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Error code reference

Daewoo Refrigerator Error Code E2

Short D-sensor (defrost temperature sensor short circuit detected).

Daewoo codesDaewoo refrigerator codes

Short D-sensor (defrost temperature sensor short circuit detected).

First step from the service manual

Check if the voltage of port 4 in micom is lower than 0.2V; check the connection state of connector C3 on M-PCB; check characteristics of diodes D03, D05.

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

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What E2 means on a Daewoo refrigerator

The E2 error code on a Daewoo refrigerator indicates a short circuit condition in the defrost temperature sensor, commonly called the D-sensor. This sensor is a thermistor located in the evaporator compartment and is responsible for monitoring temperatures during the defrost cycle. When the sensor shorts internally or through wiring, it causes an abnormally low resistance reading, which pulls the voltage at port 4 of the microcomputer (micom) below the normal operating threshold. A reading below 0.2V at that port signals to the control board that the sensor circuit has collapsed, triggering the E2 fault.

The diagnostic process focuses on three key areas: the micom port voltage, the wiring connector, and protective diodes on the main PCB. Connector C3 on the M-PCB is the interface point between the sensor wiring harness and the control board, and poor contact or moisture intrusion at this connector can create a short path that mimics a failed sensor. Diodes D03 and D05 on the M-PCB are also implicated, as a failed diode can allow voltage to collapse on the sensor input line, generating the same fault signal even when the sensor itself is intact.

Common root causes include a physically damaged or water-logged D-sensor, a pinched or shorted sensor wire harness, corroded connector pins at C3, or a failed diode on the main control board. Because the E2 code can originate at the sensor, the wiring, the connector, or the board itself, a systematic voltage and continuity check is required to isolate the actual failure point before replacing any components.

Source: manufacturer service documentation.

Common causes of E2

  1. 01

    Shorted or failed defrost temperature sensor (D-sensor)

    Part replacement

    The thermistor itself can fail internally, creating a direct short that collapses the voltage at the micom input port. This is the most frequent cause and can be confirmed by disconnecting the sensor and measuring its resistance.

  2. 02

    Damaged or pinched sensor wiring harness

    Part replacement

    The wiring between the D-sensor and the M-PCB can become pinched, frayed, or abraded, causing two conductors to contact each other and create a short circuit. Inspect the full length of the harness for visible damage or chafing against metal edges.

  3. 03

    Loose or corroded connector C3 on the M-PCB

    Wiring / connection

    Connector C3 is the junction between the sensor harness and the main control board. Corrosion, moisture intrusion, or a loose seating at this connector can create abnormal resistance or a short condition. Inspect the connector pins for oxidation and reseat the connector firmly.

  4. 04

    Failed diode D03 or D05 on the M-PCB

    Part replacement

    Diodes D03 and D05 are part of the sensor input circuit on the main control board. A shorted diode can pull the voltage at micom port 4 below 0.2V even when the sensor and wiring are healthy. Testing these diodes in-circuit or out-of-circuit with a multimeter in diode mode will confirm a failure.

  5. 05

    Moisture or ice contamination at the sensor or connector

    Wiring / connection

    Water from a heavy frost buildup or a condensation leak can bridge connector contacts or sensor terminals, simulating a short circuit. After a manual defrost and thorough drying of the evaporator compartment, the code may clear if no physical component damage occurred.

See the test procedure for each cause

Frequently asked questions about E2

What does E2 mean on a Daewoo refrigerator?
The E2 code on a Daewoo refrigerator means the control system has detected a short circuit in the defrost temperature sensor (D-sensor). The microcomputer monitors the voltage at a dedicated input port, and when that voltage drops below 0.2V, it registers the sensor circuit as shorted and displays E2. The fault can originate at the sensor itself, the wiring harness, connector C3 on the main PCB, or diodes D03 and D05 on the control board.
Can I fix the E2 error on my Daewoo refrigerator myself?
Some causes of the E2 error, such as a loose connector at C3, can be resolved by carefully reseating the connector after unplugging the refrigerator. However, testing the micom port voltage, measuring sensor resistance, and evaluating diodes on the M-PCB requires a multimeter and familiarity with electronics. If you are not comfortable working with circuit boards or tracing wiring harnesses inside the refrigerator cabinet, professional service is the safer route.
Is it safe to keep using my refrigerator while it shows the E2 error?
A shorted D-sensor means the refrigerator's defrost cycle may not operate correctly, which can lead to excessive frost accumulation on the evaporator coil over time. This frost buildup will eventually block airflow and reduce cooling performance. While the refrigerator is not immediately dangerous to operate, continued use without addressing the fault risks food spoilage and potential damage to the compressor from restricted airflow.
Will resetting the refrigerator clear the E2 error code?
Unplugging the refrigerator for a few minutes and restoring power may temporarily clear the displayed code, but the E2 fault will return as soon as the control board re-checks the sensor circuit if the underlying short still exists. A reset does not repair a failed sensor, damaged wiring, or a faulty diode. Permanent resolution requires identifying and correcting the actual fault in the D-sensor circuit.
How much does it cost to repair a Daewoo refrigerator E2 error?
Repair costs vary depending on which component has failed. A replacement defrost temperature sensor typically costs in the range of $15 to $40 for the part alone. If the main PCB requires diode-level repair or full board replacement, parts and labor can range from $80 to $200 or more. Adding a service call fee, total repair costs generally fall between $100 and $300 depending on the technician's rates and the extent of the damage.

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