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Error code reference

LG Refrigerator Error Code 15E

Ice Maker(FF/Fridge) Sensor Error

LG codesLG refrigerator codes

Ice Maker(FF/Fridge) Sensor Error — sensor housing separation, contact error, disconnection, or short circuit.

First step from the service manual

Measure voltage between Main PCB CN90-1 and CN90-7; should read between 4.5V and 1.0V.

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

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What 15E means on a LG refrigerator

The 15E error code on an LG refrigerator indicates a fault in the ice maker temperature sensor circuit, specifically the sensor located in the fresh food or fridge compartment ice maker (FF/Fridge designation). This sensor is a thermistor that feeds real-time temperature data to the main PCB, allowing the control board to regulate ice production cycles. When the board detects an out-of-range signal from this sensor, it triggers the 15E code and may suspend ice maker operation to prevent damage.

The fault can originate from four distinct conditions: physical separation of the sensor from its housing, poor or corroded contact at the connector, a broken or disconnected wire in the harness, or a short circuit within the sensor or wiring. The primary diagnostic entry point is measuring voltage between pins CN90-1 and CN90-7 on the main PCB. Under normal operating conditions, this voltage should fall between 1.0V and 4.5V, varying with temperature. A reading outside this range confirms the sensor circuit is not functioning correctly.

Common contributors include connector corrosion from moisture exposure inside the refrigerator compartment, physical damage to the sensor harness from ice buildup or shifting components, and thermistor failure due to age or thermal stress. Because the sensor sits in a cold and sometimes humid environment, connector pin oxidation is a frequent culprit and should be inspected closely before condemning the sensor or the main PCB.

Source: manufacturer service documentation.

Common causes of 15E

  1. 01

    Corroded or loose connector at CN90

    Wiring / connection

    Moisture inside the fridge compartment can oxidize the pins at connector CN90 on the main PCB, causing intermittent or no signal from the sensor. Inspect the connector for discoloration, corrosion, or pins that are not fully seated.

  2. 02

    Sensor housing separation

    Wiring / connection

    The thermistor can physically dislodge from its mounting housing due to ice buildup or vibration, breaking its thermal contact with the compartment. Check that the sensor is fully seated and secure in its housing bracket.

  3. 03

    Broken or disconnected wiring harness

    Part replacement

    The wire harness running from the ice maker sensor to the main PCB can become pinched, cut, or disconnected, interrupting the circuit entirely. Inspect the full length of the harness for visible damage or loose connectors.

  4. 04

    Failed ice maker thermistor

    Part replacement

    The thermistor itself can fail due to age or thermal stress, producing a resistance value outside the acceptable range and causing a voltage reading outside the 1.0V to 4.5V window at CN90. Replacement of the sensor is required if the harness and connectors check out.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor, harness, and connectors all test correctly but the voltage at CN90-1 to CN90-7 remains out of range, the main PCB itself may have a damaged input circuit. This is the least common cause and should only be considered after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about 15E

What does 15E mean on a LG refrigerator?
The 15E code indicates an ice maker sensor error in the fresh food or fridge compartment. The refrigerator has detected a problem with the thermistor circuit, which could be caused by sensor separation, a loose or corroded connector, a broken wire, or a short circuit. The main PCB monitors this sensor through connector CN90, and voltage at pins CN90-1 and CN90-7 should read between 1.0V and 4.5V under normal conditions.
Can I fix the 15E error myself?
Some causes of the 15E error are DIY-friendly. Checking the sensor harness for visible damage, reseating connectors, and cleaning corroded pins at CN90 do not require special tools. However, measuring voltage at the main PCB connector requires a multimeter and basic electrical knowledge. If the thermistor or main PCB needs replacement, comfort with appliance disassembly is necessary.
Will resetting my LG refrigerator clear the 15E error?
A power reset may temporarily clear the 15E code, but the error will return if the underlying sensor fault has not been corrected. Resetting the unit is useful for confirming whether the fault is intermittent or persistent, but it should not be relied on as a fix. The sensor circuit must be diagnosed and repaired to permanently resolve the code.
Is the 15E error dangerous, and is it safe to continue using the refrigerator?
The 15E error does not indicate a safety hazard such as a fire or electrical shock risk under normal circumstances. However, the ice maker may stop functioning correctly while the fault is active, and food stored in the fridge section should be monitored to confirm temperatures remain stable. It is best to address the error promptly to avoid further issues with the ice maker system.
How much does it cost to repair an LG refrigerator showing a 15E error?
Repair costs vary depending on the root cause. If only the ice maker thermistor needs replacement, parts typically range from $15 to $50, with professional labor adding $75 to $150. If the main PCB is at fault, parts alone can range from $100 to $300 or more. Cleaning corroded connectors yourself costs nothing beyond a contact cleaner product.

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