The quick verdict
An Ariston dryer that tumbles cold has usually broken its thermal chain: a cut-out opened after an overheat, or an element failed open. The overheat almost always had an airflow cause, so clearing the lint path is part of the repair rather than a preliminary. On gas models, no ignition means a registered engineer from the outset.
What the machine is doing
- Drum turns, clothes stay cold and wet — No heat at all, and the definitive presentation.
- Heated until recently, then stopped — A thermal device opening rather than a gradual decline.
- Heats briefly then runs cold — A thermostat cycling early, usually because of restricted airflow.
- No ignition sound on a gas model — Burner or igniter, and specialist work.
- NEAR MISS: an air-dry or refresh programme selected — Some cycles tumble without heat by design.
Where the fault usually sits
- Thermal cut-out opened — First, and it always points behind itself at an airflow restriction that is still present.
- Restricted lint path — Second as a diagnosis and first as a root cause.
- Element failed open — Third on electric machines, and a clean permanent failure.
- Burner or igniter fault — Third on gas machines, and never an owner job.
- Thermostat or control not calling — Last, and confirmed only by measurement.
A sequence that saves time
- Confirm the programme actually asks for heat — Free, and it explains a real share of these.
- Wash the lint filter and check the vent airflow — It addresses the cause behind most cut-outs.
- Feel whether the machine warms at all — Slight warmth points at a thermostat, complete cold at an element or cut-out.
- Stop before the electrical chain — Cut-outs and elements are measured on an isolated machine.
Owner-side checks, step by step
- Select a full heat programme deliberately — Rule out air-dry, refresh and delicate cycles first.
About 5 min
- Wash the lint filter under a hot tap and vacuum its housing — Water should pour straight through the mesh. If it beads, the film is restricting airflow.
Tools: vacuum, washing-up liquidAbout 25 min
- Clear the duct or rinse the condenser unit — Whichever the machine has, and check for crushing where the machine meets the wall.
Tools: brush, torchAbout 30 min
- Run a short cycle and feel the exhaust air — Warm air at the vent means the heat is working. Stop here: the rest is measured.
About 20 min
Safety first, and it is not boilerplate
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. A thermal device that operated did so to prevent a fire, so resetting one without clearing the airflow simply schedules the next overheat. On gas models leave the burner and its connections alone; if you smell gas, leave the building without operating any switch and call the gas utility or the emergency services from outside.
Where the owner fix ends
Call when the lint path is clear, a heat programme is selected and the machine still tumbles cold, because the element, the thermostats and the cut-outs need measuring across isolated terminals. Call a registered gas engineer for a gas model with no ignition. Ask for the airflow to be checked at the same visit rather than only the failed part, because a machine that cut out once will do it again if nothing upstream changed.
Nearest pages of this class
What this page does not cover
This page is the class-level answer for an Ariston dryer that will not heat. It carries no element ratings, no thermostat values and no burner data, because those differ between builds under this badge and gas components are not owner territory. Where a family- or model-specific page exists it holds those details. Ducting and vent routing belong to the installation; gas supply and flues belong to a registered gas engineer.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
