LG Refrigerator Error Codes

Below are the most common LG refrigerator error codes (also applies to Kenmore). Each code includes what it means, step-by-step DIY fixes, when to call a professional, and repair cost estimates.

Safety Warning

3 high-urgency code(s) should be addressed promptly. If you smell gas, hear unusual sounds, or see sparks, turn off the system and call a professional immediately.

Quick Navigation — 10 Error Codes

Code Er dH Code Er IF Code Er FF Code Er FS Code Er RS Code Er IS Code Er CO Code Er rt Code Er CF Code Er HS

LG Code Er dH: Defrost error — defrost temperature not reached within 1 hour

Medium Urgency
Estimated repair cost: $175 – $450

Common Causes

  • Excessive ice buildup around the evaporator coils
  • Failed defrost heater
  • Defective defrost thermostat or bi-metal fuse
  • Faulty main control board

DIY Troubleshooting Steps

  1. Unplug the refrigerator and open both doors for 24 hours (summer) or up to 3 days (winter) to let all ice melt.
  2. Remove all food first and store in coolers.
  3. After complete defrost, plug back in and monitor for 24 hours.
  4. If frost returns within a week, the defrost system has failed.

Call a professional when: Ice returns quickly after manual defrosting — the defrost heater, thermostat, or control board needs professional replacement.

LG Code Er IF: Ice maker fan error — ice maker fan not running

Medium Urgency
Estimated repair cost: $150 – $350

Common Causes

  • Ice buildup around the ice maker fan
  • Failed ice maker fan motor
  • Wiring issue at the fan
  • Faulty control board

DIY Troubleshooting Steps

  1. Check for ice buildup around the ice maker area — if present, defrost for 24 hours.
  2. Ensure nothing is blocking the fan vent near the ice maker.
  3. Unplug for 10 minutes to reset.
  4. Turn the ice maker off and back on.

Call a professional when: No ice is present but the fan does not run — the fan motor needs professional replacement.

LG Code Er FF: Freezer fan error — evaporator fan motor fault

High Urgency
Estimated repair cost: $150 – $400

Common Causes

  • Failed evaporator fan motor in the freezer
  • Ice buildup around the fan from a defrost failure
  • Wiring issue at the fan motor
  • Blocked fan blade

DIY Troubleshooting Steps

  1. Open the freezer and listen for the fan — press the door switch to simulate a closed door.
  2. Check for ice buildup on the back wall of the freezer near the fan area.
  3. If ice is present, unplug for 24 hours to defrost.
  4. After defrosting, plug in and listen for the fan.

Call a professional when: Fan does not run after defrosting — the evaporator fan motor needs professional replacement. Without it, the freezer and refrigerator will not cool properly.

LG Code Er FS: Freezer sensor error — freezer temperature sensor fault

Medium Urgency
Estimated repair cost: $125 – $300

Common Causes

  • Failed freezer thermistor (temperature sensor)
  • Loose or disconnected wiring at the sensor
  • Shorted sensor
  • Control board not reading the sensor

DIY Troubleshooting Steps

  1. Unplug the refrigerator for 10 minutes to reset.
  2. Check if the freezer is maintaining temperature despite the code.
  3. Ensure nothing is blocking the air vents inside the freezer.

Call a professional when: The code persists or the freezer temperature is erratic — the freezer thermistor needs professional testing and replacement.

LG Code Er RS: Refrigerator sensor error — fridge temperature sensor fault

Medium Urgency
Estimated repair cost: $125 – $300

Common Causes

  • Failed refrigerator thermistor
  • Disconnected or damaged sensor wiring
  • Control board fault

DIY Troubleshooting Steps

  1. Unplug the refrigerator for 10 minutes to reset.
  2. Check if the refrigerator compartment is cooling normally.
  3. Ensure air vents between freezer and fridge are not blocked by food.

Call a professional when: The code persists or the fridge temperature is unstable — the thermistor needs professional replacement.

LG Code Er IS: Ice maker sensor error — ice maker temperature sensor fault

Low Urgency
Estimated repair cost: $150 – $400

Common Causes

  • Failed ice maker sensor
  • Wiring issue at the ice maker
  • Ice maker assembly malfunction

DIY Troubleshooting Steps

  1. Turn the ice maker off and back on.
  2. Unplug the refrigerator for 10 minutes to reset.
  3. Check for ice buildup around the ice maker and clear if present.

Call a professional when: The code persists — the ice maker sensor or the entire ice maker assembly may need professional replacement.

LG Code Er CO: Communication error — main board communication fault

High Urgency
Estimated repair cost: $200 – $500

Common Causes

  • Loose wire harness connection between boards
  • Failed main control board
  • Power surge damage
  • Failed display board

DIY Troubleshooting Steps

  1. Unplug the refrigerator for 10 minutes to reset.
  2. Check wire connections at the top of the refrigerator door (visible when door is open, near the hinge).
  3. Plug back in and monitor.

Call a professional when: The code persists after a reset — a technician needs to inspect the board connections, wiring harness, and control boards.

LG Code Er rt: Room temperature sensor error — ambient sensor fault

Low Urgency
Estimated repair cost: $125 – $275

Common Causes

  • Failed room temperature sensor
  • Sensor wiring shorted or disconnected
  • Control board fault

DIY Troubleshooting Steps

  1. Unplug the refrigerator for 10 minutes to reset.
  2. Ensure the refrigerator is not in an extremely hot or cold location (garage, unheated space).
  3. Check if cooling is normal despite the code.

Call a professional when: The code persists — the room temperature sensor needs professional replacement.

LG Code Er CF: Condenser fan error — condenser fan not running

High Urgency
Estimated repair cost: $150 – $375

Common Causes

  • Debris blocking the condenser fan blade
  • Failed condenser fan motor
  • Dirty condenser coils causing motor overload

DIY Troubleshooting Steps

  1. Pull the refrigerator away from the wall and remove the rear lower panel to access the condenser fan.
  2. Clean any debris from around the fan blade and check that it spins freely by hand.
  3. Vacuum the condenser coils while you have access.
  4. Plug back in and listen for the fan.

Call a professional when: The fan is clear of debris but does not run — the condenser fan motor needs professional replacement.

LG Code Er HS: Humidity sensor error — humidity sensor fault

Low Urgency
Estimated repair cost: $125 – $275

Common Causes

  • Failed humidity sensor
  • Wiring issue at the sensor
  • Excessive moisture in the refrigerator

DIY Troubleshooting Steps

  1. Unplug for 10 minutes to reset.
  2. Ensure the doors seal properly — check gaskets for gaps.
  3. Reduce the frequency of door openings to lower humidity.

Call a professional when: The code persists — the humidity sensor needs professional replacement.

Need LG Repair in Central Texas?

Texas Temp Masters provides expert appliance repair for LG , Kenmore, and all major brands in Killeen, Waco, Temple, and surrounding areas. Call (817) 704-0706 for fast, reliable service, or contact us online.

Error code information cross-referenced from manufacturer documentation, HVAC/appliance professional resources, and verified repair databases. Codes can vary by specific model and control board revision. Always verify against your unit's diagnostic label or owner's manual. Repair costs are estimates based on national averages. Last updated February 2026.

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