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Quick answer
A brief hum or vibration when the compressor starts or stops can be normal. For a new rattle or scrape, check the level surface, bucket seating, filter, and airflow externally. Stop for burning odor, sparking, or an unresolved error code.
Before you begin
Safety first
- Do not puncture or open the sealed refrigeration circuit.
Work through in order
Diagnostic checks
Use only checks that match the exact appliance or system and its official guide.
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Check 1
Note whether the sound is a brief startup hum, continuous fan noise, cabinet rattle, or scraping.
Expected result: The sound is brief compressor vibration or a persistent abnormal noise.
Next step: Continue only with low-risk external checks when there is no smoke or burning odor.
Why this matters
Why: LG describes compressor vibration during starting/stopping as normal; persistent scraping is not established as normal.
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Check 2
Place the unit on a firm level surface, reseat the bucket, and clear the filter and airflow openings.
Expected result: The noise changes after leveling, bucket reseating, or airflow clearing.
Next step: Keep clearance around the unit and clean only accessible parts as the manual allows.
Why this matters
Why: Vibration or restricted airflow may amplify operating noise.
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Check 3
Inspect the display for a code and note whether the unit still removes moisture.
Expected result: A CH/CH24 code appears or dehumidification stops.
Next step: Do not open the sealed system; unplug if safe and request service.
Why this matters
Why: LG associates these codes with refrigerant-leak or pressure-switch conditions requiring service guidance.
Use your observations
Decision map
Find the observation that best matches what you see, then follow the next safe action.
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PATH 01Next step
What you see
Only a brief hum/vibration occurs and dehumidification is normal
Do this next
Keep the unit level and monitor for change.
Why this path and its safety boundary
Why it matters: Normal compressor operation is more likely.
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PATH 02Next step
What you see
Noise scrapes, worsens, or appears with a code or burning odor
Do this next
Stop use and request qualified service.
Why this path and its safety boundary
Why it matters: A mechanical, electrical, or sealed-system fault remains possible.
When checks do not resolve it
Need a professional?
Arrange service for abnormal noise that persists after external checks.
Safety scope: Do not puncture or open the sealed refrigeration circuit.
Common questions
FAQ
Is a hum always a failure?
No. LG says compressor vibration during starting or stopping can be normal. A new scrape or worsening rattle needs service.
Should I open the unit to locate a noise?
No. Keep checks external and request service for a persistent abnormal sound.
Read the exact guide
Official sources
- Operating your dehumidifierLG USA Support · LG dehumidifiers
- LG Dehumidifier - Error Code ListLG USA Support · LG dehumidifiers
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