Symptoms
- Rattling, buzzing, or humming during operation
- Noise changes with fan speed
- Unit vibrates on the floor
- Grinding sound
Likely causes
- CommonUnit not sitting level on the floorVibration on an uneven surface causes buzzing and rattling.
- CommonDirty filter or coil making the compressor and fan work harderExtra strain can increase running noise.
- PossibleLoose front grille or bucketA bucket or panel that isn't seated tightly can rattle.
- PossibleWorn compressor or fan motor bearingsProduces a grinding or squealing noise that worsens over time.
What to do
- Move the unit to a hard, level floor and check it isn't rocking.
- Clean the filter and, if accessible, gently clean the coil to reduce strain on the fan and compressor.
- Make sure the bucket and front grille are pushed in fully and seated correctly.
- Place a rubber mat or pad under the unit to dampen vibration noise.
- Listen for a steady grinding or squealing tied to the fan or compressor rather than a rattle, which points to worn bearings.
- If the noise is a mechanical grinding from inside the sealed compressor, it isn't a DIY fix.
Tools and parts
- Level
- Rubber mat
- Soft brush
Replacement dehumidifier filterSearch: “dehumidifier filter”
When to call a pro
Call an appliance technician if the noise is a persistent grinding or squealing from the fan or compressor.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.