LG Dehumidifier: not accumulating water

Professional Repair Guide

What is this symptom?

Is your LG dehumidifier running but not accumulating water? This could indicate low humidity levels, a clogged air filter, or issues with the float switch or evaporator coils. Understanding these potential causes can help you troubleshoot effectively.

Urgency: Medium

Important Tips for LG Models

  • Official LG support lists troubleshooting information for ‘no water collection’ but details may vary by model; consult model‑specific manual.

Possible Causes

Low ambient humidity or inappropriate environmental conditions

How to Identify: Actual room relative humidity is low or temperature is below optimal for refrigeration‑based dehumidification; little moisture to extract. No water in bucket even after long operation with adequate airflow.

Part: N/A (environmental)

Clogged or dirty air filter reducing airflow

How to Identify: Reduced or no airflow from the intake even though unit appears to run; filter looks visibly dirty or dusty.

Part: Air filter

Frozen evaporator coils

How to Identify: Ice buildup visible on coils; machine stops collecting water especially at lower temperatures; may resume after defrost cycle.

Part: Evaporator (cold) coils / defrost system

Stuck or faulty float switch / water tank sensor

How to Identify: Unit stops prematurely indicating full tank even when bucket is empty; symptoms repeat after emptying. Often triggers off without tank filling.

Part: Float switch or water level sensor

Fan failure or restricted airflow due to obstruction

How to Identify: No or weak airflow from vents though lights and some components run; audible hum but little air movement.

Part: Fan motor / fan blades

Internal mechanical or refrigerant fault (compressor, refrigerant leak, control board)

How to Identify: No water collection with normal airflow and humidity present; compressor does not cycle or runs but no cooling across coils.

Part: Compressor, refrigerant circuit, control board

DIY Solutions

Clean or replace the air filter

Easy 10–20 minutes
  1. Turn off and unplug the dehumidifier.
  2. Locate and remove the air filter (refer to manual).
  3. Vacuum or rinse the filter; allow it to dry fully before reinstallation.
  4. Reinstall the filter and run the unit.
⚠️ Safety First: Always unplug unit before maintenance

Check and adjust placement/room conditions

Easy 5–15 minutes
Tools Needed: hygrometer (optional)
  1. Ensure room doors/windows closed and space is not overly ventilated.
  2. Move the unit away from walls/obstructions for proper airflow.
  3. Check humidity with a hygrometer; confirm levels are above ~50%.
  4. Adjust temperature where feasible above ~15℃ for optimal operation.

Reset or test the float switch

Moderate 10–20 minutes
  1. Remove the water bucket.
  2. Locate the float inside the tank cavity.
  3. Gently tap or move the float to ensure it is not stuck.
  4. Reinsert the bucket and test operation.
⚠️ Safety First: Don’t force components beyond light taps

Next step

Choose the next step for not accumulating water

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Appliance Air Filter

Captures dust and debris from the appliance's intake airflow.

Typical part-only price
$12 - $55
DIY difficulty
Easy
Estimated time
5-10 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Possible related component

Compressor

Compresses refrigerant within the sealed cooling system and requires specialized service equipment.

$180 - $600 · Hard · 120-240 mins

Check fit & price
Possible related component

HVAC Control Board

Controls fan, compressor, sensor, and communication functions in the HVAC unit.

$90 - $320 · Hard · 45-120 mins

Check fit & price
Model number required

Model-compatible Dehumidifier parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.

Professional Repairs

Replace evaporator coil defrost or refrigerant system repair

Estimated Cost: $150 - $400

Fan motor or control board replacement

Estimated Cost: $100 - $350

Compressor replacement or major mechanical service

Estimated Cost: $200 - $600

When to Call a Professional

No water collected after filter cleaning and environmental adjustments
Visible frost buildup that recurs quickly during normal operation
No or weak airflow despite fan checks
Strange noises or heating issues indicating internal component failure

Preventive Maintenance

  • Clean air filter: Airflow restriction and reduced water collection
    Frequency: monthly
  • Ensure proper placement and monitor room humidity: Ineffective dehumidification due to environmental conditions
    Frequency: as needed

Frequently Asked Questions

Why is my LG Dehumidifier not accumulating water?
Common causes include low ambient humidity, a clogged air filter, frozen coils, or a faulty float switch.
How do I fix LG Dehumidifier not accumulating water myself?
You can clean or replace the air filter, adjust room conditions, or reset the float switch.
How much does it cost to fix not accumulating water?
Professional repairs range from $100 to $600 depending on the issue, like fan or compressor replacement.
When should I call a technician for not accumulating water?
Contact a technician if DIY solutions don't work or if mechanical issues are suspected.

References & Sources

Community Analytical Insights

Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions

Common Issues Reported by Users

  • The humidity level in the room is too low for the dehumidifier to operate effectively.
  • The dehumidifier's water tank is full, causing it to stop accumulating water.
  • The air filter is clogged, restricting airflow and reducing efficiency.
  • The dehumidifier is set to a high humidity threshold, preventing it from activating.
  • Internal components such as the compressor or fan motor are malfunctioning.

User Suggested Solutions

  1. Check the humidity level in the room using a hygrometer. If it's below the dehumidifier's operating range (typically 30-40% RH), it may not accumulate water. Adjust the settings or use the dehumidifier in a more humid environment.

  2. Inspect the water tank for fullness. If it is full, empty it and ensure it is properly seated in the unit. The dehumidifier should resume normal operation.

  3. Remove and clean the air filter according to the manufacturer's instructions. Allow it to dry completely before reinserting it. This will improve airflow and efficiency.

  4. Check the humidity threshold settings on the dehumidifier. Lower the setting to activate the unit if it's set too high.

  5. If the unit still does not accumulate water after checking the above, inspect for internal issues such as a malfunctioning compressor or fan motor. This may require professional assistance.

Limited-source guidance; percentages and success-rate claims are not shown
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. LG ud501kog5 dehumidifier

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