Last Updated on October 24, 2026 by Umar Farooq
A dehumidifier burning smell means you should switch it off, pull the plug at the wall and stop using it until you know why. The one honest exception is a faint dusty smell for a few minutes on a first run, and you can only call it that in hindsight.
I would rather you waste an evening on a harmless smell than ignore a hot plug. Everything below assumes the machine is already off and the plug is out of the wall.
If you smell burning, hot plastic or anything electrical, unplug the dehumidifier at the socket and move away from it. Do not open the casing, do not keep running it “to see”, and do not press the reset button over and over. If there is smoke, flame or a plug that is visibly melted, leave the room and call the emergency services. Honeywell’s manual says that if the unit is damaged or malfunctions, you should not continue to operate it and should unplug it.
What a dehumidifier burning smell usually turns out to be
Here are the likely causes in the order I would suspect them, with how worried to be. The clues column is my own reading of how these faults behave, not a tested result.
| Likely cause | Clues | Safe to run again? |
|---|---|---|
| Dust burning off | Faint hot-dust smell, first minutes only, after storage or a long gap | Yes, if it fades and does not return after cleaning |
| Blocked filter or intake | Unit hot to the touch, weak airflow, smell builds over an hour | Only after the filter is clean and the unit has cooled |
| Failing fan motor or capacitor | Sharp, acrid smell, odd fan noise, fan slow or stuck | No. Replace or get it looked at |
| Hot or damaged plug or socket | Warm plug, scorch marks, loose fit | No, not until an electrician has checked the socket |
| Damaged cord | Cracked, kinked or discoloured cable | No |
| Water or a leak onto the electrics | Smell with a wet base, tripped breaker | No |
Dust burning off
Dust settles on warm parts while a unit sits in a cupboard, then cooks off when it starts. It should be brief and mild. Desiccant models are a separate case: Andatech’s support page says a burnt or chemical odour from a new desiccant unit comes from the zeolite material, is not a fault and is not harmful to people or pets. The same page says stored-dust smells can be cleared by cleaning the filter and running the unit in an open area. A compressor model has no zeolite, so a burning smell from one is not that.
A blocked filter or intake
Honeywell’s manual tells you not to cover the air inlet or outlet because it may cause the unit to fail, and to keep the machine at least 45 cm (17.7 in) from curtains and furniture. A clogged filter does the same job as a curtain. Air stops moving, the motor works harder, and everything runs hotter. My own view: this is the cause I would bet on in a unit that has run well for months. The mechanism is in how to clean a dehumidifier.
A failing fan motor or capacitor
Bearings wear, windings overheat, starting components give up. I cannot tell you which from the outside, and neither can you without a meter and the casing off, which is not a job for a householder. What I can say is what to notice: a sharp electrical smell, a fan that sounds wrong or runs slowly, or a unit that hums and does not start. A unit that will not turn on with a burnt smell is a bad sign.
A hot plug, socket or cord
Electrical Safety First lists the warning signs: “A smell of hot plastic or burning near an appliance or socket,” blackness or scorch marks around a plug or socket, and melted plastic on casings or leads. Its advice is to unplug and contact the retailer, manufacturer or a qualified repair technician. A hot plug may be the plug’s fault, the socket’s, or a cord stuffed into the wrong place. That is why using an extension cord with a dehumidifier is the first thing I ask about.
The five checks you can do once it has cooled
Wait until the unit is cold to the touch. I do not have a number of minutes from a manual, so judge by hand: top, back and plug cold. Leave it unplugged throughout.
- Look at the filter. Slide it out. Is it furred with dust, or damp and grey? Clean it as the manual says. Honeywell’s recommends every two weeks, which is their figure for their model, not a universal rule.
- Check the intake and outlet. Anything within 45 cm of the back or vents, or a curtain drawn across them, is a suspect. Clear it.
- Inspect the cord along its whole length. Cracks, flattened kinks, bare copper or a brown patch mean a dead cord. Honeywell says not to operate any product with a damaged cord or plug.
- Look at the plug pins and the socket face. Browning, bubbling plastic or black marks mean stop here. The plug is the machine’s, but the socket is the house’s, so an electrician looks at that.
- Check underneath and inside the tank recess for water. A damp base with a smell points at a leak, and that is a different problem, covered in why a dehumidifier leaks.
If all five look clean, you can do one supervised test run in an open, uncluttered spot. Stay in the room, plug in, feel the plug and top of the unit after a few minutes, and stop at the first sharp smell or heat. If the smell has not come back after a clean filter and a clear intake, it was probably dust. If it returns, it is a fault.
Things I would never do to a dehumidifier that smells of burning
- Never take the casing off. Honeywell says not to attempt to repair or adjust any electrical or mechanical functions of the dehumidifier because it may cause danger and void the warranty. I agree, and not just for the warranty.
- Never leave it running while you work out what is wrong. That includes overnight; the overnight guide is for healthy units only.
- Never reset it repeatedly. A reset button is for a one-off trip, not for forcing a faulty unit to try again. Honeywell’s troubleshooting says to reset the safety switch, wait three minutes and call customer service if the problem persists.
- Never move it to a different socket to “test” it if the first plug looked scorched. You are moving a possible fault around the house.
- Never add an extension cord or power strip to get it back in service.
A dehumidifier burning smell that outlasts one clean-up means replace it
Replace it if the smell was sharp, the plug or cord shows heat damage, or the smell returned after a clean filter. My opinion, and it is mine rather than a measured fact: on a portable unit a heat fault is not worth chasing. A repair bill competes with a new machine, and a cheaper machine does not carry a hidden fire risk. The manufacturer route is different. If the unit is in warranty, give the model number to support and let them decide, and do not plug it back in meanwhile.
In short: a smell that survives a clean filter and a clear intake is the machine telling you it is finished. Leave it unplugged, and do not pass it on as “working”.
FAQ
Is it normal for a dehumidifier to smell like burning?
Only briefly, and only in two cases: a short hot-dust smell after storage, or the zeolite odour from a new desiccant unit, which Andatech says is not a fault. A strong, sharp or lingering smell is not normal, and neither is any smell with a hot plug.
Why does my dehumidifier smell hot but still collect water?
Because the compressor and fan can keep working while something runs hotter than it should, such as a clogged filter, a tired fan motor or a poor plug connection. Collecting water does not clear it. Stop using it.
Can I run my dehumidifier again after cleaning the filter?
Once it has cooled, the cord and plug look undamaged and the intake is clear, a supervised test run in the room is reasonable. If the smell returns, or the plug or casing is warm, it goes back to being a fault.
Can a burning smell from a dehumidifier be dangerous?
It can be: Electrical Safety First lists a burning or hot-plastic smell near an appliance or socket as a sign of overheating. I cannot give you a probability, and I would not try to. Treat it as a reason to unplug.
Should I use a dehumidifier that has a burnt plastic smell and a hot plug?
No. Leave it unplugged and ask the manufacturer or a qualified repair technician. If the socket has marks, get an electrician to check it before anything else is plugged in there.
