Why Is My LG Dryer Showing the AF Error?

If your LG dryer displays the AF error code, it usually means the appliance is detecting restricted airflow.

The dryer relies on proper airflow to remove hot, moist air during the drying cycle. When airflow becomes blocked, the machine may stop working efficiently and display the AF code as a warning.

In many cases, the problem is caused by lint buildup or a clogged vent system.

Quick Answer

LG Dryer AF Error Code Meaning

The AF code stands for:

Air Flow Problem

Your dryer has detected poor ventilation or restricted exhaust airflow.

This issue can lead to:

• Longer drying times

• Overheating

• Reduced dryer performance

• Increased energy usage

Common Signs That Appear With the AF Error

Users often notice these symptoms before or during the AF code:

• Clothes take too long to dry

• Dryer feels extremely hot

• Laundry remains damp after one cycle

• Dryer shuts off early

• Burning smell from lint buildup

• Excess heat in the laundry room

Most Common Causes of the AF Error

Clogged Dryer Vent

Lint buildup inside the exhaust duct is the number one cause of airflow problems.

Over time, lint blocks hot air from escaping properly.

Dirty Lint Filter

A full lint screen restricts airflow immediately.

Even a thin layer of lint can reduce dryer efficiency.

Crushed or Bent Vent Hose

The flexible vent hose behind the dryer can become pinched against the wall.

This prevents proper air circulation.

Blocked Exterior Vent

The outdoor exhaust vent may become blocked by:

• Lint

• Dirt

• Bird nests

• Leaves

• Snow or debris

Overloaded Dryer

Large loads reduce airflow inside the drum and can trigger airflow warnings.

How to Fix LG Dryer Error Code AF

1. Clean the Lint Filter

Start with the simplest step.

What to Do

• Remove the lint filter

• Clean off all lint

• Reinstall the filter securely

This should be done after every load.

2. Inspect the Dryer Vent Hose

Pull the dryer slightly away from the wall.

Check whether the vent hose is:

• Bent

• Crushed

• Twisted

• Packed with lint

Straighten the hose if needed.

3. Clean the Entire Vent System

Disconnect the vent hose and clean the duct thoroughly.

You may need:

• A vacuum

• Dryer vent brush

• Compressed air tool

Clean both:

• Indoor vent duct

• Outdoor exhaust vent

4. Check the Outside Vent Opening

Go outside and inspect the dryer vent cover.

Make sure it opens freely when the dryer runs.

Remove any debris blocking airflow.

5. Reset the Dryer

After cleaning the airflow system, reset the dryer.

Reset Instructions

1. Turn the dryer off

2. Unplug it for 5 minutes

3. Plug it back in

4. Restart the cycle

The AF code may clear automatically.

6. Reduce Load Size

Avoid stuffing too many clothes into the dryer.

Smaller loads allow better airflow and faster drying.

Why the AF Error Should Not Be Ignored

Restricted airflow can create serious problems over time.

Possible risks include:

• Overheating

• Damage to heating components

• Higher electric bills

• Dryer failure

• Fire hazards caused by lint buildup

Cleaning the vent system regularly helps prevent these issues.

How Often Should Dryer Vents Be Cleaned?

Most experts recommend:

• Cleaning the lint filter after every load

• Inspecting the vent hose monthly

• Deep cleaning the vent system every 6–12 months

Homes with heavy dryer usage may need more frequent cleaning.

Can the AF Error Go Away by Itself?

Sometimes.

If airflow temporarily improves, the dryer may stop showing the error. However, the underlying blockage usually remains.

Ignoring the warning can eventually lead to bigger repair problems.

When to Call a Technician

Professional help may be needed if:

• The AF code keeps returning

• Airflow seems normal but the error persists

• The dryer overheats frequently

• Internal airflow sensors are faulty

• Vent cleaning does not solve the issue

A technician can inspect internal components and airflow sensors safely.

Tips to Prevent the AF Error

Clean the Lint Trap Constantly

Never run the dryer with a dirty filter.

Avoid Long or Twisted Vent Hoses

Shorter and straighter vent systems improve airflow dramatically.

Use Proper Vent Materials

Rigid or semi-rigid metal ducts work better than plastic hoses.

Keep the Laundry Area Ventilated

Good room airflow helps the dryer operate efficiently.

Final Thoughts

The LG dryer AF error code is usually caused by poor airflow or blocked ventilation.

Fortunately, most AF issues can be fixed by cleaning the lint filter, vent hose, and exhaust system. Regular maintenance not only prevents error codes but also improves dryer performance and safety.

Keeping your dryer vent system clean is one of the easiest ways to extend the life of your appliance.

Read More:

Dryer clothes still damp? Causes and fixes

LG dryer not drying - Causes and simple fixes

Why is your dryer taking too long to dry?

How to reset an electric dryer quickly and safely