LG Dehumidifier: fan not running

Professional Repair Guide

What is this symptom?

If your LG dehumidifier powers on but the fan isn't running, it may be due to a dirty fan, a faulty humidity sensor, or electrical issues. Airflow is crucial for effective dehumidification, so identifying the cause is essential for restoring functionality.

Urgency: Medium

Important Tips for LG Models

LG error codes CH02/CH03 can indicate control board or sensor anomalies that may relate to fan and other electronic control issues

Possible Causes

Blocked or dirty fan/blower wheel

How to Identify: No airflow, possible vibration when attempting to start, visible dust build-up on intake or fan area

Part: Fan blade / blower wheel

Faulty humidity sensor causing fan not to trigger

How to Identify: Unit does not start fan even when humidity is high; sensor test or replacement resolves behavior in some reports

Part: Humidity sensor

Electrical control / main board failure

How to Identify: No fan start despite power and no obvious blockages; error codes related to electronic abnormality (CH02/CH03 may appear on some models. (

Part: Control board / electronic control

Internal safety thermal cutoff engaged

How to Identify: Unit shuts off fan to prevent overheating; may restart after cooling period

Part: Thermal cutoff / safety switch

DIY Solutions

Clean fan and air intake filter

Moderate 30-60 minutes

Tools Needed: screwdriver, soft brush/vacuum

Unplug the unit and remove external cover per manual
Remove and clean air filter
Access fan/blower area and gently clean dust and debris from blades
Reassemble unit and test operation

⚠️ Safety First: Always unplug before accessing internal parts

Test humidity sensor function

Advanced 30 minutes

Tools Needed: multimeter

Unplug and access the humidity sensor location
Using multimeter, test sensor values against expected resistance/humidity readings
Replace sensor if readings out of spec

⚠️ Safety First: Electrical testing requires caution

Next step

Choose the next step for fan not running

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

Humidity Sensor

Measures relative humidity so the appliance can regulate drying or moisture removal.

Typical part-only price: $20 - $100
DIY difficulty: Medium
Estimated time: 20-60 mins

Optional: enter your model number

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

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

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Professional Repairs

Replace control board or electronic module

Estimated Cost: $80 - $200

Replace fan motor/blower assembly

Estimated Cost: $50 - $150

When to Call a Professional

Fan still does not spin after cleaning and sensor testing

Control board error codes displayed

Burning smell or smoke emanating from unit

Preventive Maintenance

Clean air filter: Fan blockage and airflow restriction
Frequency: monthly
Keep unit free of dust around intake: Debris build-up affecting fan and sensors
Frequency: monthly

Frequently Asked Questions

Why is my LG Dehumidifier fan not running?

Common causes include a blocked fan, faulty humidity sensor, or electrical control board failure.

How do I fix LG Dehumidifier fan not running myself?

Clean the fan and air filter, or test and replace the humidity sensor if necessary.

How much does it cost to fix fan not running?

Professional repairs range from $50 to $200 depending on whether you need a new fan motor or control board.

When should I call a technician for fan not running?

If DIY solutions don't work or you're unsure about testing components, it's best to consult a professional.

References & Sources

LG Dehumidifier Error Code List Official

Community Analytical Insights

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

Common Issues Reported by Users

Fan motor failure due to wear and tear or electrical issues
Clogged air filter restricting airflow
Faulty control board preventing fan activation

User Suggested Solutions

Check and replace the air filter if clogged. Ensure the unit is unplugged, remove the filter, clean or replace it, and reassemble the unit.
Inspect the fan motor for damage. If the motor is burnt out, it will need to be replaced. Unplug the unit, remove the fan cover, and check the motor.
Test the control board for faults. If the board is malfunctioning, it must be replaced. This requires checking connections and possibly using a multimeter.

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