Dryer Taking Too Long to Dry? Check These Causes

Why Is My Dryer Taking So Long to Dry?

A conventional clothes dryer relies on three main factors:

• Adequate heat.
• Proper airflow.
• Effective moisture removal.

The dryer heats air, moves it through the laundry, and exhausts moisture through the vent system.

If airflow becomes restricted, moisture cannot leave the dryer efficiently.

As a result, clothes may remain damp even after a long drying cycle.

The same symptom can also occur when:

• The drum is overloaded.
• Clothes are excessively wet after washing.
• The selected cycle uses low heat.
• The moisture sensor ends the cycle too early.
• The heating system is not working correctly.
• The exhaust installation restricts airflow.

It is important to distinguish a dryer that takes too long despite producing heat from a dryer that does not heat at all.

That difference helps determine which checks should come first.

Slow Drying vs. No Heat: What's the Difference?

Heating performance should be evaluated according to the manufacturer's instructions.

Do not remove service panels or touch internal components to check temperatures.

Most Common Causes of Long Dryer Drying Times

No single symptom confirms that a particular component is defective.

What to Check First

Is the Lint Filter Clean?

The lint filter, also called a lint screen, should be cleaned according to the owner's manual, generally after every load.

A clogged filter restricts airflow and can increase drying time.

Is the Dryer Showing an Airflow Warning?

Some appliances display messages such as:

• Check Vent.
• AF.
• Restricted Airflow.
• Flow Sense.
• d80.
• d90.
• d95.

These indicators vary by manufacturer and model.

When they indicate restricted ventilation, the underlying cause needs to be investigated.

Is the Drum Overloaded?

Clothes need enough room to tumble freely.

A tightly packed load can prevent air from moving properly through the fabric.

Are Clothes Too Wet Before Drying?

If the washing machine does not spin effectively, the dryer receives more moisture than usual.

This can greatly extend drying time even when the dryer itself is working correctly.

Is the Correct Cycle Selected?

Delicate, energy-saving, and low-temperature cycles may use less heat.

Some are intentionally longer to protect fabrics or reduce energy consumption.

Step-by-Step Dryer Troubleshooting

Step 1: Identify the Dryer's Behavior

Before performing maintenance, consider:

• Do the clothes get warm?
• Has drying time increased recently?
• Do you need two or more cycles for a normal load?
• Does the problem occur with every load?
• Do only heavy items remain damp?
• Are error codes displayed?
• Does the laundry room become unusually hot or humid?

These details help distinguish loading, ventilation, and heating problems.

If you notice overheating or signs of a severely restricted vent, stop using the dryer.

Step 2: Clean the Lint Filter

The lint filter is the first component to check.

Procedure:

• Turn off the dryer.
• Allow it to cool if necessary.
• Remove the lint filter according to the manual.
• Remove accumulated lint.
• Look for residue trapped in the mesh.
• Reinstall the filter correctly.

Never operate the dryer without the lint filter required by the manufacturer.

Step 3: Check for Residue on the Lint Screen

Some laundry products, including certain dryer sheets, can leave residue on the filter mesh.

Even when the filter appears free of lint, this film may restrict airflow.

If the manufacturer permits:

• Remove the filter.
• Wash it with warm water.
• Use a soft brush if recommended.
• Remove the residue.
• Rinse thoroughly.
• Allow it to dry completely.
• Reinstall the filter.

Do not use wire brushes or harsh cleaning products.

Step 4: Check the Laundry Load

An overloaded dryer can prevent air from circulating properly through clothes.

Make sure the laundry can tumble freely.

Avoid:

• Filling the drum completely.
• Packing comforters tightly.
• Mixing large quantities of heavy towels with lightweight clothing.
• Drying loads that exceed the dryer's rated capacity.

Divide large loads when necessary.

There is no single universal drum-fill percentage that applies to every model.

Step 5: Separate Clothes by Fabric Weight

Different fabrics absorb and release moisture at different rates.

Examples include:

• Thick towels.
• Jeans.
• Sweatshirts.
• Lightweight T-shirts.
• Synthetic fabrics.
• Bedding.

When very heavy and lightweight items are mixed, some pieces may dry well before others.

Automatic cycles may also respond differently to mixed loads.

Separate similar fabrics whenever practical.

Step 6: Check the Washing Machine's Spin Cycle

Extremely wet clothes need more drying time.

Check whether the washing machine is completing its spin cycle properly.

Warning signs include:

• Clothes dripping water when removed.
• Towels feeling much heavier than usual.
• The washer stopping before spinning finishes.
• Excess water remaining inside the washing machine.
• Repeatedly unbalanced loads.

If your washing machine is not removing enough water, address that issue before assuming the dryer is malfunctioning.

Step 7: Review the Selected Drying Cycle

Make sure the cycle matches the laundry load.

Common U.S. dryer settings include:

• Normal.
• Heavy Duty.
• Towels.
• Bedding.
• Bulky.
• Delicates.
• Timed Dry.
• Sensor Dry.
• Eco or Energy Saver.
• Air Only or Air Fluff.

Names vary by manufacturer.

Important: Air Only and Air Fluff generally do not use active heating.

Energy-saving modes may reduce heat and increase operating time.

Never select high heat for fabrics that cannot safely tolerate it.

Step 8: Inspect the Exhaust Duct

In conventional vented dryers, the dryer vent carries moist air outdoors.

Inspect only visible, safely accessible sections with the dryer turned off.

Look for:

• Crushed ductwork.
• Compressed tubing.
• Sharp bends.
• Lint buildup.
• Damaged components.
• Changes caused by moving the appliance.

Do not pull the dryer away from the wall to reach hidden sections.

Do not run the dryer with the exhaust duct disconnected as a heating test.

Step 9: Inspect the Outdoor Vent Outlet

The outdoor exhaust opening, commonly called the outdoor vent hood, allows moist air to leave the home.

From a safe location, look for:

• Leaves blocking the outlet.
• Visible lint accumulation.
• A damaged vent cover.
• Nests or other objects restricting the opening.
• Snow or ice blocking the outlet, when applicable.

If the manufacturer's instructions call for observing the vent flap during operation, do so only when there are no signs of severe blockage, overheating, or another safety concern.

Never put your hands or tools into the outlet while the dryer is operating.

Do not climb onto a roof or use an unsafe ladder to reach the vent.

Step 10: Review the Exhaust Vent's Maintenance History

Consider these questions:

• When was the exhaust duct last cleaned?
• Has the dryer been moved?
• Was the dryer recently replaced?
• Did the problem begin after a renovation?
• Does the vent run through long sections of ductwork or multiple bends?
• Is the outdoor outlet difficult to access?

Even a brand-new dryer may perform poorly when connected to an old, clogged exhaust duct.

If you suspect a blockage inside inaccessible ductwork, arrange professional inspection.

Step 11: Check for Airflow Warning Codes

Some dryer models monitor exhaust restrictions.

On certain LG dryers, d80, d90, and d95 codes indicate increasingly severe restrictions detected in the exhaust system.

On some Whirlpool models, indicators such as AF or Check Vent also warn about airflow problems.

Record the warning and consult the owner's manual.

Do not ignore a severe warning simply because the drum still tumbles.

If the appliance indicates a serious blockage, stop using it until the venting problem has been corrected.

Step 12: Consider Heating Problems

If the filter and vent appear clear but drying remains unusually slow, insufficient heating may be responsible.

In conventional electric dryers, possible components include:

• Electrical supply.
• Heating element.
• Thermostats.
• Thermal cut-off.
• Temperature sensors.
• Electronic controls.

In gas dryers, possible causes involve:

• Fuel supply.
• Igniter.
• Flame sensor.
• Gas valve coils.
• Gas valve.
• Temperature controls.

These systems require professional diagnosis.

Do not remove service panels, test electrical terminals, or handle gas components.

Step 13: Check the Moisture Sensor

Many dryers use moisture sensors to help determine when clothes are dry.

These sensors can influence automatic cycle duration.

If they are coated with residue or do not make proper contact with clothes, the dryer may end a cycle too early or produce inconsistent results.

Consult the owner's manual to locate user-accessible moisture sensors.

Do not use abrasive tools or unapproved cleaning products.

Step 14: Evaluate the Results After Basic Corrections

If there are no safety warnings and a simple check revealed an obvious issue, run an appropriate cycle according to the manual.

Observe:

• Whether clothes dry normally.
• Whether multiple cycles are still necessary.
• Whether airflow appears normal.
• Whether new error codes appear.
• Whether the dryer becomes excessively hot.
• Whether drying performance improves.

If drying remains abnormally slow, arrange professional diagnosis.

Dryer Taking Too Long to Dry: Troubleshooting Decision Tree

Decision 1: Does the Dryer Turn On and Tumble?

No.

Follow a dryer-not-starting or dryer-not-spinning troubleshooting guide.

Yes.

Continue to Decision 2.

Decision 2: Is There a Burning Smell, Excessive Heat, or Serious Vent Warning?

Yes.

Stop using the dryer and arrange appropriate inspection.

No.

Continue to Decision 3.

Decision 3: Is the Lint Filter Clean?

No.

Clean it according to the owner's manual.

Yes.

Continue to Decision 4.

Decision 4: Is the Load Too Large or Excessively Wet?

Yes.

Reduce the load or check the washing machine's spin performance.

No.

Continue to Decision 5.

Decision 5: Is the Selected Drying Cycle Appropriate?

No.

Choose the correct cycle while following fabric care instructions.

Yes.

Continue to Decision 6.

Decision 6: Is the Dryer Vent Possibly Blocked?

Yes.

Stop using the dryer and have the vent restriction corrected.

No.

Continue to Decision 7.

Decision 7: Does the Dryer Produce Heat Appropriate for the Cycle?

No.

See Dryer Not Heating: Common Causes and What to Check and arrange service when necessary.

Yes.

Continue to Decision 8.

Decision 8: Does the Problem Mainly Occur With Automatic Cycles?

Yes.

Check the load size, contact with the moisture sensor, and automatic cycle settings.

No, or the problem persists.

Continue to Decision 9.

Decision 9: Is Drying Still Taking Too Long?

Yes.

An undetected vent restriction, airflow problem, heating malfunction, or sensor issue may be responsible.

Next step: Arrange professional diagnosis.

Why the Lint Filter Matters

The lint filter collects fibers released from clothing during drying.

When it becomes clogged, air may have difficulty passing through.

This can contribute to:

• Longer drying times.
• Increased energy consumption.
• Abnormally high temperatures.
• Lint accumulation.
• Additional strain on the exhaust system.

How Often Should You Clean It?

Generally, clean the filter before or after every load, following the manufacturer's instructions.

ENERGY STAR also recommends keeping the lint filter clean to support energy efficiency.

Does a Clean Filter Mean the Vent Is Clear?

No.

Some lint can pass through the filter and accumulate inside the exhaust duct.

Cleaning the filter does not replace periodic dryer vent maintenance.

Blocked Dryer Vent: Causes and Consequences

A blocked exhaust vent is one of the most important causes of slow drying in conventional dryers.

What Can Block a Dryer Vent?

• Accumulated lint.
• Crushed ductwork.
• Excessive bends.
• Long or improperly installed ducts.
• Nests or outdoor debris.
• A damaged exterior vent hood.
• Unsuitable venting materials.

Why Does a Blocked Vent Slow Drying?

Moist air must leave the dryer drum.

When ventilation is restricted, moisture removal becomes less efficient.

The dryer may continue producing heat while clothes remain damp.

Depending on the model, thermal safety systems may also reduce or interrupt heating when abnormal temperatures occur.

Can a Clogged Dryer Vent Cause a Fire?

Yes.

Lint buildup and restricted ventilation can contribute to overheating.

Lint is combustible.

This makes vent maintenance both a performance concern and a safety priority.

Do not treat a serious vent blockage warning as a minor maintenance reminder.

Stop using the dryer until the restriction is corrected.

What Does Proper Dryer Venting Look Like?

In the United States, dryer exhaust installations must follow the manufacturer's instructions and applicable building codes.

The U.S. Department of Energy's Building America Solution Center provides guidance for conventional dryer venting.

Common recommendations include:

• Exhausting air outdoors.
• Using appropriate metal ductwork.
• Maintaining smooth interior duct surfaces.
• Keeping the route short and direct.
• Minimizing bends.
• Installing connections correctly.
• Keeping the outdoor exhaust outlet clear.

Why Should You Avoid Improper Duct Materials?

Plastic ducts and certain flexible materials may be more likely to become crushed or collect lint.

Venting requirements vary depending on the duct type and manufacturer's specifications.

Do not replace dryer exhaust components without checking the applicable installation requirements.

How Long Can a Dryer Vent Be?

There is no single maximum duct length that applies to every installation.

The allowed length depends on:

• The dryer model.
• Duct material.
• Duct diameter.
• Number of elbows.
• Exterior termination design.
• Applicable local building codes.

A commonly cited residential code reference is 35 feet of equivalent duct length for certain configurations, with reductions for elbows.

However, the actual installation must comply with the manufacturer's instructions and applicable code.

Do not treat 35 feet as permission to install that length on every dryer.

Can You Install a Screen Over the Outdoor Vent?

Do not install a screen that can trap lint over a conventional dryer exhaust outlet.

Use the appropriate backdraft damper or termination fitting specified by the manufacturer and applicable codes.

How to Recognize Restricted Dryer Airflow

Airflow problems can produce several symptoms.

Clothes Are Warm but Still Damp

This may indicate that the dryer is producing heat but cannot remove moisture efficiently.

The Laundry Room Becomes Very Hot or Humid

This may suggest an exhaust leak, improper ventilation, or another installation problem.

The Dryer Becomes Excessively Hot

Restricted airflow or a technical malfunction may be responsible.

Stop using the dryer until the problem has been evaluated.

Weak Airflow at the Outdoor Vent

When a safe external check is permitted and there are no signs of severe blockage, observing the outlet flap may provide clues.

However, a visual inspection cannot confirm that the entire duct is clear.

Airflow Warnings on the Display

Vent-related error codes may indicate restrictions that require correction.

Do not disable sensors or ignore recurring warnings.

Can Overloading Make a Dryer Take Longer?

Yes.

During drying, clothes need to tumble so heated air can reach different fabric surfaces.

An oversized load can:

• Restrict airflow.
• Prevent clothes from moving freely.
• Trap moisture between garments.
• Increase cycle duration.
• Affect sensor performance.

Signs of Overloading

• Clothes are packed tightly together.
• Garments become tangled.
• Comforters cannot tumble freely.
• Some items are dry while others remain wet.
• Multiple cycles are frequently necessary.

What to Do

Divide the load.

Dry bulky items separately when recommended by the manufacturer.

Do not compensate for an overloaded drum by selecting a higher temperature.

The temperature must remain appropriate for the fabrics.

Could Your Washing Machine Be Causing Slow Drying?

Yes.

The amount of water left in clothes after washing directly affects drying time.

If the washer does not spin effectively, the dryer must remove much more moisture.

Possible Washing Machine Problems

• Unbalanced loads.
• Interrupted spin cycles.
• A spin speed that is too low.
• Drainage problems.
• A malfunctioning spin system.

What to Look For

If clothes come out soaking wet, unusually heavy, or dripping water, check the washing machine first.

Even a properly functioning dryer will take longer when clothes contain excessive residual water.

Sensor Dry vs. Timed Dry: What's the Difference?

Sensor Dry

Sensor Dry programs use sensor information to adjust cycle duration.

Depending on the dryer, the system may consider:

• Moisture in the clothes.
• Temperature.
• Operating conditions.
• Selected settings.

This helps avoid overdrying.

However, results may vary when:

• The load is very small.
• Different fabrics are mixed.
• Clothes do not make good contact with the sensor.
• The sensor has residue buildup.
• A lower dryness setting is selected.

Timed Dry

Timed Dry operates for a user-selected duration according to the chosen settings.

It may be useful in certain situations, provided the manufacturer allows it and there are no concerns about ventilation or overheating.

Important: Timed Dry should never be used to compensate for a blocked exhaust vent.

Which Is Better?

For many everyday loads, automatic drying programs help reduce overdrying and unnecessary energy use.

Timed Dry can be useful for specific situations.

Follow the manufacturer's recommendations.

Moisture Sensor Problems: What to Check

The moisture sensor helps the dryer determine how damp the laundry is.

On many models, accessible metal sensor surfaces are located inside the drum.

Their exact location varies.

Possible Symptoms

• The cycle ends before clothes are fully dry.
• Small loads remain damp.
• Automatic cycles produce inconsistent results.
• The dryer ends the cycle at unexpected times.

How to Clean the Sensor

If the owner's manual identifies the sensor as homeowner-accessible:

• Turn off the dryer.
• Allow it to cool.
• Locate the sensor surfaces described in the manual.
• Use the manufacturer's recommended cleaning method.
• Dry the area when instructed.
• Run an appropriate cycle again.

Do not use abrasive tools.

Do not remove internal components to reach sensors.

Can a Dirty Sensor Cause Very Long Cycles?

Depending on the control system and the problem, incorrect sensor readings may affect cycle duration.

However, a cycle taking too long does not prove that the moisture sensor is defective.

Check the lint filter and ventilation first.

Electric vs. Gas Dryers: Troubleshooting Differences

Both electric and gas dryers can take too long because of overloaded drums, dirty lint filters, or poor ventilation.

However, their heating systems are different.

Electric Dryers

Many conventional electric dryers in the United States use an electric heating element.

Electrical power must meet the appliance's specifications.

Possible technical problems include:

• Heating element failure.
• Thermostat problems.
• Thermal cut-off failure.
• Sensor problems.
• Electronic control issues.
• Electrical supply problems.

Gas Dryers

Gas dryer heating depends on a burner and a fuel supply.

Possible components involved include:

• Igniter.
• Flame sensor.
• Gas valve coils.
• Gas valve.
• Thermostats.
• Electronic controls.

Safety

Never remove panels to inspect a heating element or burner.

Do not test high-voltage electrical circuits.

Do not handle gas valves or connections.

If you smell gas, evacuate immediately and contact emergency services and the gas utility from a safe location.

What About Heat Pump Dryers?

Heat pump dryers operate differently from conventional vented dryers.

Many models use lower drying temperatures and do not need an external exhaust duct.

Drying can take longer under certain conditions without indicating a malfunction.

What to Check First

• Selected drying cycle.
• Load size.
• Lint filter.
• Additional filters.
• Accessible condenser or heat exchanger.
• Water collection tank.
• Condensate drainage system.
• Room temperature, according to specifications.
• Error messages.

Does a Heat Pump Dryer Need a Dryer Vent?

Many models do not.

These appliances are called ventless dryers.

Do not attempt to add conventional exhaust ductwork to a dryer that was not designed for it.

When Is Slow Drying a Problem?

A significant decline from the dryer's previous normal performance may indicate a problem, especially if cleaning and maintenance do not improve the results.

Professional diagnosis may be needed for sensors, fans, compressors, or other internal components.

Never open the refrigerant system.

Troubleshooting by Symptom

Risks of a Blocked Dryer Vent

A dryer with a clogged exhaust system may develop problems beyond longer drying times.

Overheating

Insufficient airflow can cause internal temperatures to rise.

Lint Accumulation

Lint may build up inside the exhaust system.

Increased Fire Risk

Lint is combustible.

Accumulated lint combined with excessive heat can contribute to dryer fires.

Higher Energy Consumption

Extended cycles require longer operating time.

Component Wear and Failure

Abnormal temperatures and improper operating conditions can contribute to failures of certain components.

Additional Risks With Gas Dryers

An improperly installed exhaust system may also allow combustion products to enter the home.

Carbon monoxide is odorless.

Maintain CO alarms according to applicable safety recommendations, and never operate a gas dryer with its exhaust disconnected.

If there are signs of a severely blocked vent, correct the problem before using the dryer again.

Safety Precautions

How to Prevent Long Dryer Drying Times

Clean the Lint Filter After Every Load

This is one of the simplest ways to maintain drying performance.

Maintain the Dryer Vent

Inspect the ventilation system periodically and arrange cleaning according to the installation, usage conditions, and owner's manual.

Annual professional vent inspection and cleaning is a commonly recommended preventive practice.

Avoid Overloading

Leave enough room for clothes to tumble.

Separate Fabrics

Dry similarly weighted fabrics together whenever practical.

Check Washer Spin Performance

Clothes with less residual water require less drying time.

Select Appropriate Cycles

Do not automatically use the highest temperature for every load.

Pay Attention to Airflow Warnings

Messages such as Check Vent and Flow Sense should not be ignored.

Maintain Accessible Sensors

Clean user-accessible moisture sensors according to the manufacturer's instructions.

Follow Heat Pump Dryer Maintenance Requirements

Keep approved filters and condensation components clean according to the manual.

How Much Does It Cost to Fix a Dryer That Takes Too Long to Dry?

Repair costs depend on the underlying cause.

Cleaning the lint filter, changing the load size, or choosing the correct cycle may solve the problem without replacing parts.

Other situations may require:

• Professional dryer vent cleaning.
• Correcting the exhaust installation.
• Replacing unsuitable ductwork.
• Heating system repairs.
• Blower repairs.
• Sensor replacement.
• Electronic control diagnosis.
• Gas system service.
• Heat pump dryer repairs.

Before approving service, ask about:

• The service call fee.
• Diagnostic charges.
• The confirmed cause.
• Required replacement parts.
• Labor charges.
• Repair warranty.
• Manufacturer warranty coverage.

If the problem is in the home's exhaust ductwork, you may need a specialized dryer vent contractor rather than only an appliance technician.

Should You Repair or Replace a Dryer That Takes Too Long to Dry?

When to Call a Professional

Contact a qualified professional if:

• Drying remains unusually slow after basic checks.
• The exhaust duct is blocked in an inaccessible area.
• Serious or recurring airflow warnings appear.
• The dryer overheats.
• You notice a burning smell.
• The appliance produces little or no heat.
• The dryer shuts off unexpectedly.
• Error codes persist.
• A blower malfunction is suspected.
• Sensors or electronic controls may be defective.
• The exhaust installation needs correction.
• Diagnosis requires removing internal panels.

Gas combustion and fuel supply problems require a qualified professional.

If a gas leak is suspected, evacuate and contact emergency services.

Frequently Asked Questions

Related Guides

• Dryer Not Heating: Common Causes and What to Check
• Dryer Making a Loud Noise: Common Causes by Sound