A dryer that heats fine but needs two cycles to finish one load is almost always moving too little air. Heat without airflow cannot carry moisture out of the drum, so the clothes stay damp while the cabinet gets hot. Start with the five minute test at the outside vent hood before ordering any part.
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Book a slotIf the dryer still heats but the load comes out damp and the cycle runs long, the problem is almost never the heating element. It is airflow. A dryer dries by pulling room air through the drum, heating it, and pushing it outdoors carrying the moisture it collected. Restrict that path anywhere and the hot wet air stays where it is. VSH Appliance Repair, 6950 Remmet Ave, Canoga Park. Dryer repair across the West Valley, open Sunday 7:00 am to 7:00 pm. Call (818) 325-5525, price is agreed before we start.
Run the dryer heated for five to ten minutes, then put your hand under the exhaust hood outside.
Whirlpool lists this immediately after the lint screen check when clothes are not drying satisfactorily: run the dryer for 5 to 10 minutes and hold your hand under the outside exhaust hood to check air movement. GE Appliances states the same rule from the other direction: if there is not a strong airflow at the wall cap, it is typically an indication that the duct is obstructed.
Strong warm air means the duct is clear and the answer is inside the machine. Weak air means the restriction sits between the drum and the outdoors.
Empty and clean are different states.
The screen should be cleaned after every load. What people miss is the film that builds on the mesh itself. GE says that if a fabric softener or anti-static conditioner is used, the lint filter should be washed periodically with warm soapy water to remove the residue from the filter screen. Hold the screen under a running tap. If water pools on it instead of passing straight through, it is coated, and it has been choking airflow for months.
Whirlpool adds the related cause: use one fabric softener sheet, once, because sheets block the grille. Then check the floor in front of the machine. GE points out that air is drawn in at floor level along the front of the dryer, so a basket against the toe kick starves the intake.
The code gives three methods, and most people have never seen any.
The 2021 International Residential Code, Section M1502 starts with the specified length method in M1502.4.6.1: the exhaust duct is limited to 35 feet from the transition duct connection to the outlet terminal, and fittings come off that total. Table M1502.4.6.1 prices them. A 4 inch radius mitered 90 degree elbow costs 5 feet. A mitered 45 degree elbow costs 2 feet 6 inches. A 6 inch radius smooth 90 degree elbow costs only 1 foot 9 inches, so elbow shape matters as much as elbow count.
The second method, M1502.4.6.2, lets the dryer manufacturer's installation instructions set the limit instead. Whirlpool's chart for one electric dryer allows 64 feet of rigid metal with no elbows into a box or louvered hood, 54 feet with one 90 degree elbow, 44 feet with two, 35 feet with three and 27 feet with four. Swap that box hood for an angled hood and every one of those numbers drops by exactly six feet. Side and bottom exhaust installations already contain a 90 degree turn inside the dryer, so add one elbow before counting the ones you can see.
The third method, M1502.4.6.3, applies when a dryer exhaust duct power ventilator is fitted, and that device's own instructions then set the length. M1502.4.5 separately prohibits domestic booster fans, which people read as a ban on every fan. It is not. A power ventilator listed to UL 705 is permitted under M1502.4.4. A generic inline booster fan off a shelf is not.
Pull it out and look. The material decides the outcome.
The code requires a smooth interior finish, metal not less than 0.0157 inch thick, and 4 inch nominal diameter. Whirlpool is blunter: use heavy metal, never plastic, never metal foil. GE explains why plastic fails: flexible plastic ducting collapses more easily, reduces airflow and can collect water.
Flexible metal is allowed but limited. Whirlpool says the total flexible metal run should not exceed 7 feet 9 inches, fully extended and supported, with the excess removed so it cannot sag or kink, and never inside enclosed walls, ceilings or floors. The short accordion piece connecting dryer to wall is the transition duct, and M1502.4.3 requires a single length listed to UL 2158A, no longer than 8 feet, never concealed inside construction.
Two installation faults show up again and again. The first is a fastener reaching into the duct: the code allows no screw protruding more than an eighth of an inch, and Whirlpool bans any fastener that extends into the interior and catches lint. The second is duct tape, which Whirlpool rules out and tells you to replace with clamps at every joint.
Usually a screen that should not be there, or a flap that stopped moving.
M1502.3 requires the duct to terminate outside, requires a backdraft damper, and states plainly that screens shall not be installed at the duct termination. A mesh screen added to keep insects out is the most reliable way to build a lint mat across the opening. M1502.3.1 requires the terminal passageway to be undiminished, with an open area of at least 12.5 square inches.
Whirlpool adds that the exhaust hood must sit at least 12 inches from the ground or any object in the exhaust path, and that a hood with a magnetic latch should not be used. Watch the flapper while someone runs the dryer. If it is not lifting, either there is no air behind it or it is painted shut.
When the duct is clear and the cycle still runs long, or when the dryer never gets hot in the first place.
Whirlpool electric dryers with a display show an AF code for a low airflow condition. The dryer keeps running with the code present, which is why it gets ignored for a year. If AF persists after the duct has been cleaned and the run length checked, the restriction is inside the machine.
Automatic sensor cycles read moisture through metal bars inside the drum. Fabric softener film insulates those bars, so a wet load reads as dry and the cycle shuts off early, which is precisely what a two cycle load looks like. Wipe them with rubbing alcohol before assuming a control fault. If the drum turns but never heats at all, that is a different fault, covered in the piece on a dryer tumbling without heat.
At the gas line, at the 240 volt connection, and at any test that involves running a gas dryer unvented.
GE describes a diagnostic where you disconnect the vent from the back of the dryer and run a load, with a caution worth quoting in full: "Do not operate a Gas Dryer without the vent. It is possible that carbon monoxide fumes could enter the room from the Dryer." That test is for electric dryers only. Cleaning the duct, washing the lint screen, checking the hood flapper and counting elbows are all owner work. Opening the cabinet to reach a thermal fuse, a thermostat, a blower wheel or a gas valve is not.
One maintenance item closes the loop. GE recommends inspecting and cleaning the exhaust ducting at least once a year, notes that a partially clogged vent lengthens drying time, and says to check from outside that the hood flaps move freely and nothing is nesting in the duct. In a Valley house with a garage laundry and a long run to the exterior wall, once a year is the difference between a dryer that finishes in one cycle and one that quietly takes two.
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Because drying is airflow plus heat, and airflow is the half that fails first. A dryer removes moisture by pulling room air through the drum, heating it, and pushing it outside with the water it picked up. If the lint screen, the duct or the outside hood is restricted, that hot wet air stays in the drum. The clothes come out warm and damp and the cycle runs long. A dryer that does not get hot at all is a different fault.
Run the dryer on a heated timed cycle for five to ten minutes, then go outside and hold your hand under the exhaust hood. Whirlpool gives this as its second troubleshooting check, right after the lint screen. GE Appliances puts it the same way: if there is not a strong airflow at the wall cap, that typically means the duct is obstructed. Strong warm airflow means the duct is clear and the problem is inside the dryer.
The International Residential Code gives three methods. Under the specified length method the exhaust duct is limited to 35 feet from the transition duct connection to the outlet terminal, and fittings subtract from that: a 4 inch radius mitered 90 degree elbow counts as 5 feet, a mitered 45 degree elbow as 2 feet 6 inches. The second method lets the dryer manufacturer's installation instructions set the limit instead, which is why one Whirlpool electric dryer chart allows 64 feet of rigid metal with no elbows and a box or louvered hood. The third applies only when a listed dryer exhaust duct power ventilator is fitted.