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Error code reference

LG Refrigerator Error Code LED 1 time

AD-offset Error on compressor PCB

LG codesLG refrigerator codes

AD-offset Error on compressor PCB - Motor voltage or current sensing defect (CC310 voltage outside 2.2-2.8V).

First step from the service manual

Check normal operation after power reset; if same error occurs, replace PCB.

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

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  • 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
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What LED 1 time means on a LG refrigerator

The LED 1 time error on an LG refrigerator indicates an AD-offset error on the compressor PCB, which relates to a defect in the motor voltage or current sensing circuit. Specifically, this fault is triggered when the voltage at reference point CC310 on the compressor control board falls outside the acceptable range of 2.2 to 2.8 volts. This sensing circuit is responsible for accurately monitoring the electrical characteristics of the inverter-driven compressor motor, and any deviation from the expected reference voltage prevents the board from correctly interpreting motor operating conditions.

The AD (analog-to-digital) offset error means the compressor PCB's internal sensing circuitry has detected a calibration or signal integrity problem. The CC310 voltage reference is used by the board's microprocessor to establish a baseline for current and voltage measurements during compressor operation. If this reference drifts below 2.2V or rises above 2.8V, the board flags the condition as a sensing defect rather than risk operating the compressor on faulty data, which could lead to compressor damage.

Common root causes include a failed compressor PCB, transient power disturbances that corrupt the board's calibration state, or internal component degradation on the board itself such as a failed reference voltage component or op-amp. Because the fault is isolated to the compressor PCB's sensing circuit, the diagnostic path is straightforward: a power reset to clear transient faults, followed by PCB replacement if the error persists.

Source: manufacturer service documentation.

Common causes of LED 1 time

  1. 01

    Failed compressor PCB

    Part replacement

    The compressor control board itself is the most likely cause when the CC310 reference voltage is out of the 2.2 to 2.8V range. Internal component failure on the board, such as a degraded voltage reference circuit, produces a persistent AD-offset error that a power reset will not resolve.

  2. 02

    Transient power disturbance

    Wiring / connection

    A momentary power surge, sag, or outage can corrupt the compressor PCB's calibration state and trigger a one-time AD-offset fault. If the error clears after a full power reset and does not return, a transient power event is the likely explanation.

  3. 03

    Loose or corroded wiring connections to the compressor PCB

    Wiring / connection

    Poor electrical connections at the compressor PCB harness connectors can introduce noise or voltage drops into the sensing circuit, causing the CC310 reference to read outside the acceptable window. Inspect all connector pins at the board for corrosion, looseness, or damage.

  4. 04

    Compressor winding or motor fault feeding back into sensing circuit

    Part replacement

    A degraded compressor motor with abnormal current draw can place unusual electrical loads on the PCB sensing circuit, potentially pulling the CC310 reference voltage out of range. This is less common but worth considering if the PCB replacement does not resolve the fault.

See the test procedure for each cause

Frequently asked questions about LED 1 time

What does LED 1 time mean on a LG refrigerator?
The LED 1 time error indicates an AD-offset error on the compressor PCB, meaning the board's motor voltage or current sensing circuit has detected a problem. Specifically, the reference voltage at point CC310 on the compressor control board has fallen outside the required 2.2 to 2.8V range. The board flags this condition to prevent running the compressor on faulty sensor data. In most cases, the compressor PCB will need to be replaced.
Will resetting the refrigerator clear the LED 1 time error?
A power reset is always the first recommended step because a transient electrical disturbance can sometimes cause a one-time AD-offset fault. Unplug the refrigerator for a few minutes, then restore power and monitor for recurrence. If the LED 1 time error returns after the reset, the compressor PCB has a persistent fault and will need to be replaced.
How do I fix the LED 1 time error on my LG refrigerator?
Start by performing a full power reset by unplugging the unit for several minutes. If the error does not return, no further action may be needed. If the error reappears, the compressor PCB requires replacement, as the internal sensing circuit responsible for monitoring CC310 reference voltage is faulty. A qualified technician should handle PCB replacement to ensure correct installation and safe handling of the inverter compressor system.
Is it safe to keep using my LG refrigerator when the LED 1 time error is active?
When this error is active, the compressor PCB has detected a sensing defect and may restrict or shut down compressor operation to protect the system. This means the refrigerator may not be maintaining proper temperatures, putting stored food at risk. It is not advisable to rely on the unit for food storage until the fault is diagnosed and resolved.
How much does it cost to fix a LED 1 time error on an LG refrigerator?
Repair costs vary depending on the model, parts availability, and labor rates in your area. A replacement compressor PCB for an LG refrigerator typically ranges from around 80 to 250 dollars for the part alone. Adding professional labor, total repair costs generally fall in the range of 150 to 400 dollars. Getting a diagnostic appointment from an authorized technician will provide a more accurate estimate for your specific model.

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