The short answer
Split this fault first: does the cycle end too soon, or never end at all? On a dryer whose type decides the ranking: vented, condenser or heat-pump, and gas or electric those point in opposite directions, one at sensing and the other at airflow.
What you are actually seeing
- The cycle ends after a few minutes with a damp load — Classic sensing fault: the machine believes the load is dry.
- The cycle runs and runs and never completes — Moisture is not leaving. Look at airflow, the tank or the duct rather than at the control.
- The display counts down and then adds time back — Normal on many machines, which estimate rather than count. It becomes a fault only when the estimate never converges.
- The machine pauses mid-cycle and waits — A cut-out cooling down, a door switch losing contact, or a tank sensor asking to be emptied.
- Timed cycles work but automatic ones do not — That single comparison isolates the sensing path and is the most useful test on this page.
- Not this fault: nothing happens at all when you press start — That is a no-start, and it belongs on its own page.
Causes, most likely first on this machine
- Moisture sensor bars coated with softener residue — First, and easily cleaned: a film across the bars reads as dry clothes, which is why the cycle ends early on a load that is plainly wet.
- Restricted airflow, or a full condensate tank — Second: a blocked duct or filter keeps moisture in the cabinet, so the cycle never satisfies its own end condition.
- The wrong cycle or option for the load — Third, and free: a delicate or low-heat cycle on a heavy load behaves exactly like a machine that will not finish, and an anti-crease option keeps a finished machine tumbling.
- Overloading — Fourth: clothes that cannot tumble do not present themselves to the sensor bars, so the machine samples the same few items and finishes early.
- A thermistor or cycling thermostat drifting — Fifth: it skews the temperature the control is working from, which shortens or lengthens cycles without any other symptom.
- The control board — Last: reachable only by elimination, and the most expensive part on the list. It should never be the first thing replaced.
Check in this order, and why
- Run the same load on a timed cycle — If it dries, the heating is fine and the fault is in sensing — that is half the diagnosis for the cost of one cycle.
- Wipe the sensor bars inside the drum — Free, and the single most productive action on this page.
- Check the filter, the duct or the condensate tank — Whichever your machine has. A cycle that never ends is nearly always this.
- Reduce the load and repeat — Two smaller loads dry faster than one overloaded drum, and the test costs nothing.
- Only then consider sensors, thermostats and the control — They need a meter, and they are the least likely causes here.
What an owner can safely check
- Clean the moisture sensor bars — Fine abrasive pad or a cloth with a little white vinegar, then dry. They are the two metal strips inside the drum near the filter opening.
Tools: cloth, white vinegarAbout 15 min
- Clean the lint filter and housing — Wash a glazed filter and vacuum the housing beneath it. Both feed directly into how the cycle behaves.
Tools: vacuum, warm waterAbout 20 min
- Check the duct and the outside flap — A crushed duct or a flap held shut by lint stops moist air leaving, and that is the cause behind most endless cycles.
Tools: screwdriverAbout 30 min
- Run a comparison cycle and note the difference — Same load, timed versus automatic. Write down what each did; that is the evidence a technician needs.
About 60 min
- Stop here if the next step is testing a thermistor or a board — Both are inside the cabinet at line potential.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Do not use abrasive chemicals on sensor bars, and do not run a cycle with a panel removed to watch what happens. Clear the lint path before extending cycle times to compensate for poor drying: running longer against a restriction is the condition that starts dryer fires. On a gas machine, if you smell gas, leave the building and call the utility or the emergency services from outside.
When to call a technician
Call when the timed-versus-automatic comparison shows both failing, which points past sensing to heat or airflow, and when a clean sensor and a clear duct leave the fault unchanged. Call sooner if cycles end with a burning smell, if the machine becomes hot to the touch on the cabinet, or if it stops and will not restart until it has cooled — that is a cut-out cycling, and it is an airflow problem that wants attention now rather than later.
Sources
Documented- 29 CFR 1910.147 — The control of hazardous energy (lockout/tagout) — osha.gov, fetched 2026-09-12
- U.S. Consumer Product Safety Commission — product safety and recall notices — cpsc.gov, fetched 2026-09-12
Nearest pages of this class
What this page does not cover
This page covers the appliance class under this nameplate and not one family or model. Cycle logic, sensor placement, thermistor curves and part numbers differ by platform and belong on the model-specific page linked below where one exists. Detergent and softener chemistry is outside its scope.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
