Symptoms
- Buzzing or rattling during operation
- Unit seems to shake or 'walk' slightly
- Noise changes when moving the unit slightly
- Louder on hard floors than carpet
Likely causes
- CommonUnit not sitting level on the floorAn uneven surface lets the cabinet rock and buzz as the compressor runs.
- PossibleLoose caster wheels or a cracked baseWorn wheels can let the unit vibrate more than normal.
- PossibleWorn compressor rubber mountsMounts that cushion the compressor wear out over years of use, transmitting more vibration to the case.
- PossibleLoose internal panel or hose connectionA rattling panel can sound like a bigger mechanical problem.
What to do
- Move the unit to a hard, level floor and use a small level to check it isn't rocking on uneven ground.
- Place a thin rubber or foam mat under the unit to help absorb vibration.
- Check the caster wheels for looseness or cracking and tighten or replace them if needed.
- Open the top or side vents (per the manual) to check for loose internal panels or screws and tighten them.
- Confirm the exhaust hose and window kit aren't rattling against the window frame.
- If the noise is a low mechanical hum or buzz coming from deep inside the cabinet even on a level, padded floor, it's likely the compressor mounts.
Tools and parts
- Level
- Rubber mat
- Screwdriver
When to call a pro
Call an appliance technician if the noise clearly comes from inside the sealed compressor compartment, since that isn't a user-serviceable repair.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.