LG Error Code OP — Sail switch / thermistor

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

Quick fix: Ensure the dryer is properly vented and free of obstructions.

What Does LG Error Code OP Mean?

LG dryer: Sail switch / thermistor

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 OP. Work through them in the order shown — they are listed from most common to least common.

  1. Faulty sail switch
  2. Defective thermistor
  3. Blocked venting system
  4. Control board malfunction
  5. Wiring issue between components

Step-by-Step Troubleshooting (5 steps)

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

  1. Disconnect power before servicing.
  2. Inspect the sail switch for proper operation and continuity.
  3. Test the thermistor for correct resistance values.
  4. Check the venting system for blockages or restrictions.
  5. Examine wiring connections for damage or loose connections.

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.

  • Sail switch
  • Thermistor
  • Vent duct
  • 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 OP, 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.

Other LG Error Codes

tcL — Tub Clean Reminder (Not Error)Alrm — Vault switchE:HC — Heater circuit (gas)Temp — SensorF55 — Not dry after 180 minDH — Error Code DHd5 — Error Code d5LE1 — Error Code LE1
All LG Error CodesAll Error CodesService Guy AI DiagnosisOrder OEM PartsEquipment Hub

By — Founder, WashBizHub. Third-generation laundromat operator. Reviewed by the WashBizHub editorial team.

 · 

WashBizHub — Laundromat Industry Intelligence Platform. Contact · About · Privacy Policy · Terms of Service

© 2026 WashBizHub. WashBizHub is editorially independent. Where we earn affiliate revenue (e.g., AAdvantage funding referrals), it is clearly labeled.