My dehumidifier compressor has become very noisy
Home Nura guide — category Smart Dehumidifiers
Diagnosis
A dehumidifier that has become noisy more often has an unstable stand, a clogged filter or frost on the coil than a genuinely failing compressor. A metallic rattle or a drone that keeps getting worse over time, however, deserves a closer check.
Possible causes
- Unit not level or standing on a hard floor — the compressor's vibrations travel into the floor and amplify the noise.
- Blocked air filter or dirty fan — air flows poorly, the motor strains and the drone gets louder.
- Frost on the coil or reservoir not seated — parts rub, click or strain on every restart.
- Worn mounts or compressor — the sound becomes dull, shrill or knocking, especially after several years of use.
Recommended procedure
- 1Unplug the unit, check it stands flat and place it on a rubber mat or anti-vibration pad.
- 2Remove and wash the air filter in lukewarm water, then dust the grilles and the back with a vacuum and soft brush.
- 3Empty the reservoir, refit it firmly until it clicks and make sure no panel or cover has worked loose.
- 4If frost is visible, switch off and let it defrost at room temperature, then restart it in a warmer room.
- 5After any stop, wait three minutes before switching on again, and if the noise continues, do not open the cooling circuit: contact the manufacturer.
Repair or replace?
If the noise remains after levelling, cleaning and defrosting, and comes with weaker performance or repeated shutdowns, the compressor is probably near the end of its life. Out of warranty, replacing it costs nearly as much as a new unit.
If you replace it
Smart Dehumidifiers: the models in our buying guide
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Best overall
Meaco Arete Two 20L
20 L a day, 4.8 L tank, HEPA filter, Wi-Fi with Alexa and Google Home, and a reputation for low energy use and quiet running.
Photo: © Meaco
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Best value
Comfee MDDF-16DEN7-WF
16 L a day, Wi-Fi with Alexa support, laundry mode and continuous drainage in a compact entry-level body.
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Best for bedrooms
Xiaomi Smart Dehumidifier Lite
A small 13 L/day unit with a quiet sleep mode and Xiaomi Home app control, ideal for a bedroom or bathroom.
Photo: © Xiaomi
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Other common failures on this category
These incidents affect the same type of appliance — diagnosis and recommended procedure for each.
- Smart DehumidifiersThe tank on my dehumidifier barely fills up anymore
- Smart DehumidifiersHow much power does a dehumidifier use when running continuously?
- Smart DehumidifiersThe heat exchanger on my smart dehumidifier frosts over and the unit stops
- Smart DehumidifiersMy smart dehumidifier shows the full-tank alarm even though the tank is empty
Frequently asked questions
In Europe, any smart dehumidifiers bought new from an official reseller benefits from a legal conformity guarantee of at least two years (Directive (EU) 2019/771). This guarantee covers defects present at delivery, whenever they first manifest.
You can pick: European law puts the legal guarantee on the seller, not the manufacturer. In practice, a store return is usually faster, but the manufacturer can repair if the damage is out of warranty. Keep proof of purchase.
Our public methodology adds a Nura Score /10 penalty to any smart dehumidifiers whose recurring failures are documented in European user feedback. A model that breaks too often never tops our charts, brand notwithstanding.
Yes, within the limits of the European "right to repair": routine maintenance tasks (cleaning, gasket replacement, calibration) never void the legal warranty. Only irreversible hardware modifications can be a problem. For a smart dehumidifiers, any handling documented in the manufacturer's manual stays covered.
The directive imposes a two-year legal conformity guarantee, with a presumption of pre-existing defect during the first twelve months — the burden of proof is on the seller. For a smart dehumidifiers that breaks in that window, you're entitled to free repair or replacement, no strings attached on typical use.