Appliances
Tumble dryer running but nothing’s drying?
Drying is a supply chain: heat in, moisture out, air moving between the two. When a dryer tumbles for hours and hands back damp washing, one link in that chain is blocked, and it is nearly always one you can reach. Start with the filter you should be emptying anyway.
By the Tickover team · Published 18 May 2026 · 4 min read
Airflow is the whole game
Whatever the type, a dryer works by pushing warm air through wet clothes and getting the damp air away. Block the path, with lint, a clogged condenser or a squashed hose, and the machine runs hot, dries badly and eventually trips its own thermal cut-out to protect itself.
The airflow service
Unplug it and strip the lint filter
Plug out first. Peel the lint mat off, then wash the mesh under a warm tap; softener leaves an invisible film that blocks airflow even when the mesh looks clean. Dry it before refitting.
Rinse the condenser box through
Condenser models hide a second filter, a finned box behind a lower flap. Slide it out over a towel and run water through until it flows clear. Drip dry, refit.
Empty the water tank, check the float
A full tank stops many condensers mid-cycle with a cryptic light. Empty it every load, and check the tank seats properly.
Trace the hose on vented models
Follow the hose from machine to wall: no kinks, no crush behind the machine, and a wall flap outside that opens freely and is not felted shut with fluff.
Wipe the moisture sensor bars
The metal strips inside the drum rim read dampness; softener film convinces them clothes are dry. Wipe with a damp cloth and a splash of white vinegar.
Give it air and a fair test
Pull the machine out of its alcove a little, leave the room door open, and run a half load of towels on a full cycle.
Know your dryer, judge it fairly
Half of “broken” heat-pump dryers are healthy machines being judged by vented-dryer standards. They dry at lower temperatures for longer, and the drum barely feels warm; that is the design, and the running costs reward it.
| Type | How it dries | Watch for |
|---|---|---|
| Vented | Blows damp air out a hose | Kinked hose, blocked wall flap |
| Condenser | Cools air, collects the water | Condenser box needs rinsing |
| Heat pump | Recycles heat at low temperature | Longer cycles are normal |
~1 kWh
per load for a heat-pump dryer, as a guide
2–3 kWh
per load for vented and condenser types
Multiply by your unit rate and a heat-pump machine roughly halves the cost of every load, which is a point in its favour when a dryer reaches the end of the repair or replace maths. Dryers typically serve 8–12 years; belts and filters are worth fixing, a failed heat pump on an old machine rarely is.
The habits that keep it drying
- Lint filter cleared after every load
- Condenser box rinsed monthly
- Water tank emptied every load
- Sensor bars wiped monthly
- Vent hose and wall flap checked each season
- Loads at two-thirds of drum, not rammed
When it is beyond the filters
If the airflow service changes nothing, the usual suspects are a snapped belt (drum will not turn, motor hums), a failed heater, or a thermal cut-out that has done its final trip. All of these live behind the casing, which stays shut: on top of the mains parts, heat-pump dryers carry a sealed refrigerant circuit that must never be opened, the same rule as a fridge.
A dryer that trips the house electrics is telling you something different again; treat that as a wiring-adjacent fault and read the home electrics guide before anything else. And while the machine is out of action, dry indoors without breeding damp using the indoor drying guide, because a rack in a shut room causes its own problems.
Damp towels, no obvious cause?
Self-Diagnose in the Tickover app runs your dryer’s symptoms through a few questions, names the likely fault, and tells you whether it is a filter job or an engineer visit.
Quick answers
Why are my clothes still damp after a full drying cycle?
Blocked airflow, in most cases. Wash the lint filter mesh under a tap, rinse the condenser box through if you have one, empty the water tank, and check a vented hose for kinks. Overloading and fabric-softener film on the moisture sensors cause the same symptom. If a thorough airflow clean changes nothing, the heater or sensors need an engineer.
Why does my tumble dryer keep stopping mid-cycle?
Usually the machine protecting itself. A full water tank stops many condenser dryers, and overheating from blocked filters trips the thermal cut-out. Empty the tank, clean every filter and give the machine ventilation space. If it still cuts out, book a repair; a safety cut-out must never be bypassed or bridged, because it is the part standing between a blockage and a fire.
Do heat-pump tumble dryers take longer to dry?
Yes, and it is by design rather than a fault. They dry at lower temperatures and recycle their heat, so cycles run longer while using roughly a third to a half of the electricity of a vented or condenser machine. The drum and the clothes also feel cooler at the end. Judge one by the moisture in the load, not by the warmth of the drum.
Are tumble dryers a fire risk?
They can be when lint builds up around heat, which is why the filter needs clearing after every load, not every month. Keep the machine ventilated, never run it overnight or when the house is empty, stop using any dryer that smells hot or scorched, and never bypass a thermal cut-out. A well-maintained dryer used attended is a low risk.
This guide is general information for UK homes, not advice about your specific property. Anything involving gas must be done by a Gas Safe registered engineer, and notifiable electrical work by a qualified electrician. If you smell gas, call the National Gas Emergency line on 0800 111 999. If you’re ever unsure, stop and get a professional in — that’s exactly what Tickover is for.
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