The short answer
A Aviva ALFD that stops early, runs endlessly or shuts itself down mid-cycle is almost always reporting airflow. A dryer is an air machine before it is a heat machine, so the vent belongs at the top of almost every list it appears on. A machine that cannot exhaust overheats, its protective thermostats open, and the cycle behaves exactly like a control fault while the control is perfectly healthy.
What you observe on these models
- It stops after a few minutes with the load still wet — An auto-dry programme deciding the load is dry.
- It shuts down and restarts only after cooling — A thermal device opening on temperature.
- The cycle stops if the door is knocked — The door switch, which is a mechanical part that wears and then fails intermittently.
- Timed cycles work but automatic ones do not — That is a clean separation: the timer is fine and the sensing path is not.
- NEAR MISS — it runs the full cycle and the clothes are still wet, with no heat at all — That is a heating fault rather than a cycle fault.
Causes, most likely first on ALFD
- A restricted vent — This is first on any dryer cycle complaint. A machine that cannot exhaust cycles its thermostats, runs long, stops early or shuts down — all of which read as a control fault and none of which is. Ranked first on Aviva ALFD because a dryer is an air machine before it is a heat machine, so the vent sits at the top of almost every list it appears on.
- The moisture sensor or the auto-dry program — Sensor bars that are coated in softener residue read a dry load as dry before it is, and the cycle ends early with damp clothes.
- The door switch — A switch that opens intermittently stops the cycle without an error, and the machine restarts happily when the door is pushed.
- The thermostats and the thermal fuse — A chain of protective devices that shut the heat down when air cannot carry it away. They are consequences far more often than causes.
- The timer or control board — Last on the list, and only after the vent has actually been proven clear at the outside outlet rather than assumed. Last on this list, and the item that every cause above it can imitate exactly.
Check in this order, and why that order
- Prove the air path before anything else — Clear the lint filter and then check that air is actually leaving the vent outside, because almost every heat complaint on a dryer begins there. Hold a hand at the outside outlet during a cycle: weak or no flow there is the diagnosis, whatever the machine is displaying.
- Wipe the moisture sensor bars inside the drum — Softener residue insulates the bars and makes a wet load read as dry. A cloth and a little vinegar is the whole repair.
- Run a timed cycle as a control test — If a timed cycle completes normally, the heat and the airflow are adequate and the fault is in the sensing path.
- Check the door switch by running with a firm press on the door — A cycle that survives only while the door is pressed has named the part.
Before you open anything
Safety
Unplug the dryer or switch off its breaker before removing any panel. If your model is a gas dryer and you smell gas: do not switch anything on or off, leave the building, and call the gas utility or 911 from outside — do not look for the leak yourself. A dryer that runs hot with a restricted vent is a fire risk, not merely an inconvenience: lint is fuel and the restriction is what supplies the heat.
Models this page covers — the ALFD family
Reference| Model number | Family key |
|---|---|
| ALFD2780W | aviva:dryer:alfd |
When to call a technician
Call when the vent is proven clear at the outside outlet, the filter is clean, the sensor bars are clean and a timed cycle still misbehaves. Call immediately if the machine smells hot, if the cabinet is too hot to touch, or if it has tripped protection. On Aviva ALFD the vent explains the majority of these reports, and it is the one thing a technician will check before anything else. One more thing that is specific to this family: the ALFD variant table on this page is the whole of what is covered here — a single model number and nothing else. If the plate on your machine is not one of them, the ranking above was not written for it.
Other problems covered for the ALFD family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
