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Error code reference

Daewoo Refrigerator Error Code EI

I-sensor (ice sensor) disconnection or short circuit.

Daewoo codesDaewoo refrigerator codes

I-sensor (ice sensor) disconnection or short circuit.

First step from the service manual

Measure the resistance between both terminals after separating CN11 of the Main PCB. If disconnected or shorted, change the I-sensor in the automatic ice maker.

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

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What EI means on a Daewoo refrigerator

The EI error code on a Daewoo refrigerator indicates a fault detected in the I-sensor, also called the ice sensor, located within the automatic ice maker assembly. This sensor monitors conditions inside the ice maker and communicates that data back to the Main PCB. When the control board detects either a disconnection (open circuit) or a short circuit in the sensor circuit, it triggers the EI code and typically halts ice production to prevent damage or unsafe operation.

Diagnosing this fault begins at connector CN11 on the Main PCB. After separating CN11, a technician measures resistance across both terminals of the I-sensor circuit. An open circuit reading (effectively infinite resistance) points to a broken wire, a failed sensor, or a disconnected harness plug. A short circuit reading (near-zero resistance) suggests the sensor internals have failed or the wiring harness has been pinched or damaged to the point where conductors are making unintended contact.

The most direct fix when either condition is confirmed through resistance testing is replacement of the I-sensor in the automatic ice maker. Because the sensor is integrated into the ice maker assembly, technicians should also inspect the wiring harness routing from the ice maker to CN11 on the Main PCB for any visible damage, corrosion at connector pins, or loose terminal crimps before condemning the sensor itself. A wiring fault can produce the same readings as a failed sensor.

Source: manufacturer service documentation.

Common causes of EI

  1. 01

    Failed I-sensor

    Part replacement

    The ice sensor itself has developed an internal open or short circuit. This is confirmed by measuring resistance at CN11 after disconnecting the connector and finding readings outside normal range.

  2. 02

    Disconnected wiring harness

    Wiring / connection

    The connector or wiring harness linking the I-sensor to CN11 on the Main PCB has come loose. Visually inspecting the connector at the ice maker and at the Main PCB can identify this quickly.

  3. 03

    Damaged wiring between ice maker and Main PCB

    Part replacement

    Wire insulation that has been pinched, chafed, or exposed to moisture can cause a short circuit in the sensor circuit. Inspect the full harness run for visible damage or corrosion.

  4. 04

    Corroded or loose connector pins at CN11

    Wiring / connection

    Corrosion or a bent terminal inside the CN11 connector on the Main PCB can interrupt the sensor signal. Cleaning the pins or reseating the connector may resolve the fault if no other damage is present.

  5. 05

    Faulty Main PCB

    Part replacement

    If the I-sensor and all wiring test within normal limits, the CN11 input circuit on the Main PCB itself may have failed. This is the least common cause and is typically diagnosed after all other possibilities are ruled out.

See the test procedure for each cause

Frequently asked questions about EI

What does EI mean on a Daewoo refrigerator?
EI indicates a problem with the I-sensor, or ice sensor, in the automatic ice maker. The Main PCB has detected either a disconnection or a short circuit in that sensor circuit. The code is triggered when resistance measured at connector CN11 falls outside acceptable limits, and it typically causes the ice maker to stop functioning.
Can I fix the EI error code myself?
A knowledgeable DIYer can start by checking whether the wiring harness to the ice maker is fully connected and free of visible damage, since a loose connector is sometimes all that is involved. Proper diagnosis beyond that requires a multimeter to measure resistance at CN11 on the Main PCB after separating the connector. If the sensor itself is faulty, replacing the I-sensor in the ice maker is the recommended repair.
Is it safe to keep using my refrigerator while the EI code is showing?
The refrigerator compartment and freezer will generally continue cooling, but the automatic ice maker will not operate reliably while this fault is active. There is no immediate safety hazard to food stored in the unit, but you should avoid relying on the ice maker until the fault is resolved.
How much does it cost to repair the EI error code on a Daewoo refrigerator?
If only the I-sensor needs replacement, parts and labor typically range from around $75 to $200 depending on your location and parts availability. If the wiring harness requires repair or replacement, costs can be similar in range. A Main PCB replacement, if needed, would be at the higher end of repair costs and could range from $150 to $400 or more.
Will resetting the refrigerator clear the EI error code?
A power reset may temporarily clear the code from the display, but the EI error will return if the underlying fault with the I-sensor or its wiring has not been corrected. The Main PCB continuously monitors the sensor circuit, so any ongoing disconnection or short circuit will cause the code to reappear. A permanent fix requires addressing the root cause through resistance testing and component repair or replacement.

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