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Error code reference

LG Refrigerator Error Code Error5

Defrost failure

LG codesLG refrigerator codes

Defrost failure - defective defrost heater, open temperature fuse, or disconnected connector (indicated 80 minutes after the problem).

First step from the service manual

Check defrost heater resistance, temperature fuse continuity, and connector connections.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What Error5 means on a LG refrigerator

Error5 on an LG refrigerator indicates a defrost system failure. The control board triggers this code approximately 80 minutes after detecting that the defrost cycle has not completed successfully. The defrost system is responsible for melting frost accumulation off the evaporator coils, and when it fails, ice builds up on the coils and restricts airflow, eventually causing the refrigerator to lose its ability to maintain proper temperature.

The three primary hardware faults associated with Error5 are a defective defrost heater, an open thermal fuse, and a disconnected or damaged wiring connector in the defrost circuit. The defrost heater is a resistive heating element that should measure a specific resistance value when tested with a multimeter. An open reading indicates the heater element has burned out. The thermal fuse is a one-time safety device that opens permanently if the defrost system overheats. It should show continuity when tested; no continuity confirms it has blown and must be replaced.

Diagnosing Error5 requires methodical testing of each component in the defrost circuit. Start by unplugging the refrigerator and accessing the evaporator panel in the freezer compartment. Check the defrost heater for proper resistance using a multimeter, verify continuity through the thermal fuse, and inspect all connectors in the defrost circuit for corrosion, looseness, or physical damage. A disconnected connector can mimic a failed component, so checking wiring integrity before replacing parts can prevent unnecessary costs.

Source: manufacturer service documentation.

Common causes of Error5

  1. 01

    Burned-out defrost heater

    Part replacement

    The defrost heater element can burn out over time, resulting in an open circuit. Testing with a multimeter will show no resistance or an infinite reading instead of the expected resistance value.

  2. 02

    Blown thermal fuse

    Part replacement

    The thermal fuse in the defrost circuit is a one-time safety device that permanently opens if the circuit overheats. A multimeter test will show no continuity across the fuse, confirming it needs replacement.

  3. 03

    Disconnected or damaged wiring connector

    Wiring / connection

    Connectors in the defrost circuit can loosen due to vibration or become corroded over time, interrupting the circuit without any component actually failing. A thorough visual inspection and reseating of connectors may resolve the error.

  4. 04

    Failed defrost control or sensor

    Part replacement

    If the heater, fuse, and connectors all test correctly, the defrost thermostat or control board may not be signaling the defrost cycle to initiate properly, causing the system to time out and trigger Error5.

See the test procedure for each cause

Frequently asked questions about Error5

What does Error5 mean on a LG refrigerator?
Error5 means the refrigerator's defrost system has failed to complete a defrost cycle. The code appears approximately 80 minutes after the control board detects the problem. The most likely causes are a burned-out defrost heater, a blown thermal fuse, or a disconnected wiring connector in the defrost circuit.
Can I fix Error5 on my LG refrigerator myself?
A knowledgeable DIYer can diagnose and fix this error with basic tools. You will need a multimeter to test the defrost heater resistance and the thermal fuse for continuity, and you should inspect all connectors in the defrost circuit for damage or looseness. Replacing the defrost heater or thermal fuse is a moderate-difficulty repair that involves removing the freezer's evaporator panel.
Is it safe to keep using my LG refrigerator when Error5 is displayed?
Continuing to use the refrigerator with Error5 active is not advisable for extended periods. Without a functioning defrost system, ice will build up on the evaporator coils, reducing cooling efficiency and eventually causing the unit to fail to maintain safe food storage temperatures. Address the error as soon as possible to prevent food spoilage.
How much does it cost to repair Error5 on a LG refrigerator?
Repair costs depend on which component has failed. A defrost heater or thermal fuse replacement typically ranges from $50 to $200 in parts and labor if you hire a technician. If only a connector needs to be reseated, there may be no parts cost at all. A professional diagnostic visit alone can range from $75 to $150 depending on your area.
Will resetting my LG refrigerator clear the Error5 code?
Resetting the refrigerator by unplugging it may temporarily clear the Error5 code, but the code will return if the underlying defrost system fault is not repaired. Because the control board triggers the error 80 minutes after detecting the problem, the fault will be detected again during the next defrost cycle and the code will reappear. A reset is not a fix, only a temporary workaround.

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