Dehumidifier makes loud rattling or grinding noises during operation

Safety: Unplug the unit before inspecting moving parts. Do not insert fingers near the fan while powered.

• Check external causes: Ensure the unit is not touching walls or furniture that can resonate and amplify vibration.
• Inspect fan assembly: Remove the grille and visually inspect the fan wheel. Tighten any loose mounting screws. Remove any debris caught in the blades.
• Fan balance: Spin the fan by hand; wobbling indicates a warped blade. Replace the fan wheel / blower wheel if damaged.
• Motor bearings: If you hear grinding from the motor itself, replace the fan motor assembly.
• Compressor mounts: Access the compressor compartment and check that rubber mounts and bolts are intact and tight. Replace worn compressor mounting grommets if necessary.