The short answer
A cycle that stops early or never advances on the FDE line is usually the machine protecting itself or mis-sensing the load, not a failed control. On this page the load and the moisture sensor come first, because an automatic cycle stops on a reading, and the reading is easy to spoil. An automatic cycle ends on dryness, not on time, so a load that keeps coming out damp after two minutes of tumbling is a sensing or airflow story.
What you are seeing on the FDE line
- The machine stops mid-cycle and restarts when it cools — A thermal cut-out is opening. Almost always restricted airflow rather than a faulty part.
- The timer never seems to move on an automatic cycle — Automatic timers only advance once the load is drying, so a slow cycle points at airflow or heat.
- NEAR MISS — the drum turns but there is no heat at all — Then this is a heating fault rather than a cycle fault, and the checks are different: element, fuse and gas valve rather than sensing and venting.
Causes, most likely first on the FDE line
- The load is too big, too mixed or too wet — Ranked first because it costs nothing and explains most complaints: a drum packed tight cannot tumble, and a load that arrives soaking from a washer that did not spin will defeat any dryer.
- The moisture sensor is coated or mis-reading — Wiped clean with a little vinegar, sensor bars usually recover. The fault looks like a broken timer and is neither electronic nor expensive.
- The vent run is restricted or blocked — Lint accumulates along the duct and at the outside hood. The machine cools itself with airflow, so when airflow drops the cut-outs start to open.
- The door switch is intermittent — Last, and quick to test: press the door firmly during a cycle and see whether the machine changes its mind.
Check in this order, and why that order
- First — run a small single-fabric load on a timed cycle — Timed drying bypasses the sensing entirely. If a small load dries on time, the machine is healthy and the problem is sensing or loading.
- Then — wipe the moisture sensor bars inside the drum — A little vinegar on a cloth removes softener film. Coated bars read a wet load as dry and stop the cycle in minutes.
- Only then — disconnect the vent at the machine and look at the duct and the outside hood — Air should leave the hood strongly with the machine running. A lint-packed duct makes the machine run long and trip hot.
- STOP here if the next check needs a panel off or a meter on live terminals — Everything above can be done with nothing dismantled; past it the checks need test equipment.
Before you open anything
Safety
Unplug the dryer or switch off its breaker before any panel comes off — a capacitor can hold a charge after the power is off, and the heater terminals stay live whenever the machine is connected. If yours is a gas model and you smell gas: do not switch anything on or off, leave the building, and call the gas utility or emergency services from outside; do not look for the leak yourself. Never run the machine with the vent disconnected into the room, and never bypass a thermal cut-out to get a load finished.
Where the owner job ends
Call when the vent is clear, the sensor is clean and a timed cycle still fails, because the next checks are continuity on the thermostats and the door switch. On the FDE line, call rather than continue if the rear panel has to come off. Call immediately if there is a burning smell, a scorched load or a machine that keeps tripping its cut-out after the duct has been cleared — repeated overheating is how dryer fires start.
Other faults covered for the FDE line
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
