The short answer first
A KTN dryer that will not finish is either being told to stop or protecting itself. Start with moisture sensor bars coated with softener film, then check the air path — those two account for nearly every version of this complaint.
Symptoms, including the misleading ones
- Small loads dry fine but large ones do not — A load that cannot tumble cannot present wet fabric to the sensors, so the machine samples the dry outside of the ball.
- The display counts down and then jumps to the end — Automatic cycles estimate the remaining time from the sensors, so a jump is the sensors changing their mind.
- It stops partway through and will not restart until it cools — A thermal device cutting out, which means heat is building because air is not leaving.
- NEAR MISS — the machine will not start at all — A dryer that never begins is a no-start fault, and a different page ranks the door switch, the supply and the belt.
The causes in order of likelihood
- Moisture sensor bars coated with softener film — The result is a machine that behaves perfectly and stops in minutes, because it has been given the wrong information rather than because anything has failed. It heads the list because it is the failure this class shows first, and the one an owner can settle without opening anything. With a badge like this the practical question behind every check is whether the fix needs a part at all, so the no-part causes are ranked first.
- Wrong cycle selected for the load — It belongs on the list because it is free, immediate, and because a change of habit fixes it permanently. Second, and the last of the causes that a careful look will settle on its own.
- A drum too full to tumble properly — A dryer works by tumbling wet fabric through hot air. An overfilled drum cannot tumble, so the outside of the mass dries and the inside stays soaked — and the sensors, which only touch the outside, call the load dry. Third, because the evidence for it only means something once the two above are ruled out.
- Airflow so poor the cycle never reaches an end — A partly blocked duct also extends automatic cycles indefinitely, because the load never actually dries and the machine keeps trying until a timer or a thermostat ends it. Last: it accounts for the smallest share of these calls, and every check above it is quicker to make.
The order to check in
- Find the two metal strips inside the drum and look at them closely — A dull or waxy surface rather than bright metal is the fault, and it is visible with a torch. Start here — it is free, and it decides which half of the list you are in.
- Note which cycle was actually selected and what its heat setting is — A low-heat setting on towels produces exactly this complaint with nothing wrong. Second, and still no tools beyond a torch.
- Run the same fault with a half load and compare — A machine that completes a small load properly is a machine that is working. Only worth doing once the two above are ruled out.
The steps, with tools and times
- Cut back on dryer sheets and liquid softener for a few loads — The film comes back if the habit does, which is why the fix includes a change of routine.
About 10 min
- Use a timed cycle for bulky items and sensor cycles for everyday loads — That habit removes most of this complaint without touching the machine.
About 10 min
- Dry heavy single items alone and pause to redistribute them — A duvet needs space and a shake partway through, whatever the cycle claims.
About 20 min
- STOP before testing anything electrical with the power on — The checks above are all done cold. A test that needs power applied is a technician test, whatever a video shows.
The safety part
Safety
Power off at the breaker first; the heating circuit in an electric dryer runs at a voltage that does not forgive mistakes. Move the machine with two people rather than walking it on its feet, and check the duct is not crushed when it goes back.
When to call a technician
Call once the sensors are clean, the duct is clear, the load is reasonable and a timed cycle still will not complete. At that point the temperature sensing or the control is the suspect, and both need a meter rather than a cloth.
Related KTN pages
What this page leaves out
Generalized information. It applies across KTN dryers rather than to one line, and where a more specific page exists it is the better answer for your unit. Not covered here: service-manual procedures, fastener sizes and any figure that changes between families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
