit it protects — the symptom is not identical on every dryer, and restricted airflow is one possible cause, not the only one. Check your model’s service information; if the device has opened, find and fix the underlying cause so it doesn’t recur.
Heating element (electric). A coiled element inside the heater housing that can break with age.
Igniter, flame sensor, or gas valve coils (gas). These are gas components — testing and replacement are a qualified-service job.
Thermostats / high-limit thermostat (electric). Temperature controls that can fail and stop heat.

Difficulty: the external checks above are Easy. Component-level electrical testing is Moderate to Advanced, and gas-component, live line-voltage and sealed-system work is a technician job — this guide does not walk you through those.

Error codes on modern dryers

Modern dryers (Samsung, LG, Whirlpool) may display codes for heating faults. One that surprises people: on LG gas dryers, a display that looks like 9A5 is not an error code — LG says the segments are spelling out “GAS,” meaning the dryer isn’t getting gas supply. Check that the gas shut-off valve is fully open and the supply line isn’t kinked. (Source: LG Dryer Error Code List — LG US Support.) Dryer codes vary by brand and model — confirm yours in the model’s manual, and see the applicable manufacturer code list for a dryer, not a washer.

When to call a qualified technician

It’s a gas dryer and the gas supply is present and the valve is open.
It’s a heat-pump dryer.
You’d need to test live electrical circuits, line voltage, or replace a heating element.
The dryer heats but trips a breaker, or you smell gas (leave the area and call your gas provider).

Parts & tools (categories — diagnose first, don’t guess)

Prices and part numbers vary by model, and this guide does not quote them. Buy only what a model-specific diagnosis shows you need:

Dryer vent cleaning kit or lint brush → search “dryer vent cleaning kit”
Replacement vent hose (rigid metal) → search “dryer vent hose rigid metal [diameter]”
Multimeter → only for the tests your model’s service info documents, never on live circuits
Model-specific parts (element, fuse, igniter, coils) → search “dryer [part] for [your model number]” after diagnosis

FAQ

Q: My dryer tumbles but won’t heat — what should I check first? A: Confirm a heated cycle is selected (not Air Only), then run Whirlpool’s 5-minute heat test. On electric dryers check both circuit breakers; on gas dryers confirm the shutoff valve is open. All of those are free. If it still won’t heat, component diagnosis is model-specific.

Q: Why does my dryer keep blowing the thermal fuse? A: A thermal fuse opens because the dryer overheated, and the usual reason is restricted airflow. Clean the lint screen and vent. If it keeps happening after the airflow is clear, have it serviced.

Q: My gas dryer’s igniter glows but there’s no flame — can I fix it myself? A: That points at gas components (igniter, flame sensor or valve coils), which are a qualified-service job. Don’t open the gas train yourself.

Q: Is a clogged vent really that serious? A: Yes — a clogged dryer vent is a fire hazard and also causes long dry times. Whirlpool recommends cleaning the home vent run every one to two years.