What this usually is
The programme on a dryer is short and simple, so when it misbehaves the causes are few: the sensor that decides when the load is dry, the thermostats that police the heat, and the door switch that can end a cycle silently. On a Aviva dryer the order below is what makes this page worth reading — the causes are ranked for this kind of machine, not listed alphabetically.
What owners actually report
- The cycle ends far too early with the load still wet — A dryness reading arrived before the load was actually dry.
- The machine runs indefinitely without finishing — The opposite error: the reading never reaches dry, often because there is no airflow to change it.
- It stops mid-cycle and restarts when the door is opened and closed — A door switch making and breaking intermittently, which halts the machine silently every time it does.
- The cool-down phase is skipped — That points at the timer or the control rather than at the sensors.
- NEAR MISS — the machine never begins at all — That is a no-start, and it starts with the door switch and the supply rather than with the programme.
Causes in order of likelihood
- Moisture sensing misread — First. Softener film, an unusually small load or a single synthetic item all fool the sensor, and a fooled sensor ends the cycle in whichever direction the error runs.
- Airflow restriction driving thermal cut-outs — Second, and it explains the mid-cycle stops that come back after a cool-down: a thermostat opens on temperature, the machine stops, the machine cools, and it runs again for a while.
- Door switch intermittence — Third. A worn actuator makes and breaks with drum vibration, which pauses the machine at apparently random points.
- Timer or control fault — Last. A mechanical timer that sticks at one position, or a control that does not advance, gives a repeatable stall at exactly the same place every time — which is what distinguishes it from the causes above.
Working through it
- Run a timed cycle with a normal load — If the timed programme completes properly, the moisture sensing is the fault and nothing else needs investigating.
- Check whether stops follow a hot period — A stop after the machine has been running hot, which clears once it cools, is a thermal answer.
- Press the door firmly against the frame mid-cycle — If the machine stumbles or recovers as you do, the switch is intermittent.
The checks worth doing
- Clean the sensor bars inside the drum — A minute with a cloth and a little vinegar removes the film that causes most early stops.
Tools: cloth, white vinegarAbout 10 min
- Clear the lint screen, housing and duct — This addresses the thermal cause and improves everything else at the same time.
Tools: vacuum, duct brushAbout 45 min
- Compare a timed cycle against an automatic one — Two cycles, one observation: which of them completes tells you which subsystem is at fault.
About 60 min
- Dry a properly sized load of similar items — Very small loads and single items genuinely confuse moisture sensing on most machines.
About 40 min
- STOP before testing the door switch or the thermostats — Both are inside the cabinet on live circuits.
Safety first
Safety
Switch the circuit off and unplug where you can reach the plug. This appliance combines heat, a large motor and flammable lint, which is why the safety step here is physical as well as electrical: clear the vent path, check the outdoor flap opens, and never restart a machine that smells scorched.
The line between a fix and a call
Book a visit when a timed cycle fails in the same way as an automatic one and the duct is clear, because that rules out both the sensing and the airflow and leaves the switches, the thermostats and the timer. Tell the technician whether the stops follow a hot period — thermal stops and electrical stops look identical from the front but they are found in different parts of the machine.
Related pages for this machine
Where this page stops
This is the generalized entry for Aviva dryer units. It deliberately does not carry model-level data, because model-level data is the part that goes wrong when it is copied between families: measured values, replacement part numbers and disassembly sequences. Where the more specific page exists, it is linked and it is the one to use; where it does not, what is here is written to stay true anyway.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
