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Error code reference

LG Refrigerator Error Code FCT0

Compressor PCB parts defect (piston overaction)

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What the FCT0 error code actually means

Your LG refrigerator has detected a problem with the electronic control board that runs the compressor, which is the component responsible for cooling. The board's self-test found that the electrical signals it uses to monitor the compressor motor are not reading correctly. This typically means the control board itself has failed and will need to be replaced by a technician.

Diagnostic procedure

The full FCT0 procedure

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1
First diagnostic step
After power reset, check normal operation; if same error recurs, replace compressor PCB.
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Most common causes of FCT0

Ranked by how often they cause this code
  1. 1Failed compressor PCB (inverter board)
  2. 2Loose or corroded wiring harness connections
  3. 3Transient power surge or voltage spike
  4. 4Damaged compressor motor winding

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Questions people ask about FCT0

What does FCT0 mean on a LG refrigerator?
FCT0 indicates a compressor PCB parts defect involving a piston overaction condition. The compressor control board detected an error in its motor voltage and current sensing during a compressor self-check. This points to a problem with the inverter board that controls the variable-speed compressor. In most cases, the compressor PCB needs to be replaced.
Can I fix the FCT0 error myself or does it require a technician?
A power reset is something any homeowner can safely perform. Beyond that, diagnosing and replacing the compressor PCB involves working with high-voltage inverter circuitry and is best handled by a qualified appliance technician. Checking wiring harness connections at the board is a reasonable intermediate step for experienced DIYers before committing to a part replacement.
How much does it cost to fix the FCT0 error on an LG refrigerator?
If the repair requires replacing the compressor PCB, parts alone typically range from $80 to $250 depending on the specific model. Adding professional labor, the total repair cost commonly falls between $150 and $400. If the compressor motor itself is also at fault, costs can be significantly higher, making it worth getting a technician's assessment before proceeding.
Will resetting the power clear the FCT0 error on my LG refrigerator?
A power reset is the recommended first step and will clear the error if it was caused by a temporary voltage fluctuation. However, if the FCT0 code reappears after the reset, the compressor PCB has a confirmed hardware defect and the reset will not provide a lasting fix. Repeated resets without addressing the board will not restore normal operation.
Is my refrigerator safe to use while showing the FCT0 error?
When the FCT0 fault is active, the compressor may not run correctly or at all, which means the refrigerator will not cool properly. Food safety becomes a concern if the unit remains non-functional for an extended period. It is best to address the error promptly and transfer perishables to another unit if the refrigerator is not maintaining temperature.

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