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Error code reference

LG Refrigerator Error Code CSE

Multi-use room (Magic room) temperature sensor open or short circuit.

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Multi-use room (Magic room) temperature sensor open or short circuit.

First step from the service manual

Check the sensor and corresponding connectors.

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

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What CSE means on a LG refrigerator

The CSE error code on an LG refrigerator indicates a fault in the temperature sensor circuit for the Multi-use room, also referred to as the Magic room. This compartment is a flexible-temperature zone that can be set to different modes depending on storage needs. The error is triggered when the refrigerator's control board detects either an open circuit or a short circuit condition in the sensor assigned to monitor that zone's temperature. An open circuit means the signal wire is broken or disconnected, while a short circuit means the sensor's resistance has collapsed, causing abnormal voltage readings that fall outside the expected operating range.

Temperature sensors in LG refrigerators are typically negative temperature coefficient (NTC) thermistors, which change resistance in a predictable way as temperature changes. When the control board reads a resistance value that is too high (open) or too low (short), it flags the CSE code and may disable or limit function in that compartment. The sensor itself and its wiring harness are the primary components involved in this fault.

Diagnosis begins with a visual inspection of the sensor and its corresponding connectors. Technicians should check for damaged insulation, corroded connector pins, or loose wiring at the sensor plug and at the control board connector. If the wiring checks out, the sensor itself should be tested for proper resistance using a multimeter, and compared against the expected resistance range for the ambient temperature. A failed sensor will need to be replaced to clear the fault.

Source: manufacturer service documentation.

Common causes of CSE

  1. 01

    Faulty or failed temperature sensor

    Part replacement

    The NTC thermistor sensor itself can fail internally, resulting in a resistance reading that is out of range. Testing the sensor with a multimeter will reveal an open or shorted reading that does not correspond to the current temperature.

  2. 02

    Loose or disconnected connector

    Wiring / connection

    The sensor's wiring harness connector may have come loose from the sensor plug or from the control board. Inspecting and firmly reseating all connectors in the sensor circuit can resolve this without parts replacement.

  3. 03

    Damaged or broken wiring harness

    Part replacement

    Physical damage to the wiring between the sensor and the control board, such as pinched, frayed, or broken wires, can create an open circuit. A visual inspection along the full wire route and continuity testing will identify the break.

  4. 04

    Corroded connector pins

    Part replacement

    Moisture exposure inside the refrigerator can cause corrosion on the connector pins, increasing resistance or breaking the circuit entirely. Corroded pins will appear discolored and may require connector or harness replacement.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the main control board may misread or fail to properly process the sensor signal even when the sensor and wiring are intact. This should only be considered after ruling out all sensor and wiring issues.

See the test procedure for each cause

Frequently asked questions about CSE

What does CSE mean on a LG refrigerator?
The CSE code on an LG refrigerator indicates that the temperature sensor for the Multi-use room, also called the Magic room, has an open or short circuit condition. The control board is detecting an abnormal signal from that sensor, meaning it cannot accurately read the temperature in that compartment. This can affect the performance and temperature control of that flexible storage zone.
Can I fix the CSE error myself?
A knowledgeable DIYer can attempt to resolve this by inspecting and reseating the sensor connectors, which requires no special tools. If the connector is secure and the error persists, testing the sensor's resistance with a multimeter is the next step. Replacing the sensor is a moderately straightforward repair, though accessing the sensor may require removing interior panels in the Multi-use room compartment.
Is it safe to keep using my refrigerator with a CSE error?
The CSE error specifically affects the Multi-use room zone, so the main refrigerator and freezer compartments may continue operating normally. However, the Multi-use room may not maintain accurate temperatures, which could lead to food spoilage in that section. It is advisable to avoid storing perishables in that compartment until the fault is resolved.
How much does it cost to repair a CSE error on an LG refrigerator?
If the repair only requires reseating a connector, there is no parts cost involved. Replacing the temperature sensor itself typically involves a parts cost in the range of $15 to $50 depending on the specific model. If a technician is needed for diagnosis and repair, labor costs will add to that total, generally bringing the full repair into the $100 to $250 range.
Will resetting my LG refrigerator clear the CSE error code?
A power reset may temporarily clear the CSE code, but the error will return if the underlying sensor or wiring fault has not been corrected. Unplugging the refrigerator for a few minutes and restoring power resets the control board, but the code will reappear once the board re-detects the abnormal sensor signal. A permanent fix requires identifying and correcting the open or short circuit condition in the sensor circuit.

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