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Error code reference

LG Refrigerator Error Code 86

Compressor over-voltage error

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Compressor over-voltage error — input AC over 308V or R514, R515, R516 are shorted (DCLINK resistors).

First step from the service manual

Check resistance of R514, R515, R516.

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

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What 86 means on a LG refrigerator

Error code 86 on an LG refrigerator indicates a compressor over-voltage condition. The control board has detected that the AC input voltage has exceeded 308V, or that one or more of the DCLINK resistors (R514, R515, or R516) on the inverter board are shorted. These resistors are part of the DC link voltage sensing circuit, which monitors the rectified DC bus voltage used to drive the variable-speed compressor. When the board sees a voltage reading above the safe threshold, it shuts down the compressor to prevent damage to the inverter components.

The DCLINK resistors R514, R515, and R516 form a voltage divider network that allows the microcontroller to safely measure high-voltage DC bus levels. If any of these resistors short, the voltage divider produces an artificially high reading, which the board interprets as an over-voltage event even when the actual supply voltage is normal. This is a common failure mode that does not necessarily indicate a problem with the incoming power supply. Checking the resistance of R514, R515, and R516 directly on the inverter board is the correct first step to distinguish between a genuine over-voltage condition and a failed sensing component.

If the resistors test within specification, the next area to investigate is the actual AC supply voltage at the refrigerator's power inlet. True over-voltage conditions above 308V can occur due to utility grid issues, wiring faults, or a malfunctioning surge protection device. Sustained over-voltage damages inverter components, so the root cause must be identified before simply resetting the unit.

Source: manufacturer service documentation.

Common causes of 86

  1. 01

    Shorted DCLINK resistor (R514, R515, or R516)

    Part replacement

    One or more of the voltage-sensing resistors on the inverter board has shorted, causing the control board to read a falsely elevated DC bus voltage. Measure resistance across each resistor individually; a shorted resistor will read near 0 ohms instead of its rated value.

  2. 02

    AC input voltage above 308V

    Wiring / connection

    The actual incoming supply voltage to the refrigerator exceeds the 308V threshold the inverter board uses as an over-voltage cutoff. Verify the line voltage at the outlet and at the power inlet of the refrigerator using a true-RMS multimeter.

  3. 03

    Faulty inverter control board

    Part replacement

    If the DCLINK resistors test good and the supply voltage is normal, the inverter board itself may have failed circuitry that is misreading the DC bus voltage. Board replacement is typically required in this scenario.

  4. 04

    Wiring or connector fault on the inverter board

    Wiring / connection

    Loose, corroded, or damaged wiring between the power input and the inverter board can cause erratic voltage readings or intermittent over-voltage signals. Inspect all connectors and wiring harnesses associated with the inverter board.

See the test procedure for each cause

Frequently asked questions about 86

What does 86 mean on a LG refrigerator?
Error code 86 indicates a compressor over-voltage error. The refrigerator's inverter board has detected that the AC input voltage exceeded 308V, or that one of the DCLINK sensing resistors (R514, R515, or R516) on the inverter board has shorted and is producing a false over-voltage reading. The compressor shuts down automatically to prevent damage to the inverter components.
Can I fix error code 86 on my LG refrigerator myself?
Diagnosing this code requires measuring resistance on the inverter board and checking the AC supply voltage with a multimeter, both of which involve working near high-voltage components. Technicians comfortable with inverter board repair can test R514, R515, and R516 for short circuits. For most homeowners, this repair is best left to a qualified appliance technician due to the high voltages present on the inverter board.
Is error code 86 on an LG refrigerator dangerous?
The error itself means the refrigerator has already shut down the compressor as a protective measure, so immediate danger to the appliance is limited. However, if the underlying cause is a genuine over-voltage condition in your home's electrical supply, other appliances on the same circuit could also be at risk. Have your supply voltage checked promptly if the DCLINK resistors test normal.
Will resetting my LG refrigerator clear error code 86?
A power reset may temporarily clear the code, but if the shorted resistor or over-voltage condition is still present, the error will return as soon as the compressor attempts to start. Resetting without addressing the root cause does not fix the underlying fault and can delay proper diagnosis while food safety is at risk.
How much does it cost to repair error code 86 on an LG refrigerator?
Repair cost depends on the specific cause. Replacing individual DCLINK resistors is a low-cost component fix, though labor for inverter board rework adds to the total. A full inverter board replacement typically runs in the range of $150 to $400 or more for parts and labor, depending on the model and service rates in your area. If the issue is an actual supply voltage problem, an electrician may be needed as well.

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