Maytag Dryer Error Code F31 — What It Means & How to Fix It

What Does This Error Mean?

F31 means your Maytag dryer has detected restricted airflow in the external exhaust path — the duct that runs from the back of the dryer through the wall to outside. While F30 typically points to an internal blockage like a clogged lint filter, F31 points to the external side: a blocked exterior vent cap, a crushed wall duct, or a duct run that is too long or has too many bends. This is a fire hazard — clear the blockage before running another load.

Affected Models

Maytag MEDB835DW
Maytag MEDC215EW
Maytag MED5500FW
Maytag Bravos Dryer

Common Causes

Exterior vent cap on the outside of the house is blocked by lint, bird nest, or debris
Rigid or flexible exhaust duct inside the wall is crushed, collapsed, or kinked
Duct run is too long (over 25 feet) or has too many bends, creating excessive airflow resistance
Flexible foil or plastic duct has sagged and is trapping lint in low sections
Exhaust duct has accumulated a thick layer of lint over years of use

How to Fix It

Stop the dryer and do not run it again until the external vent is cleared.

F31 indicates a fire hazard. A blocked vent can cause lint to ignite inside the duct.
Go outside and locate the exterior vent cap. Remove any visible lint, debris, bird nests, or ice (in cold climates) blocking the flap.

The vent cap flap should swing open freely when you push it by hand. If it is stuck, pry it open carefully and clear the blockage.
Pull the dryer away from the wall and inspect the flexible duct connecting the dryer to the wall outlet. Look for kinks, crushing, or sagging.

Replace any plastic accordion duct with rigid or semi-rigid metal duct. Plastic ducts trap lint and collapse over time.
If the duct and exterior cap look clear, the problem may be inside the wall. Use a dryer duct cleaning brush kit to clean the full length of the duct.

Brush kits can be found at hardware stores and typically reach duct runs up to 25 feet.
Verify the total duct run length. Each 90-degree bend counts as 5 feet of equivalent length — the total should not exceed 25 feet.

If the duct run is too long, a booster fan or duct reroute may be needed — a contractor can advise.

When to Call a Professional

If you cannot access the exterior vent cap to clean it, or if the duct runs through the wall and cannot be cleared from either end, a technician or duct cleaning service should be called. If F31 returns quickly after cleaning, a duct cleaning service can clear accumulated lint buildup from inside the wall section.

Frequently Asked Questions

What is the difference between F30 and F31?

F30 typically points to an internal blockage — a clogged lint filter or duct immediately behind the machine. F31 points to the external exhaust path — the duct running through the wall and the exterior vent cap. Both are airflow restrictions and both are fire hazards.

How often should dryer ducts be cleaned?

Dryer duct cleaning is recommended every 1 to 2 years for typical household use. If you run large or frequent loads (families with children, frequent bedding washes), clean the duct annually.

Can I use a leaf blower to clear the duct?

Yes, blowing air from the dryer end toward the exterior vent can dislodge blockages. However, a proper brush kit is more effective at removing lint that is stuck to duct walls rather than just sitting loose in the duct.