The answer first
When a dryer stops drying properly the fault is almost always moisture removal rather than heat production: the machine is making heat and the wet air is not leaving. That is why the vent path dominates the ranking below. 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
- Loads need a second or third cycle to finish — The machine is working and the water is not going anywhere. That is airflow, not heat.
- Items are hot but still damp at the end — Heat with no moisture removal — the clearest possible restriction signature.
- Thick items stay wet while thin ones are bone dry — Overloading, or a load too mixed for the sensor to judge.
- The room gets humid while the machine runs — Moist air is escaping into the room rather than going down the duct — a disconnected or split vent.
- NEAR MISS — nothing is warm at all — No heat at all is a heating fault, and the diagnosis starts in a different place.
Ranked causes on this platform
- Restricted or leaking vent duct — First, and it covers most complaints in this class. A duct that is half-blocked still lets the machine heat, so the owner sees a drying problem rather than a heating one, and the machine quietly gets hotter while doing less work.
- Overloading — Second. A packed drum stops clothes tumbling through the airstream, so the outside of the load dries and the middle does not. Compact drums reach that point with a load that looks reasonable.
- Moisture sensor coated with residue — Third. Fabric-softener film on the sensor bars makes the machine read the load as dry early, which ends the cycle before the clothes are done.
- Lint screen fitted wrong or damaged — Fourth, and easy to overlook: a torn screen lets lint into the duct, and a screen not seated lets it bypass entirely, both of which accelerate the first cause.
Check in this order, and why
- Feel the exhaust outside while a cycle runs — Strong warm flow means the path is good and the problem is the load or the sensor. Weak flow makes the duct the answer.
- Dry a small, uniform load and compare — A half load of similar items removes both the overloading and the mixed-load variables in one test.
- Wipe the sensor bars inside the drum — They are usually two metal strips near the lint opening. Cleaning them costs a minute and fixes a real share of early-stopping cycles.
Step by step, within the safe boundary
- Clean the lint screen every load and the housing monthly — The screen is the first restriction and the housing behind it is the second. Vacuum the slot rather than just the mesh.
Tools: vacuumAbout 10 min
- Clear the duct from the machine to the outside — Disconnect it, brush and vacuum both directions, and pay attention to the first elbow behind the machine.
Tools: vacuum, duct brushAbout 45 min
- Wipe the moisture sensor bars with a little vinegar — Remove the softener film so the sensor reads the load rather than the coating.
Tools: cloth, white vinegarAbout 10 min
- Dry loads of similar weight rather than mixed — Towels with shirts means one of them is wrong at the end. Sorting by weight fixes more than any setting change.
About 5 min
- STOP before replacing sensors or thermostats — Those are inside the cabinet and on the mains side.
Power, water and the limits of owner work
Safety
Unplug the machine or switch off its breaker before opening the cabinet — the heater circuit on this class of appliance carries real current and the terminals are exposed once a panel is off. Clean lint out with a vacuum, never with a blast of compressed air into the cabinet, and put every ducting section back the way it came off.
When to call a technician
Almost everything in this category is owner-side maintenance, and doing it properly usually removes the complaint. Book a visit when the airflow is provably good and the machine still will not finish a load, and treat a machine that is hot to the touch as urgent rather than annoying: heat that stays in the cabinet is the beginning of the fire risk, not just an inconvenience.
Nearby pages
What is deliberately left out
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.
