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Error code reference

LG Hvac Error Code 14

Compressor Phase Amperage Error.

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Compressor Phase Amperage Error.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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What 14 means on a LG hvac

Error code 14 on an LG HVAC system indicates a Compressor Phase Amperage Error. This fault is triggered when the control board detects an abnormal current reading on one or more phases of the compressor's power supply. In a three-phase compressor system, balanced amperage across all phases is critical for proper motor operation. When the current on any single phase deviates significantly from expected values, the system flags this error to protect the compressor from damage caused by phase imbalance, overcurrent, or undercurrent conditions.

The compressor is the core component of the refrigeration cycle, responsible for pressurizing refrigerant and driving heat exchange. When phase amperage becomes unbalanced or falls outside acceptable operating parameters, it typically points to issues with the power supply, internal compressor winding faults, or failures in the inverter board that controls compressor speed and output. An open or shorted winding within the compressor motor can cause one phase to draw significantly higher or lower amperage than the others.

Diagnosing this error requires measuring actual amperage on each compressor phase using a clamp meter and comparing readings to the unit's rated specifications. A technician should also inspect the inverter or power module board for signs of burning or damaged components, and verify that incoming supply voltage is stable and balanced across all phases. A weak or failing capacitor in systems using single-phase compressors can also produce abnormal current signatures that trigger this fault.

Source: manufacturer service documentation.

Common causes of 14

  1. 01

    Faulty or Failing Compressor Windings

    Part replacement

    Worn or shorted internal motor windings cause uneven current draw across phases. This can be identified by measuring resistance across each compressor terminal and comparing readings for significant imbalance.

  2. 02

    Inverter or Power Module Board Failure

    Part replacement

    The inverter board controls power delivery to the compressor, and a damaged module can output unbalanced phase voltage or current. Visible burn marks, swollen capacitors, or irregular output readings confirm this cause.

  3. 03

    Unbalanced or Low Incoming Supply Voltage

    Wiring / connection

    If the incoming three-phase power supply from the building is unbalanced or below rated voltage, the compressor will draw unequal amperage across phases. Verify supply voltage at the disconnect with a multimeter under load.

  4. 04

    Loose or Corroded Electrical Connections

    Wiring / connection

    High-resistance connections at the compressor terminals or power wiring can cause localized voltage drop and abnormal current readings. Inspect all terminals for corrosion, looseness, or heat discoloration.

  5. 05

    Refrigerant Charge Issues Causing Compressor Overload

    Wiring / connection

    An overcharged or severely undercharged refrigerant system can cause the compressor to work beyond its design parameters, resulting in elevated or erratic amperage draw. Check system pressures alongside electrical diagnostics.

See the test procedure for each cause

Frequently asked questions about 14

What does 14 mean on a LG hvac?
Error code 14 on an LG HVAC system indicates a Compressor Phase Amperage Error. The system has detected that the electrical current on one or more compressor phases is outside the acceptable operating range. The unit shuts down to prevent compressor damage. A technician should measure phase amperage and inspect the inverter board and compressor windings.
Can I fix error code 14 on my LG HVAC myself?
Most causes of error code 14 require professional diagnosis involving live electrical measurements at the compressor and inverter board. Checking for loose or corroded wiring connections at the unit's power terminals is something a knowledgeable DIYer can safely do with the power off. However, compressor winding testing, inverter board replacement, and refrigerant system evaluation require a licensed technician.
Is it safe to keep running my LG HVAC with error code 14?
No, you should not attempt to bypass or continuously reset the system while this error is active. The fault is a protective shutdown designed to prevent catastrophic compressor failure. Running the unit with a phase amperage problem can cause overheating, winding burnout, or further damage to the inverter board, all of which significantly increase repair costs.
Will resetting my LG HVAC clear error code 14?
A power reset may temporarily clear the error and allow the unit to restart, but if the underlying cause is not resolved, the fault will return, often quickly. Repeated resets without addressing the root cause can accelerate compressor or board damage. A proper diagnosis should be performed before relying on a reset as a solution.
How much does it cost to repair error code 14 on an LG HVAC?
Repair costs depend heavily on the root cause. Fixing loose wiring or rebalancing power supply issues may cost between $75 and $200 for a service call. Inverter or power module board replacement typically ranges from $300 to $700 including parts and labor. Compressor replacement is the most expensive outcome, generally ranging from $1,000 to $2,500 or more depending on the unit size and system type.

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