LG Error Code F55 — Not dry after 180 min

Service Guy AI • Dryer • Medium severity • Intermediate skill • ~30 min repair

What Does LG Error Code F55 Mean?

LG dryer: Not dry after 180 min

This is a medium-severity fault. The machine may complete the current cycle but is signalling a problem you should resolve before it escalates.

Possible Causes (5)

LG engineers identify the following root causes for fault code F55. Work through them in the order shown — they are listed from most common to least common.

1. Blocked vent duct
2. Faulty moisture sensor
3. Clogged lint filter
4. Defective heating element
5. Malfunctioning control board

Step-by-Step Troubleshooting (6 steps)

Follow this sequence to diagnose and clear LG error code F55. Power down and unplug the machine before any internal inspection.

1. Disconnect power before servicing.
2. Check and clean the lint filter.
3. Inspect the vent duct for blockages.
4. Test the moisture sensor for proper operation.
5. Examine the heating element for continuity.
6. Check the control board for error codes or damage.

Required Parts

Have these LG OEM part numbers ready before starting the repair. AAdvantage Laundry Systems carries verified parts for every code in this database.

• Moisture sensor
• Vent duct assembly
• Lint filter
• Control board

Diagnostic Test Mode

Enter LG diagnostic test mode: Hold 'Rinse+Spin + Power' for 3 seconds

Skill Level & Repair Time

This repair is appropriate for an experienced laundromat owner or in-house technician. You should be comfortable removing service panels, reading wiring diagrams, and using a multimeter to test continuity and voltage. Plan for approximately 30 minutes of active repair time once parts are on hand.

Get AI-Powered Diagnosis

If the steps above don't resolve LG F55, run a free Service Guy AI diagnosis. Upload a photo of the error display and get an AI-generated repair plan tied to your exact LG model number, including supplier links for required parts and on-call technician escalation.

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