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Error code reference

Daewoo Freezer Error Code C1

Compressor runs over 3 hours when D-Sensor temperature is at or above -5°C (23°F), indicating possible sealed…

Daewoo codesDaewoo freezer codes

Compressor runs over 3 hours when D-Sensor temperature is at or above -5°C (23°F), indicating possible sealed system issue.

First step from the service manual

Check for possible sealed system issue; error code resets when D-sensor temperature is under -5°C (23°F) and compressor is off.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What C1 means on a Daewoo freezer

The C1 error code on a Daewoo freezer indicates that the compressor has been running continuously for more than 3 hours while the D-sensor (defrost sensor) is reading a temperature at or above -5°C (23°F). Under normal operation, a freezer compressor cycles on and off as the cabinet reaches its target temperature. When the compressor cannot bring the D-sensor reading below -5°C within 3 hours, the control board interprets this as a failure to achieve proper cooling and triggers the C1 alert.

The D-sensor monitors temperature within the sealed system circuit, and its reading above -5°C during extended compressor run time is a strong indicator of a sealed system problem. Sealed system issues include refrigerant loss due to a leak, a blocked or restricted refrigerant circuit, or a failed compressor that is running but not pumping refrigerant effectively. Any of these conditions will prevent the system from reaching the target evaporator temperature regardless of how long the compressor operates.

The C1 code will automatically reset once two conditions are met simultaneously: the D-sensor temperature drops below -5°C and the compressor is in its off cycle. If the unit recovers and meets these conditions, the code clears on its own. However, if the underlying sealed system problem is not corrected, the code will return. Because sealed system repairs involve refrigerant handling and specialized equipment, this type of diagnosis and repair typically requires a certified technician.

Source: manufacturer service documentation.

Common causes of C1

  1. 01

    Refrigerant leak

    Part replacement

    A leak in the sealed system allows refrigerant to escape, reducing the system's ability to transfer heat and cool the cabinet. Signs include the compressor running constantly with little or no cooling effect inside the freezer.

  2. 02

    Failed or weak compressor

    Part replacement

    The compressor may be running electrically but failing to build adequate pressure to circulate refrigerant through the system. The unit will sound like it is operating normally but will not achieve proper temperatures.

  3. 03

    Refrigerant restriction or blockage

    Part replacement

    A blockage or restriction in the refrigerant circuit, such as a clogged capillary tube or filter drier, can prevent proper refrigerant flow even if the charge is intact. This requires sealed system access to diagnose and clear.

  4. 04

    Faulty D-sensor

    Part replacement

    If the D-sensor itself is malfunctioning and reporting incorrect high temperatures, the control board may trigger C1 even when the sealed system is operating correctly. Verify sensor readings against actual evaporator temperatures before pursuing sealed system repairs.

  5. 05

    Poor door seal or excessive ambient heat

    Wiring / connection

    A damaged or poorly sealing door gasket, or an installation environment with very high ambient temperatures, can cause the compressor to run for extended periods without reaching target temperatures. Inspect the door gasket for gaps, tears, or areas that do not contact the cabinet evenly.

See the test procedure for each cause

Frequently asked questions about C1

What does C1 mean on a Daewoo freezer?
The C1 code means the compressor has been running continuously for more than 3 hours while the D-sensor temperature remains at or above -5°C (23°F). This tells the control board that the freezer is not reaching its target cooling level within an expected timeframe. It is a diagnostic indicator pointing toward a possible sealed system issue such as a refrigerant leak, compressor failure, or refrigerant restriction.
Can I fix the C1 error on my Daewoo freezer myself?
Most causes behind the C1 code involve the sealed refrigerant system, which requires specialized equipment and certification to work on legally and safely. You can check for obvious issues like a damaged door gasket or blocked vents, but refrigerant leaks, compressor problems, and system restrictions are not DIY repairs. A certified appliance technician with refrigerant handling credentials is needed for sealed system work.
Will resetting the freezer clear the C1 error code?
The C1 code resets automatically once the D-sensor temperature drops below -5°C and the compressor is in its off cycle. Simply unplugging the unit may temporarily clear the display, but if the underlying sealed system problem is not resolved, the code will return once the compressor runs for another 3 hours without achieving the target temperature. A reset does not fix the root cause.
Is it safe to keep using my Daewoo freezer when the C1 code is showing?
A C1 code means the freezer is not cooling properly, so food stored inside may not be maintained at a safe temperature. Perishable and frozen items are at risk of spoilage if the freezer cannot reach or hold proper freezing temperatures. It is advisable to transfer food to another freezer or use coolers with ice while the unit is being diagnosed and repaired.
How much does it cost to repair a Daewoo freezer showing a C1 error?
Repair costs depend on the specific cause identified. A door gasket replacement is typically in the range of $50 to $150 including parts and labor. Sealed system repairs such as refrigerant recharge or leak repair can range from $150 to $400 or more depending on the extent of the work. Compressor replacement is generally the most expensive option, often ranging from $300 to $600 or higher depending on parts availability and labor rates in your area.

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