Samsung NC2 fault codewhat it means and how to fix it
The inner cover of the heat exchanger is not fitted properly. Usually something an owner has just done, and usually fixable in a minute.
Take care
What NC2 means
Behind the flap at the bottom front of a Samsung heat pump dryer there is a finned block, and in front of that block sits a cover that has to be latched shut for the machine to work. Samsung give the code as "Internal heat exchanger cover problem" and ask you to check the assembly. The reason this deserves its own page is that it is nearly always self-inflicted, in a good way: it appears just after somebody has cleaned the heat exchanger and not quite got the cover back on.
That makes it the one code on this brand that tells you something encouraging, because it means you found the part of the machine most owners never open. The cover matters more than it looks. It seals the air path so that everything the fan moves goes through the fins rather than round them. With it loose, air short-circuits past the exchanger, the machine dries badly, and the compressor runs hot — which is how a cover left ajar turns into a different code a fortnight later. Push it until it latches.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| The cover was not latched after cleaning | The overwhelming majority of these. The cover seats with a definite click and it is easy to leave it resting in place looking closed, particularly if the heat exchanger behind it has been pushed back slightly proud. | Common |
| The fixers on the inner cover are not locked | Samsung’s inner cover is held by two fixers that you unlock to take it off and must turn back to lock it. A cover pushed into place with the fixers left open sits where it should and still reads as missing. Samsung’s own cure for an alarm that will not clear is to take the inner cover off and refit it. | Common |
| A latch or a hinge on the cover is broken | These are plastic parts opened and closed by hand, sometimes with force, and a snapped catch means the cover can no longer be held in the position the sensor expects. | Occasional |
| The switch that detects the cover has failed | When the cover is demonstrably shut and latched and the code persists, what is left is the sensor reporting it. That is an engineer job rather than an owner one. | Occasional |
What to try yourself
Switch the machine off and press the top of the outer cover at the bottom front so it opens and exposes the heat exchanger compartment.
Unlock the two fixers on the inner cover, pull the cover off, wipe it with a damp cloth as Samsung suggest, and look at the fixers and the edges of the cover for anything cracked or caught.
Do not touch the finned block behind the cover with bare hands. Samsung’s manual also says a small amount of refrigerant can linger in the compartment and to ventilate it for about ten minutes before cleaning in there.Reinsert the inner cover in its original position and turn the fixers to lock it. Samsung’s manual gives exactly this — remove and reinsert the inner cover — as the fix for an alarm that will not clear, so a cover that looks shut but was never locked is the usual story.
Close the outer cover. If the message persists, unplug the machine, wait thirty seconds and plug it back in, which is the other remedy Samsung give.
Restart and run a short cycle. If NC2 clears, the cover was the whole story. If it returns with the cover demonstrably locked, the switch that detects it is the remaining candidate and that is a service call.
Get a qualified appliance engineer to look at your Samsung NC2
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–£120
Time on site
10 minutes
Free almost always, since this is a cover that needs closing properly. A broken latch or a failed sensor is the only chargeable outcome and is at the cheaper end of appliance parts.
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 Samsung fault codes
- HCLStop — call an engineerThe refrigerant has leaked out of the sealed circuit. It is propane, and Samsung’s instruction is that the machine must not be used at all until an engineer has been.Related: heat pump circuit
- NCGet it checkedSamsung’s prompt to deal with the lint filter. Rated more seriously here than Samsung rate it, because a blocked filter on a dryer is not the same as a blocked filter elsewhere.Related: same brand
- 5CUsually simple to fixThe machine cannot get rid of its condensed water. Samsung group four causes under this code and the commonest is simply a full tank.Related: same brand
- HCGet it checkedThe compressor is overheating. Samsung’s website tells you to get an electrician to check the heating element — your machine does not have one, and their own manual says clean the heat exchanger.Related: same brand
- dCUsually simple to fixThe dryer thinks the door is open. Samsung name a cause most people would never guess: the child lock can produce this on a machine that is not even running.Related: same brand
- tC5Get it checkedThe sensor watching the compressor temperature is not reporting properly. Samsung ask for a longer pause than usual before you try again.Related: same brand
Own a Samsung tumble dryer? Save it and its codes come first next time.
Related guides
Common questions about Samsung NC2
It appeared right after I cleaned the filter.
Then you almost certainly have the answer. This code exists precisely for the situation where someone has been into the heat exchanger compartment and the cover has not gone back correctly. Open it and close it again firmly.
What is the difference between NC and NC2?
NC is the lint filter in the door, which Samsung word as "Check filter". NC2 is the inner cover of the heat exchanger, much lower down behind the front flap. Different components, different places, and NC2 is the one most owners have never opened.
My display shows nC2 with a small n.
Same code. Samsung’s own manuals render it as NC2 in one document and nC2 in another, and their support page uses the capital. The case carries no meaning.
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.