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Error code reference

LG Hvac Error Code 67

ODU fan motor not rotating or not proving rotation.

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ODU fan motor not rotating or not proving rotation.

First step from the service manual

Verify fan motor plugged in correctly & fan rotates freely. Verify 310V DC on motor wires with motor plugged in; 0V DC=failed PCB, 310V DC=likely failed motor. Unplug motor and spin fan: 0V DC=motor failed and caused board failure, 14-30V DC=good motor.

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

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What 67 means on a LG hvac

Error code 67 on an LG outdoor unit (ODU) indicates that the outdoor fan motor is either not rotating or the control board is not receiving confirmation that rotation is occurring. The outdoor fan motor is responsible for drawing air across the condenser coil to dissipate heat during cooling or absorb heat during heating. When the system cannot verify that the fan is spinning, it shuts down to protect the compressor and refrigerant circuit from overheating or pressure-related damage.

The diagnostic process for this code centers on checking 310V DC bus voltage at the motor connector. This high-voltage DC signal is what the inverter-driven fan motor requires to operate. If 310V DC is present at the connector but the motor is not spinning, the motor itself is the likely failed component. If 0V DC is present with the motor plugged in, the PCB has likely lost its ability to output drive voltage and the board is the primary suspect.

There is an additional nuance when the motor is unplugged and the fan blade is spun by hand. A functioning permanent magnet motor will generate back-EMF, producing a readable voltage of 14 to 30V DC on the motor wires during manual rotation. If the motor produces 0V DC when spun freely, it indicates the motor windings or magnets have failed internally, and this failure may have also damaged the PCB. This back-EMF test is critical for determining whether a board replacement alone will resolve the issue or if both components need replacement.

Source: manufacturer service documentation.

Common causes of 67

  1. 01

    Failed outdoor fan motor

    Part replacement

    The fan motor windings or internal magnets have failed, preventing rotation. Confirmed when 310V DC is present at the connector but the motor does not spin, or when manually spinning the unplugged motor produces 0V DC back-EMF instead of the expected 14 to 30V DC.

  2. 02

    Failed outdoor unit PCB

    Part replacement

    The main control board has lost the ability to output the 310V DC drive signal to the fan motor. Identified when 0V DC is measured at the motor connector with the motor plugged in.

  3. 03

    Motor connector not seated or wiring fault

    Wiring / connection

    A loose, corroded, or disconnected motor connector can interrupt power delivery and cause this code even when the motor and board are both functional. Inspect all motor wiring connections at the PCB and motor terminals before proceeding to component-level testing.

  4. 04

    Fan blade obstruction or mechanical binding

    Wiring / connection

    Debris, ice buildup, or a seized bearing can prevent the fan blade from rotating freely, triggering the fault. Verify the fan spins freely by hand before performing any electrical diagnostics.

  5. 05

    PCB damaged by prior motor failure

    Part replacement

    A motor that failed in a shorted condition can send damaging feedback to the control board, causing both components to fail together. When the unplugged motor produces 0V DC during manual spin, inspect the PCB for burn marks or component damage, as replacement of both parts may be necessary.

See the test procedure for each cause

Frequently asked questions about 67

What does 67 mean on a LG hvac?
Error code 67 on an LG HVAC system means the outdoor unit fan motor is not rotating or the control board cannot confirm that it is spinning. The system shuts down when this fault is detected to prevent compressor or refrigerant damage. Diagnosing the code requires checking for 310V DC at the motor connector to determine whether the motor or the PCB is the failed component.
Can I fix error code 67 on my LG outdoor unit myself?
The initial checks, such as confirming the fan blade spins freely and inspecting motor wiring connections, are safe for a knowledgeable DIYer. However, the electrical diagnostics involve 310V DC, which is hazardous and should only be performed by a qualified technician with proper safety equipment. Component replacement, particularly PCB swaps, also requires handling high-voltage capacitors that retain charge even after power is removed.
Is it safe to keep running my LG HVAC system when error code 67 is active?
No. When error code 67 is active, the outdoor fan is not operating, which means the condenser coil cannot properly reject or absorb heat. Continuing to operate the system under this condition risks overheating the compressor, causing high refrigerant pressure, and leading to significantly more expensive damage. The system should remain off until the fault is diagnosed and repaired.
How much does it cost to repair LG HVAC error code 67?
Repair costs vary depending on which component has failed. A fan motor replacement typically ranges from a few hundred dollars to over five hundred dollars including labor. PCB replacement tends to cost more, often ranging from several hundred to over a thousand dollars depending on the unit model. If both the motor and PCB have failed together, total repair costs can approach or exceed the value of older units.
Will resetting the LG outdoor unit clear error code 67?
A power reset may temporarily clear the fault code, but if the underlying cause, such as a failed motor or PCB, has not been corrected, the error will return as soon as the system attempts to run the outdoor fan. Resetting without repair does not address the mechanical or electrical failure and may allow the system to attempt operation in a condition that causes further damage.

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