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Error code reference

LG Refrigerator Error Code 01

Ice Maker sensor error

LG codesLG refrigerator codes

Ice Maker sensor error - connector missing, contact failure, wire cut, short circuit, or sensor failure.

First step from the service manual

Check voltage between MAIN PCB CN90 #3 (WHITE) and #8 (GRAY); should be within 4.5V~1.0V.

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
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What 01 means on a LG refrigerator

Error code 01 on an LG refrigerator indicates a fault within the ice maker temperature sensor circuit. This sensor, also called the ice maker thermistor, monitors the temperature inside the ice maker assembly to regulate the freezing and harvesting cycles. When the control system detects an abnormal signal from this sensor, it triggers code 01 and may suspend ice production to prevent mechanical damage or improper operation.

The root causes fall into several categories: a missing or disconnected connector at the sensor harness, contact failure due to corrosion or looseness at the pin terminals, a cut or broken wire in the sensor wiring harness, a short circuit within the wiring or at the sensor itself, or complete sensor failure. The primary diagnostic step is to measure the voltage between pin 3 (WHITE wire) and pin 8 (GRAY wire) on connector CN90 of the main PCB. A healthy sensor circuit will produce a voltage reading that falls within the 4.5V to 1.0V range, varying with temperature. A reading outside this range, or no reading at all, points toward a wiring or sensor fault.

Because this code covers a spectrum of failure modes, from a simple loose connector to a failed thermistor, a systematic inspection is required. Begin at the connector and work toward the sensor, checking for physical damage, pin corrosion, and continuity before condemning the sensor itself. Resistance across a properly functioning ice maker thermistor will shift predictably with temperature, so cross-referencing resistance values at a known temperature can help confirm sensor integrity before ordering replacement parts.

Source: manufacturer service documentation.

Common causes of 01

  1. 01

    Disconnected or missing connector

    Wiring / connection

    The sensor harness connector at CN90 on the main PCB or at the sensor itself may have come loose or been left disconnected after a previous repair. Inspect both ends of the connector for a secure, fully seated fit.

  2. 02

    Contact failure at connector pins

    Wiring / connection

    Corrosion, moisture, or bent pins inside the connector can cause intermittent or complete loss of signal. Inspect the WHITE (pin 3) and GRAY (pin 8) terminals on CN90 for discoloration, oxidation, or deformation.

  3. 03

    Cut or damaged wiring harness

    Part replacement

    The wire running from the main PCB to the ice maker sensor can be pinched, abraded, or cut, particularly where it routes through hinges or sharp cabinet edges. A continuity test along the full harness length will identify a break.

  4. 04

    Short circuit in the sensor circuit

    Part replacement

    A short can occur if damaged wire insulation allows two conductors to contact each other or contact the chassis ground. This will typically produce a voltage reading well outside the 4.5V to 1.0V expected range.

  5. 05

    Failed ice maker thermistor

    Part replacement

    The sensor itself can fail internally, producing a fixed, out-of-range resistance value or no signal at all. If wiring and connectors check out correctly, the thermistor should be tested and replaced if its resistance does not correspond to its actual temperature.

See the test procedure for each cause

Frequently asked questions about 01

What does 01 mean on a LG refrigerator?
Error code 01 on an LG refrigerator indicates an ice maker sensor error. The control board has detected a problem with the temperature sensor circuit in the ice maker, which could be caused by a loose connector, damaged wiring, a short circuit, or a failed sensor. The refrigerator's cooling system typically continues to operate, but ice production may be affected.
Can I fix error code 01 on my LG refrigerator myself?
Some causes of error code 01 are within reach for a confident DIYer, such as reseating a loose connector or inspecting visible wiring for obvious damage. More advanced steps, like measuring voltage at CN90 on the main PCB or testing thermistor resistance, require a multimeter and basic electrical knowledge. If the wiring harness or the sensor itself needs replacement, those repairs involve working near refrigerant lines and the ice maker assembly, which may be better handled by a qualified technician.
Is error code 01 on an LG refrigerator a safety concern?
Error code 01 does not typically represent a safety hazard. It is an electrical signal fault in the ice maker sensor circuit and does not involve high-voltage components or refrigerant release under normal circumstances. However, a short circuit in the wiring should be investigated promptly to prevent potential damage to the main PCB or other components.
How much does it cost to repair error code 01 on an LG refrigerator?
Repair costs depend on the specific cause. If only a connector needs reseating or a wiring harness needs minor repair, costs may be minimal, primarily covering a service call ranging from $75 to $150. Replacing the ice maker thermistor typically costs between $20 and $60 for the part, plus labor. If the wiring harness requires full replacement, total repair costs can range from $100 to $300 depending on parts and local labor rates.
Will resetting my LG refrigerator clear error code 01?
A reset, such as unplugging the refrigerator for several minutes, may temporarily clear error code 01, but the code will return if the underlying fault in the sensor circuit has not been resolved. A reset is a useful first step to rule out a transient glitch, but a persistent code 01 requires physical inspection of the connector, wiring, and sensor to find and correct the actual cause.

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