mypros+
Error code reference

LG Refrigerator Error Code IPM

IPM (Intelligent Power Module) fault

LG codesLG refrigerator codes

IPM (Intelligent Power Module) fault - over-current from IPM short circuit and error in compressor drive PCB.

First step from the service manual

After power reset, check normal operation; check whether IPM component is burnt; check for short circuit at point A.

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

MyPros+ Max

Get the full diagnostic procedure for IPM.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What IPM means on a LG refrigerator

The IPM error code on an LG refrigerator indicates a fault within the Intelligent Power Module, which is a critical component of the compressor drive PCB (printed circuit board). The IPM is responsible for converting DC power into the variable-frequency AC power that drives the inverter compressor motor. When the module detects an over-current condition, typically caused by an internal short circuit within the IPM itself or a fault in the surrounding compressor drive circuitry, it triggers this error to protect the system from further damage.

The compressor drive PCB houses the IPM along with supporting control circuitry. A short circuit at diagnostic point A, a specific test point on the drive board, is a key indicator of where the fault originates. Physical inspection may reveal a burnt or visually damaged IPM component, which is a strong confirmation of the fault. Over-current events can result from a failed IPM module, a shorted compressor winding feeding excessive current back into the board, or deterioration of the drive PCB components over time.

Diagnosing this fault begins with a power reset to determine whether the error clears under normal operating conditions or returns immediately. If the error persists, technicians should visually inspect the IPM for burn marks, discoloration, or component damage, and then check for a short circuit at point A on the compressor drive board. Both the IPM module and the full compressor drive PCB are potential replacement candidates depending on findings.

Source: manufacturer service documentation.

Common causes of IPM

  1. 01

    Failed or burnt IPM module

    Part replacement

    The Intelligent Power Module itself has failed internally, often due to heat stress or electrical surge. Visual inspection of the IPM component on the compressor drive PCB will typically show burn marks or discoloration.

  2. 02

    Short circuit at diagnostic point A on the drive PCB

    Part replacement

    A short circuit at point A on the compressor drive board causes excessive current draw that triggers the IPM fault. Continuity or resistance testing at this test point can confirm the short.

  3. 03

    Shorted or failed inverter compressor

    Part replacement

    A compressor with shorted windings can feed abnormal current back into the IPM, causing the module to fault. Resistance testing across the compressor terminals can identify winding shorts.

  4. 04

    Damaged compressor drive PCB

    Part replacement

    Beyond the IPM itself, other components on the compressor drive PCB can fail and produce an over-current condition. If the IPM and point A test results are inconclusive, the full board may need replacement.

  5. 05

    Transient power surge or temporary over-current event

    Wiring / connection

    In some cases, a brief power surge or startup anomaly can trigger the IPM fault code without permanent component damage. A power reset and test of normal operation is the first step to rule this out.

See the test procedure for each cause

Frequently asked questions about IPM

What does IPM mean on a LG refrigerator?
The IPM error on an LG refrigerator stands for Intelligent Power Module fault. It indicates that the compressor drive PCB has detected an over-current condition, typically caused by a short circuit within the IPM component or elsewhere on the drive board. The IPM is responsible for controlling power delivery to the inverter compressor, so this fault can prevent the refrigerator from cooling properly.
Will resetting my LG refrigerator clear the IPM error code?
A power reset is the recommended first diagnostic step and may clear the code if the fault was caused by a temporary power surge or transient over-current event. However, if the IPM module is physically burnt or a short circuit is present at point A on the drive board, the error will return after reset. Persistent codes after reset indicate a hardware failure that requires hands-on inspection and likely component replacement.
How do I fix an IPM error on my LG refrigerator?
Start by unplugging the refrigerator for a few minutes and restoring power to see if normal operation resumes. If the code returns, a technician needs to inspect the IPM component on the compressor drive PCB for visible burn damage and test for a short circuit at diagnostic point A. Depending on findings, the repair will involve replacing either the IPM module, the full compressor drive PCB, or in some cases the inverter compressor itself.
Is an IPM error on an LG refrigerator a safety concern?
An IPM fault involving a burnt component or short circuit on the compressor drive board can present a risk if the refrigerator continues to operate in that condition. It is advisable to unplug the unit if you notice any burning smell, visible scorch marks on the back panel, or if the error persists after a reset. A qualified technician should inspect the board before the appliance is returned to regular use.
How much does it cost to repair an IPM error on an LG refrigerator?
Repair costs vary depending on which component has failed. Replacement of the compressor drive PCB typically falls in the range of $150 to $400 for parts alone, with additional labor costs depending on your service provider. If the fault has also damaged the inverter compressor, total repair costs can be significantly higher and may approach or exceed the value of an older unit. Getting a diagnostic assessment before committing to repairs is recommended.

Related LG refrigerator codes

All LG refrigerator codes
View all 485 LG refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass