Why Your Dryer Takes Two Cycles Now (And the One Thing That Usually Fixes It)

It happened gradually. At some point in the last year or two, one dryer cycle stopped being enough. You started running it twice — not because the first cycle failed completely, but because the clothes came out damp enough that a second run felt necessary. You adjusted. It became the new normal.

Here's what's actually happening, and why it matters more than the extra 45 minutes of electricity you're spending every laundry day.

The Most Common Cause: The Vent

Before anything else — before heating elements, motors, or thermostats — the dryer vent is almost always the first thing a technician checks when a dryer is taking too long. And in the majority of St. Charles County service calls, it's also where the problem is found.

A dryer works by pulling air in, heating it, tumbling it through wet clothes, and then exhausting that moisture-laden air out through a duct to the exterior of the house. When that exhaust duct is partially or fully blocked, the dryer can't move air through efficiently. Warm, humid air lingers inside the drum. Drying times double. The clothes come out warm but damp — they've been tumbling in an increasingly humid environment rather than a dry one.

What causes vent blockages in St. Charles County homes:

• Lint accumulation. The lint trap catches most fibers, but not all. Over time, lint builds up inside the duct — particularly at bends and at the exterior vent cap. A duct that hasn't been professionally cleaned in three or more years is likely partially restricted.
• Crushed or kinked flexible duct. Many dryers are connected to the wall duct with a short section of flexible aluminum duct. If the dryer was pushed back against the wall without accounting for the duct, that section can be severely kinked — reducing airflow by 50 percent or more.
• A stuck or clogged exterior vent cap. The flap on the exterior of the house that opens when the dryer runs can stick shut from lint buildup, paint, or pest nesting. A cap that's 70 percent blocked from the outside creates the same symptom as a blocked duct from the inside.
• Bird or pest nesting. Exterior vent caps are attractive nesting spots for starlings and sparrows. A nest inside the duct restricts airflow and creates a fire hazard — dried lint and nesting material in a warm, enclosed duct is a genuine risk.

A clogged dryer vent isn't just an efficiency problem. It's a fire hazard. The National Fire Protection Association identifies dryer vents as a leading cause of home structure fires, with failure to clean the duct as the primary contributing factor. A dryer that's working harder than it should because it can't exhaust properly is also running hotter than it should — which accelerates wear on every other component.

When the Vent Is Clear and the Problem Persists

If the vent is clear and the dryer still isn't drying effectively, the next candidates are inside the machine itself.

Heating element failure (electric dryers). Electric dryers use a coiled heating element to generate heat. Elements fail in two ways: complete failure (the dryer tumbles but produces no heat at all) and partial failure (one section of the coil breaks while others remain functional, reducing heat output significantly). A dryer that runs warm but not hot, and takes two cycles, often has a partially failed element.

Gas valve or igniter issues (gas dryers). Gas dryers rely on a functioning igniter to light the burner and a set of gas valve coils to keep it open during the cycle. Both components wear out over time. The symptom is similar to a partial heating element failure — the dryer gets warm, sometimes even hot, but cycles off the heat too frequently to dry efficiently.

Cycling thermostat failure. The cycling thermostat regulates the dryer's internal temperature, cycling the heat on and off to maintain the set range. A thermostat reading low causes the heater to shut off before the drum gets hot enough, which extends drying time significantly. A thermostat reading high causes it to run too hot — clothes get done, but fabrics take damage and the dryer itself is at risk.

Moisture sensor malfunction. Most dryers built in the last 15 years use a moisture sensor — two metal bars inside the drum that measure conductivity of the load. As clothes dry, conductivity drops, and the sensor tells the dryer to end the cycle or shut off. Sensors coated with fabric softener residue read "dry" too early, ending cycles before the load actually is. Cleaning the sensor bars with rubbing alcohol costs nothing and occasionally solves the problem entirely.

Repair vs. Replace: The Math on Dryers

Dryers have a simpler mechanical design than most major appliances. There aren't many moving parts, and the components that fail — heating elements, thermostats, igniters, belts — are typically inexpensive and straightforward to replace. A dryer that's 5 to 8 years old and otherwise functioning is almost always worth repairing if the problem is one of those components.

The calculation shifts when the dryer is over 12 years old and has already had repairs, or when the drum bearings are worn (indicated by loud rumbling or grinding during tumbling) and the heating system is also failing. At that point, you're looking at repairs that together approach the cost of a new unit — and the new unit comes with a warranty.

For an honest assessment of whether repair or replacement makes sense for your dryer, AAA Home Services handles appliance repair throughout O'Fallon and the surrounding St. Charles County area. Our technicians do not work on commission — many home service companies structure technician pay in ways that create pressure to recommend replacement. Ours don't. If a $90 part fixes your dryer, that's what you'll hear.

What About the Dryer Vent Itself?

Dryer vent cleaning is something most homeowners in St. Charles County haven't done — or haven't done recently enough. The recommendation is once per year for average-use households, more frequently for large families doing daily laundry. If your home has a long duct run (more than 10 feet) or multiple bends, annual cleaning is particularly important because lint accumulates faster at every turn.

If you're not sure when the duct was last cleaned, or if your dryer has been underperforming for months, it's a reasonable first step before calling about a component repair. Vent cleaning and a service call can often be combined into one visit.

Call (636) 397-3200 or reach us online to schedule a dryer inspection or appliance repair visit. Most dryer issues are diagnosed and repaired in a single trip — no waiting weeks for parts on the common failures.

Frequently Asked Questions

How often should a dryer vent be cleaned in St. Charles County?

Once per year for most households. If you do laundry daily, have a large family, or your duct run is longer than 10 feet with multiple bends, twice per year is worth considering. Signs that it's overdue: the dryer takes longer than it used to, clothes are unusually hot when the cycle ends, or you notice a burning smell during operation.

Can I clean the dryer vent myself?

The lint trap and the first few feet of duct behind the dryer, yes. A full duct cleaning from the dryer connection to the exterior vent cap typically requires a dryer vent cleaning kit or a professional with the right brushes for longer runs. Attempting to clean a long or complicated duct with a shop vacuum and a short brush often pushes lint further in rather than out.

How long should a dryer last?

A well-maintained dryer typically lasts 10 to 13 years. Dryers that are consistently used with clean vents and have minor component repairs as needed can run to 15 years. Dryers that run with restricted vents age faster — the motor, heating element, and drum bearings all take more stress when the machine is working against a blocked exhaust.

Is it worth repairing a dryer that's 10 years old?

Usually yes, if the repair is a single component — a heating element, thermostat, igniter, or belt. These parts are inexpensive relative to the cost of a new unit, and a 10-year-old dryer still has useful life remaining if the drum and motor are sound. If the drum bearings are going and the heating system is also failing, the calculus changes.

Why does my dryer run but produce no heat at all?

Complete heat failure on an electric dryer is almost always a blown thermal fuse or a fully failed heating element. On a gas dryer, it's typically an igniter that's stopped working or gas valve coils that have failed. Both are repairable in a single service call in most cases. The thermal fuse, in particular, is inexpensive — though if it's blown, determining why (usually a restricted vent) is important before replacing it, or it will blow again.

What's the moisture sensor on a dryer and how do I clean it?

The moisture sensor is typically two narrow metal strips inside the front of the drum, near the lint trap. They measure how much moisture is in the load by electrical conductivity. Fabric softener and dryer sheet residue coat these strips over time, causing the sensor to read "dry" when the clothes aren't fully dry. Wipe both strips with a cloth dampened with rubbing alcohol, let them dry completely, and run a test load. It takes about two minutes and occasionally resolves erratic drying behavior entirely.