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Error code reference

Daewoo Freezer Error Code D1

D-Sensor disconnection or short circuit.

Daewoo codesDaewoo freezer codes

D-Sensor disconnection or short circuit.

First step from the service manual

Measure the voltage between terminal PIN 1 and 2 of CN5 on the Main PCB; if under 0.5V there is a short in the sensor circuit, if over 4.7V there is an open in the sensor circuit.

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 freezer

The D1 error code on a Daewoo freezer indicates a fault in the D-Sensor circuit, which is a temperature sensor responsible for monitoring a specific thermal zone within the freezer system. This error is triggered when the main PCB detects either a short circuit or an open circuit (disconnection) in the sensor wiring. Temperature sensors in freezer systems typically operate as negative temperature coefficient (NTC) thermistors, meaning their resistance changes predictably with temperature. A fault in this circuit prevents the control board from receiving accurate temperature data, which can compromise the unit's ability to regulate cooling properly.

The primary diagnostic procedure involves measuring the voltage at connector CN5 on the Main PCB, specifically between PIN 1 and PIN 2. A reading below 0.5V indicates a short circuit condition in the sensor circuit, where the sensor or wiring is creating an unintended low-resistance path to ground. A reading above 4.7V points to an open circuit condition, meaning the sensor has failed internally or the wiring harness has a break, connector pull-out, or corroded terminal that is interrupting the signal path. Normal sensor operation falls between these two voltage thresholds.

Common root causes include physical damage to the sensor wiring harness from ice buildup, a failed thermistor element within the sensor itself, or corroded and loose connector pins at CN5. Because the D-Sensor monitors temperature in a moisture-prone environment, wiring insulation degradation and connector corrosion are frequent contributors to both short and open circuit conditions over time.

Source: manufacturer service documentation.

Common causes of D1

  1. 01

    Failed D-Sensor thermistor

    Part replacement

    The thermistor element inside the D-Sensor can fail open or short internally over time, especially in humid freezer environments. A voltage reading above 4.7V or below 0.5V at CN5 PIN 1 and PIN 2 with an otherwise intact harness points directly to the sensor itself.

  2. 02

    Damaged or broken wiring harness

    Part replacement

    The wiring between the D-Sensor and CN5 on the Main PCB can develop breaks or cuts from ice accumulation, door pinching, or vibration over time. A broken wire will produce an open circuit reading above 4.7V at the connector.

  3. 03

    Corroded or loose connector pins at CN5

    Wiring / connection

    Moisture inside the freezer cabinet can cause the pins at connector CN5 on the Main PCB to corrode or back out of their housing, interrupting the signal. Inspect the connector for green oxidation, bent pins, or a loose fit before replacing any components.

  4. 04

    Short circuit from chafed wire insulation

    Part replacement

    If the sensor wiring harness rubs against a metal edge or is pinched, the insulation can wear through and create an unintended contact to ground, producing a short circuit. This will result in a voltage reading below 0.5V at CN5 PIN 1 and PIN 2.

  5. 05

    Faulty Main PCB sensor input circuit

    Part replacement

    In less common cases, the sensor input circuitry on the Main PCB itself may be damaged, causing incorrect voltage readings even when the sensor and wiring are intact. This should only be suspected after confirming the sensor and harness test correctly.

See the test procedure for each cause

Frequently asked questions about D1

What does D1 mean on a Daewoo freezer?
The D1 error code on a Daewoo freezer indicates a problem with the D-Sensor circuit, specifically a disconnection (open circuit) or a short circuit in the sensor wiring. The main PCB monitors the voltage at connector CN5 between PIN 1 and PIN 2 to detect the fault. A reading below 0.5V means a short is present, while a reading above 4.7V means the circuit is open. This prevents the control board from reading accurate temperature data from that sensor zone.
Can I fix a Daewoo freezer D1 error myself?
A knowledgeable DIYer can perform basic diagnostics such as inspecting the wiring harness for visible damage, checking the CN5 connector for corrosion or loose pins, and measuring the voltage at PIN 1 and PIN 2 of CN5 with a multimeter. If the sensor wiring is intact and the connector is secure but the voltage is still out of range, replacing the D-Sensor thermistor is often the next step. Working on the Main PCB or tracing internal wiring faults is best left to a qualified appliance technician.
Is it safe to keep using my Daewoo freezer while the D1 error is showing?
Continued use with a D1 error is not recommended, because the freezer may be unable to accurately regulate the temperature in the affected zone. This could result in food not being kept at a safe freezing temperature, increasing the risk of spoilage. It is best to transfer perishable items to another freezer and address the fault promptly.
Will resetting my Daewoo freezer clear the D1 error code?
A power reset may temporarily clear the D1 error from the display, but the code will return as soon as the control board runs its sensor check and detects the same fault condition again. The underlying cause, whether a failed sensor, broken wire, or corroded connector, must be physically repaired or the faulty component replaced before the error will stay cleared.
How much does it cost to repair a Daewoo freezer D1 error?
Repair costs vary depending on the root cause. Replacing the D-Sensor thermistor is generally one of the lower-cost repairs, with parts typically in the range of $15 to $50 and labor costs adding $75 to $150 depending on the service provider. If the Main PCB requires replacement, costs can rise significantly, often ranging from $150 to $350 or more for parts and labor combined. Getting a diagnostic estimate before authorizing repairs is advisable.

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