AEG Condenser lightwhat it means
Not a fault code but a maintenance reminder, and the most important one on the machine. The condenser is furring up with lint and AEG tell you not to run it like that.
Take care
What this means
Machines with a condenser or a heat pump have a lamp or a symbol dedicated to this, and AEG are clear about what it is: "a common maintenance alert found on condenser and heat pump tumble dryers", meaning the condenser unit needs cleaning. It is not a breakdown. But of everything on this brand it is the one we would least ignore, and the reason is what the condenser is. It is a block of closely spaced metal fins that the machine pushes all its air through, sitting behind a flap low down at the front. Air carrying lint goes through it thousands of times, and the fins gradually pack solid.
When they do, the machine cannot move air, the heater cannot shed its heat, cycles get longer, and you are running a heating element against restricted airflow with a mat of dry lint in the path. AEG put it plainly: "Do not operate the tumble dryer when the condenser is blocked with fluff." On current heat pump machines the same component is also called the heat exchanger — AEG use the two words interchangeably in their own articles and manuals, which causes no end of confusion when people go looking for a separate part to clean.
There is one block, behind one flap, and cleaning it is the single most useful thing you can do to a dryer. The one thing that does differ is how you clean it, and AEG publish two sequences. On a condenser dryer the block slides out on a handle and is rinsed over a basin. On a heat pump dryer it stays in the machine — you lower a lid and clear the fluff with a damp cloth or a vacuum brush, and there is nothing to pull out. Trying to remove a heat pump exchanger is how fins get bent.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Ordinary lint accumulation over months of use | The expected reason and not a fault at all. Every load sheds fibres, the filter catches most of them, and what escapes ends up in the fins. This is why the check is on a schedule rather than triggered by a problem. | Common |
| The fluff filter has been run dirty, or without it fitted | The condenser fills far faster when the filter is not doing its job. AEG state directly that the machine must not be run without the filter in place, and the condenser is where that lint goes instead. | Common |
| Fabric conditioner residue binding the lint | Conditioner leaves a slight tackiness on fibres, which makes the lint mat together and cling to the fins rather than sitting loose. It turns a rinse-out job into a scrape. | Occasional |
| The fins have been bent by previous cleaning | AEG specifically warn against using a vacuum with a hard attachment because it damages the fins. Bent fins trap lint more readily and reduce airflow permanently, so the alert returns sooner each time. | Occasional |
What to try yourself
Switch the machine off and unplug it. Open the door, pull the fluff filter up and out, then open the condenser cover — the flap at the bottom front of the machine.
Wear gloves before you go any further. AEG warn "Do not touch the metal surface with bare hands. Risk of injury." The fins are thin metal and they are sharp.Turn the lever (two levers on some machines) to unlock the condenser lid and lower it. Look at the face of the block: if you cannot see light through the fins, that is your answer.
Heat pump dryer: the block stays where it is. Clear the fluff from the block and its compartment with a damp cloth and, if you need it, a vacuum cleaner with a soft brush attachment. That is the whole of AEG’s cleaning step for these machines.
Do not use a vacuum with a hard nozzle. AEG state that it "may damages the ribs of the condenser, with leads to lower performance of the appliance and longer time drying" — their wording, and it is a permanent loss. Do not try to pull the exchanger out of a heat pump machine; AEG give no step for removing it.Condenser dryer: grasp the handle and pull the condenser out of the bottom compartment, keeping it horizontal so the water left inside does not spill. Stand it upright over a basin and rinse it through with a hand shower or under a tap, then let it drain before it goes back.
Wipe out the compartment, then close the lid, turn the lever until it clicks, close the cover and refit the filter. A lid or block that is not seated lets air bypass it entirely. Vacuum lint from the airflow slots in the base while you are there — AEG list that as a separate maintenance task.
Put this in the diary. AEG give conflicting intervals in their own documents, from monthly to six-monthly; we would do it monthly, because it costs nothing and the six-monthly figure appears to be an editing oversight.
Get a qualified appliance engineer to look at your AEG tumble dryer
We do not pass enquiries to a repair firm, so there is no form here. When you book a qualified appliance engineer, tell them the make, the model and the exact code or message on the display, and ask whether they carry parts for this make — that is what turns one visit into a repair rather than a quote.
What it costs to fix
Typical repair cost
£0
Time on site
15 minutes
Nothing. This is maintenance rather than a repair, it takes about fifteen minutes, and doing it is the cheapest way to keep a dryer efficient and out of the hands of an engineer.
Typical UK prices including parts and labour, updated September 2026. Your quote may differ.
Own this appliance and had this code? . Nothing is published until a person has read it.
Related AEG fault codes
- E50Get it checkedAEG’s support site calls this a motor or software fault and sends you to an engineer. AEG’s own manual says it is usually just too much washing in the drum.Related: same brand
- E60Get it checkedThe dryer is not heating. AEG’s own page for this code is circular — it defines E60 by telling you the machine displays E60 — so here is what it actually covers.Related: same brand
- E20Get it checkedThe machine cannot get rid of the water it has collected. This is the one code AEG confirm has three faces — E20, C2, or two beeps and two flashes, depending on your display.Related: same brand
- E70Stop — call an engineerThe dryer has lost the ability to measure its own temperature. AEG tell you to unplug it for two hours and not to use it until it is fixed.Related: same brand
- E40Usually simple to fixThe machine cannot confirm the door is properly shut, so it will not start. Usually the door, sometimes the seal, occasionally the latch itself.Related: same brand
- Water tank lightUsually simple to fixThe container holding the water taken out of your washing is full, so the machine has stopped. Designed behaviour rather than a fault — though it can light with an empty tank.Related: same brand
Own an AEG tumble dryer? Save it and its codes come first next time.
Related guides
Common questions
How often does AEG actually say to clean it?
They give four answers across four documents. Two say monthly, two say every six months, and the manual and the support article are otherwise word-for-word identical and differ only in that number — someone edited one and not the other. We publish monthly, because their heat pump article says monthly and heat pump machines are what most people now own.
Is the condenser the same as the heat exchanger?
On a heat pump machine, for practical purposes yes. AEG use both words for the finned block you clean behind the lower flap, telling you to "clean the heat exchanger on a monthly basis" in one article and to clean the condenser in another, and the manual’s maintenance schedule says "Clean the Heat Exchanger" while its instructions are headed "Cleaning the condenser". There is one thing to clean, not two.
Is there a separate second filter I am missing?
Not one that AEG document. Their cleaning sequence names two things: the fluff filter in the door, which opens on a hook into two halves that both need cleaning, and the condenser or heat exchanger behind the lower cover. The half of the door filter that people miss is the inside of the hinged pair, and the compartment around the block collects fluff that a quick glance at the fins does not show. If your own manual shows a foam pad or extra filter in that compartment, follow it; the AEG and Electrolux manuals we read describe none.
Can I just keep drying until it is convenient?
AEG say not to: "Do not operate the tumble dryer when the condenser is blocked with fluff." Their stated reason is damage to the machine. Ours is that a heater working against blocked airflow with packed lint in the path is the standard description of how dryers catch fire.
Technical review
Not reviewed by an engineer
No engineer has read this page. Severity follows what the manufacturer publishes, and we would rather tell you that than let a byline imply a sign-off.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer support portal
- Manufacturer technical and service documentation
This page has not been reviewed by an engineer, and we would rather tell you that than imply otherwise. The severity rating follows what the manufacturer publishes: where they say isolate the appliance and call someone, so do we.