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Error code reference

Daewoo Refrigerator Error Code D1

D-sensor (defrost sensor) malfunction due to short circuit, wire disconnection, or D-sensor temperature over…

Daewoo codesDaewoo refrigerator codes

D-sensor (defrost sensor) malfunction due to short circuit, wire disconnection, or D-sensor temperature over -5°C while compressor is off.

First step from the service manual

Check D-sensor for short circuit or wire disconnection; heater turns on for 45 minutes irrespective of D-sensor, R-fan can be on/off by R1-sensor only when compressor is on.

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

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What D1 means on a Daewoo refrigerator

The D1 error code on a Daewoo refrigerator indicates a malfunction in the D-sensor, which is the defrost sensor responsible for monitoring evaporator temperature during the defrost cycle. This sensor plays a critical role in signaling when defrost is complete and protecting the system from overheating. The D1 code triggers under three specific conditions: a short circuit in the sensor circuit, a wire disconnection between the sensor and the control board, or a sensor reading above -5°C while the compressor is in the off state, which suggests the sensor is out of range or providing inaccurate thermal data.

When the D1 fault is active, the refrigerator enters a failsafe defrost mode. The heater activates for a fixed 45-minute cycle regardless of what temperature the D-sensor is reading, because the control board can no longer trust the sensor input. During this period, the R-fan (evaporator fan) behavior changes as well: it will only operate based on the R1-sensor signal, and only when the compressor is running. This means the system continues to function in a degraded but controlled manner while the fault persists.

Diagnosing D1 begins with a physical inspection of the D-sensor and its wiring harness. Technicians should check for visible wire damage, corrosion at the connector pins, or breaks in the circuit. A short circuit can be confirmed with a continuity test, while an open circuit indicates a disconnection. If the wiring appears intact, the sensor itself should be tested for proper resistance values at known temperatures to determine whether it has failed internally.

Source: manufacturer service documentation.

Common causes of D1

  1. 01

    D-sensor wire disconnection

    Wiring / connection

    A break or loose connection in the wiring between the D-sensor and the control board is one of the most frequent causes of D1. Inspect the full length of the sensor harness and the connector pins for any separation or looseness.

  2. 02

    D-sensor short circuit

    Part replacement

    A short circuit in the sensor wiring or at the sensor itself will cause the control board to register a fault immediately. Use a multimeter to check for unintended continuity between wires or between a wire and ground.

  3. 03

    Failed D-sensor

    Part replacement

    The defrost sensor can fail internally, causing it to read temperatures above -5°C even when the compressor is off and the evaporator should be cold. A failed sensor will need to be replaced.

  4. 04

    Corrosion or moisture damage at connector

    Wiring / connection

    Moisture inside the freezer compartment can cause corrosion at the sensor connector, leading to high resistance or intermittent open-circuit conditions. Check the connector carefully for rust, green oxidation, or water intrusion.

  5. 05

    Control board fault

    Part replacement

    If the sensor and wiring both test correctly, the control board input circuit for the D-sensor may be faulty. This is the least common cause but should be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about D1

What does D1 mean on a Daewoo refrigerator?
D1 on a Daewoo refrigerator indicates a malfunction with the D-sensor, also called the defrost sensor. The fault is triggered by a short circuit, a wiring disconnection, or a sensor temperature reading above -5°C while the compressor is off. When this code appears, the refrigerator switches to a timed 45-minute defrost cycle and adjusts fan operation to compensate for the lost sensor input.
Can I fix the D1 error myself?
A knowledgeable DIYer can handle basic diagnostics such as inspecting the wiring harness and connector for visible damage, breaks, or corrosion. Testing the sensor with a multimeter for a short circuit or open circuit is also within reach for those comfortable with electrical testing. However, if the sensor or control board needs replacement, some comfort with appliance disassembly is required, and professional service is recommended if you are unsure.
Is it safe to keep using my refrigerator while the D1 code is active?
The refrigerator does enter a failsafe mode when D1 is active, running the defrost heater on a fixed timer and limiting fan operation. Short-term use is generally possible, but running in this degraded mode for an extended period can lead to improper defrost cycles, ice buildup, and potential food spoilage. It is best to diagnose and repair the fault as soon as possible.
How much does it cost to fix a D1 error on a Daewoo refrigerator?
If the issue is simply a loose or damaged wire, repair costs may be minimal, covering only labor or a small connector repair. Replacing the defrost sensor typically costs between $20 and $75 for the part, plus any labor charges. If the control board is at fault, parts alone can range from $80 to $200 or more depending on the model. Diagnosis by a technician usually adds a service fee of $50 to $100.
Will resetting the refrigerator clear the D1 error code?
Unplugging the refrigerator and restoring power may temporarily clear the D1 code from the display, but the fault will return if the underlying problem with the D-sensor or its wiring has not been resolved. A reset does not fix a short circuit, broken wire, or failed sensor. Permanent resolution requires identifying and correcting the root cause before the error will stay cleared.

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