Complete LG Refrigerator Error Codes List and Fixes
LG refrigerators signal specific malfunctions through error codes, but not every code means a breakdown. The most frequent codes include CL (child lock), OF (open filter door), 41–45 (thermistor failures), dHE (defrost heater error), and 5E (ice maker issue). Many resolve with simple resets or component checks. This guide lists each code, its likely cause, and step-by-step fixes, with the counter-intuitive insight that some codes are normal operation, not actual faults.
The Counter-Intuitive Reality: Not All Codes Are Errors
Most owners panic when an error code appears, but CL only means the child lock is active on the ice maker or dispenser. Press and hold the lock button for 3 seconds to clear it—our guide on how to fix cl error on lg refrigerator covers all variations. No repair needed. OF indicates the water filter door is open or the filter is not fully seated. Closing the door or reseating the filter resolves it instantly.
If you see CL or OF, do not call a technician. For all other codes, start with a power reset: unplug the refrigerator for 5 minutes, then plug it back in. This clears transient glitches and often resolves temporary faults without further action.
According to LG’s official service manual, the error code dHE indicates that the defrost heater has drawn over 2.5 amps for more than 10 minutes during a defrost cycle, but the evaporator temperature has not risen above 41°F. This typically points to a failed defrost heater or a stuck defrost thermostat, not a control board issue.
First Check: Quick Decision Aid for Error Code Severity
Use this 6-item checklist to decide whether you can safely DIY or need a technician:
- Is the code CL or OF? → No action needed. CL: hold lock button 3 seconds. OF: close filter door or re-seat filter.
- Did a power reset (unplug 5 min) clear the code? → If yes, it was a temporary glitch. Monitor for recurrence.
- Is the refrigerator still cooling? → Check freezer temp with a thermometer. If above 15°F, treat as urgent.
- Is the compressor running normally? → Listen for a humming sound. If silent or clicking repeatedly, the compressor or start relay may be failing.
- Are there visible frost or ice buildup on the back wall? → Points to defrost system failure (codes dHE, dH, dEF).
- Is the water dispenser working? → If not, check water filter and valve (codes 6E, OF). If no water and no code, the door switch may be faulty.
If any check indicates a major component failure (compressor, main board, sealed system leak), call a qualified technician. For a broader overview of common issues, see common lg refrigerator problems and solutions.
Temperature Sensor Error Codes (41, 42, 43, 44, 45)
These codes signal a faulty or disconnected thermistor. Each number corresponds to a specific sensor location. From a diagnostic perspective, the failure mode is almost always open-circuit resistance drift due to moisture ingress—a design vulnerability in LG’s sensor harness connectors compared to other brands.
- Code 41 – Freezer thermistor
- Code 42 – Refrigerator thermistor
- Code 43 – Evaporator thermistor
- Code 44, 45 – Additional sensors (ice maker, ambient)
Symptom: Refrigerator runs continuously, temperatures are erratic, or the display flashes the code.
Cause: Thermistor resistance is out of spec (open circuit, short circuit, or drift) due to age, moisture intrusion, or physical damage. LG thermistors are more prone to failure at the connector pin because the housing lacks a silicone seal.
Check:
1. Locate the thermistor (usually clipped to the evaporator coils or inside the refrigerator compartment).
2. Disconnect the wiring connector.
3. Use a multimeter to measure resistance at room temperature (should be ~10 kΩ at 77°F; consult your model’s service manual for exact range).
4. Compare readings – an open line (OL) or a short (0 Ω) confirms failure.
Fix: Replace the faulty thermistor with an OEM LG part (e.g., 6740A20007A for freezer, 6740A20008A for refrigerator). After replacement, the code should clear within 5 minutes after a power reset.
What if the new thermistor still reads normal resistance but the code returns? Then inspect the wiring harness between the thermistor connector and the main board for breaks, corrosion, or chafing. Use the multimeter to check continuity pin-to-pin. If the harness is sound, the main board’s sensor input circuit may have failed. At that point, board replacement or professional diagnosis is required.
Stop signal: If the new thermistor still reads incorrect resistance, the wiring harness or main control board may have a short. At that point, professional diagnosis is recommended.
Defrost System Error Codes (dHE, dH, dEF)
These errors mean the refrigerator cannot melt frost buildup on the evaporator coils, leading to poor cooling and eventually a frozen-over coil.
- dHE – Defrost heater error (heater current too high or temperature not rising)
- dH – Defrost heat test result failure (heater not working properly)
- dEF – General defrost error (cycle did not complete)
Symptom: Frost visible on back wall of freezer, refrigerator temperature rising, or the refrigerator runs constantly without cycling off.
Cause: Failed defrost heater, defective defrost thermostat (bi-metal switch), or a faulty defrost control board. Trade-off: replacing the heater is cheap but requires disassembling the freezer back panel; the thermostat fails less often but is harder to test without a multimeter.
Check:
1. Unplug the refrigerator and remove the freezer back panel to expose the evaporator.
2. Visually inspect the defrost heater element (glass tube or wire) for breaks or burn marks.
3. Use a multimeter to check continuity of the heater: should read 20–50 Ω. Open line = replace.
4. Check the defrost thermostat (usually attached to the evaporator coils) – it should close (continuity) when below ~45°F and open above ~60°F. No continuity below 45°F means it is stuck open.
Fix: Replace the failed component. If the heater and thermostat test good, the main board may not be sending the defrost signal – replace the control board.
Escalation: If the evaporator coils are completely iced over (thick layer of ice), manually defrost with a hair dryer on low heat before replacing parts. Do not use a sharp object to chip ice – it will damage the coils. For additional guidance on defrost system troubleshooting, refer to our common refrigerator problems and solutions.
Ice Maker and Water Valve Error Codes (5E, 5E1, 5E2, 6E, OF)
These codes point to problems in the ice maker assembly or water supply.
- 5E – Ice maker sensor circuit failure
- 5E1 – Ice maker motor or gear train jam
- 5E2 – Ice maker heater/harvest cycle failure
- 6E – Water valve circuit error (open or shorted coil)
- OF – Open filter door (already covered – not an error)
Symptom: Ice maker not producing ice, ice cube overfill or no ice, water dispenser not working, or repeated clicking sounds.
Cause: For 5E codes, the ice maker module itself has a defective sensor, motor, or heater. For 6E, the water inlet valve coil is open or shorted, or the wiring harness is damaged. Mechanistically, 5E recurrence after reset suggests a corroded hall-effect sensor in the ice maker module – a known weak point in LG’s early linear compressor models.
Check:
1. For 5E series: Remove the ice maker assembly and inspect the wiring harness connector for corrosion or loose pins. Check the ice maker motor resistance (typically 150–300 Ω) and the heater resistance (10–30 Ω). If either is open, replace the entire ice maker module. 2. For 6E: Locate the water valve (behind the refrigerator, bottom rear). Measure resistance across the valve coil terminals: should be 150–250 Ω. Open = replace valve. Also check for 120VAC at the valve connector during a water dispense or ice fill cycle – if voltage is present but no water flows, the valve is mechanically stuck.
- OF: Ensure the filter door is fully closed. If the filter is old or clogged, replace it with an LG-certified filter like the LG LT1000P3 6-Month / 200 Gallon Refrigerator Replacement Water Filter, 3 Count. A blocked filter can trigger OF even if the door is closed. For single-filter models, the LG LT700P 6-Month / 200 Gallon Capacity Replacement Refrigerator Water Filter is a common compatible alternative.
Fix: Replace the ice maker module, water valve, or filter as needed. After replacement, perform a manual ice maker test (press test button) to verify operation.
Stop signal: If water fills into the ice tray but doesn’t freeze, or the ice maker cycles but produces no ice, check freezer temperature (should be 0–5°F). If temperature is correct and all parts test good, the control board may be faulty.
Communication and Control Board Error Codes (d5, d6, d7, d8, d9)
These codes indicate communication failures between the main control board and sub-assemblies (dispenser board, fan motor, ice maker, etc.).
- d5, d6 – Communication error with dispenser control board
- d7 – Fan motor communication failure
- d8 – Ice maker board communication failure
- d9 – Generic communication error
Symptom: The display flickers or shows the code intermittently, certain functions stop responding, or the refrigerator enters a safety shutdown.
Cause: Loose or corroded wiring harness connectors, a failed communication line on the control board, or electrical noise from nearby appliances. Trend-wise, d5/d6 errors have become more common in LG units manufactured between 2018 and 2021 due to a thinner ribbon cable design that flexes during door opening.
Check:
1. Unplug the refrigerator and inspect all ribbon cables and wire harness connectors between the main board and the sub-boards. Look for bent pins, corrosion, or moisture.
2. Re-seat each connector firmly. Pay special attention to the connector on the dispenser control board (behind the water dispenser panel).
3. If problems persist, check for moisture inside the control board cover. Moisture can cause intermittent shorts.
Fix: Dry any moisture with a hairdryer (low heat) and apply dielectric grease to connector pins. If the code returns, replace the faulty sub-board (e.g., dispenser board) or the main board. For d5/d6, the dispenser board is the likely culprit.
Frequently Asked Questions
What does error code 41 mean on an LG refrigerator?
Error code 41 indicates a failed freezer thermistor (temperature sensor). Check the thermistor resistance with a multimeter; if open or out of range, replace it.
How do I reset my LG refrigerator after an error code?
Unplug the refrigerator for 5 minutes, then plug it back in. This clears most transient codes. For CL, press and hold the lock button. For OF, close the filter door.
Can a dirty condenser coil cause error codes?
Yes – a dirty condenser coil can cause overheating, leading to compressor overload or sensor errors that trigger codes like 41 or general cooling failures. Clean coils every 6 months.
Why does my LG refrigerator show code dHE repeatedly?
Code dHE points to a defrost heater or thermostat failure. Test both components as described above. If they are good, the main control board may need replacement.
Is it safe to ignore error code CL?
Yes, CL is the child lock indicator, not a fault. Simply disable the lock to resume normal operation.
