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Error code reference

LG Refrigerator Error Code Po

Abnormal supplied power voltage.

LG codesLG refrigerator codes

Abnormal supplied power voltage.

First step from the service manual

Check input voltage at power cord; verify voltage is within ±85% of rated voltage.

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

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What Po means on a LG refrigerator

The Po error code on an LG refrigerator indicates that the unit is detecting an abnormal supplied power voltage. The refrigerator's control board continuously monitors the incoming AC voltage to ensure it falls within an acceptable operating range. When the measured voltage deviates beyond approximately 85% of the rated supply voltage, either too low or too high, the control board triggers the Po code and may suspend normal operation to protect internal components from damage.

This code is fundamentally a power supply issue rather than a refrigerator component failure. The refrigerator itself may be in perfect working order, but the electrical supply reaching the unit is outside the acceptable tolerance window. Common sources of this problem include utility grid fluctuations, a weak or failing electrical circuit, undersized or damaged wiring in the home, a loose connection at the outlet or breaker panel, or a faulty power cord. In some cases, running the refrigerator on an extension cord or a circuit shared with high-draw appliances can cause transient voltage drops that trigger this code.

Diagnosing the Po code begins at the power cord and wall outlet. Use a multimeter to measure the actual AC voltage at the outlet with the refrigerator plugged in and under load. For a standard 120V North American installation, the voltage should remain close to 120V and must not fall below roughly 102V. Persistent low voltage readings point to a utility supply problem, a failing circuit breaker, or inadequate wiring. High voltage readings above the rated tolerance are less common but equally damaging and should be reported to the utility provider immediately.

Source: manufacturer service documentation.

Common causes of Po

  1. 01

    Low utility supply voltage

    Wiring / connection

    The incoming voltage from the utility grid drops below the acceptable threshold, often during peak demand hours or in areas with aging infrastructure. A multimeter reading at the outlet will confirm if voltage is consistently below the rated level.

  2. 02

    Overloaded or shared circuit

    Wiring / connection

    Running the refrigerator on a circuit shared with other high-draw appliances can cause voltage to sag when those appliances cycle on. Plugging the refrigerator into a dedicated circuit resolves this.

  3. 03

    Loose wiring connection at outlet or panel

    Wiring / connection

    A loose terminal at the wall outlet, breaker, or panel can create resistance that drops the effective voltage reaching the refrigerator. Inspect the outlet for scorching or looseness and have an electrician check the panel connection.

  4. 04

    Damaged or inadequate power cord

    Part replacement

    A frayed, pinched, or undersized power cord can introduce resistance and cause a voltage drop under load. Inspect the full length of the power cord for visible damage and replace it if defects are found.

  5. 05

    Faulty main control board

    Part replacement

    In rare cases, the control board itself may be misreading the incoming voltage due to a failed sensing circuit, triggering a false Po code even when supply voltage is normal. This is typically diagnosed only after all external power sources have been confirmed good.

See the test procedure for each cause

Frequently asked questions about Po

What does Po mean on a LG refrigerator?
The Po code on an LG refrigerator stands for abnormal supplied power voltage. It means the control board has detected that the incoming AC voltage is outside the acceptable operating range, which is approximately within 85% of the rated supply voltage. The refrigerator may stop cooling or limit operation until the voltage returns to a safe level. This is a protective feature designed to prevent damage to the compressor and electronics.
How do I fix the Po error code on my LG refrigerator?
Start by measuring the AC voltage at the wall outlet using a multimeter while the refrigerator is plugged in. The reading should be close to the rated voltage and must not fall outside the 85% tolerance range. If voltage is low or inconsistent, check for a shared or overloaded circuit, a loose outlet or breaker connection, or contact your utility provider if the issue is with the incoming supply. If the outlet voltage is normal, the power cord or control board may need inspection.
Is the Po error code on an LG refrigerator dangerous?
A persistent Po code can indicate an electrical condition that is potentially harmful to both the appliance and your home wiring. Sustained low voltage can cause the compressor to overheat and fail, while high voltage can damage the control board and other electronics. If you see signs of scorching at the outlet, notice burning smells, or the outlet feels warm, stop using it immediately and contact an electrician.
Will resetting my LG refrigerator clear the Po code?
Unplugging the refrigerator for a few minutes and plugging it back in may temporarily clear the Po code, but the error will return if the underlying voltage problem has not been corrected. A reset is only useful as a confirmation step after the power supply issue has been identified and fixed. Do not rely on repeated resets as a solution, as operating with abnormal voltage can cause long-term damage to the compressor and electronics.
How much does it cost to repair a Po error code on an LG refrigerator?
The cost depends entirely on the root cause. If the problem is a shared circuit or a utility supply issue, there may be no parts cost at all, though an electrician visit could range from around $75 to $200 or more depending on labor rates and the work required. Replacing a damaged power cord is typically an inexpensive repair, often in the $20 to $60 range for parts. If the main control board has failed and is triggering a false Po code, board replacement can range from $150 to $400 or more including parts and labor.

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