mypros+
Error code reference

Daewoo Refrigerator Error Code C1

Cooling cycle/compressor malfunction

Daewoo codesDaewoo refrigerator codes

Cooling cycle/compressor malfunction - D-sensor temperature is over -5°C although the compressor has been running for 3 hours non-stop (checked after first defrost mode).

First step from the service manual

Check refrigerant charge, compressor operation, sealed system, and airflow. Normal operation continues.

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

MyPros+ Max

Get the full diagnostic procedure for C1.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What C1 means on a Daewoo refrigerator

The C1 error code on a Daewoo refrigerator indicates a cooling cycle or compressor malfunction detected after the first defrost cycle completes. Specifically, the control board monitors the D-sensor (defrost sensor) temperature and expects it to drop well below -5°C after the compressor has been running continuously for 3 hours. When the D-sensor reads above -5°C at that checkpoint, the system flags C1 because the refrigerant circuit is not achieving adequate cooling despite sustained compressor operation.

The root cause typically lies within the sealed refrigeration system. Insufficient refrigerant charge is a primary suspect, as low refrigerant reduces the system's ability to absorb and transfer heat efficiently, leaving evaporator temperatures higher than expected. Beyond refrigerant level, a failing compressor that runs but delivers low compression, a restriction or blockage in the refrigerant circuit, or a failed condenser or evaporator fan reducing airflow can all produce the same symptom: the compressor runs but the evaporator never gets cold enough to satisfy the D-sensor threshold.

It is worth noting that the refrigerator continues normal operation while displaying C1, meaning the code is diagnostic rather than a shutdown trigger. Technicians should begin by verifying refrigerant charge using manifold gauges, checking compressor amp draw and compression output, inspecting evaporator and condenser fan motors for proper airflow, and examining the sealed system for restrictions or leaks. D-sensor resistance and wiring integrity should also be confirmed to rule out a sensor fault generating a false reading.

Source: manufacturer service documentation.

Common causes of C1

  1. 01

    Low refrigerant charge

    Part replacement

    A refrigerant leak or undercharge prevents the evaporator from reaching the required temperature despite continuous compressor operation. Confirm using manifold gauges; low suction pressure is a strong indicator.

  2. 02

    Weak or failing compressor

    Part replacement

    A compressor that runs but produces insufficient compression will not cool the evaporator properly even after 3 hours. Check amp draw and listen for abnormal noise; low compression output confirms the fault.

  3. 03

    Evaporator or condenser fan failure

    Part replacement

    If either fan motor is not circulating air adequately, heat exchange efficiency drops and the evaporator stays warm. Inspect both fans for rotation, unusual noise, and correct voltage supply.

  4. 04

    Sealed system restriction or blockage

    Part replacement

    A partial restriction in the capillary tube or filter drier can mimic low refrigerant by starving the evaporator. Manifold gauge readings showing abnormally low suction and high head pressure together suggest this condition.

  5. 05

    Faulty D-sensor

    Wiring / connection

    If the defrost sensor is reading temperatures inaccurately, it can trigger a false C1 code even when the cooling system is performing correctly. Verify sensor resistance values match specifications and check wiring for damage or loose connections.

See the test procedure for each cause

Frequently asked questions about C1

What does C1 mean on a Daewoo refrigerator?
C1 indicates that the D-sensor temperature is still above -5°C after the compressor has run continuously for 3 hours, measured after the first defrost cycle. This tells the control board that the sealed refrigeration system is not cooling the evaporator to the expected level. The refrigerator continues to operate while displaying the code, but the underlying issue needs to be diagnosed and repaired. Common causes include low refrigerant, a failing compressor, restricted airflow, or a faulty D-sensor.
Can I fix a C1 error on my Daewoo refrigerator myself?
Some portions of the diagnosis are DIY-friendly, such as checking that evaporator and condenser fan motors are spinning freely and that airflow is not blocked by ice buildup or debris. However, if the cause is a refrigerant leak, low charge, or compressor failure, a certified technician is required because handling refrigerants requires EPA certification and specialized equipment. A faulty D-sensor is a more accessible repair if wiring and resistance checks confirm the sensor is the problem.
Is it safe to keep using my Daewoo refrigerator when C1 is showing?
The refrigerator does continue running in normal mode during a C1 alert, so it does not shut down immediately. However, if the cooling system is genuinely underperforming, internal temperatures may not stay low enough to keep food safe over time. It is best to monitor internal temperatures closely with a thermometer and arrange for service promptly rather than relying on the unit to maintain proper cooling indefinitely.
How much does it cost to repair a Daewoo refrigerator showing C1?
Repair costs vary significantly depending on the root cause. A D-sensor replacement is typically at the lower end, often in the range of $50 to $150 including parts and labor. Refrigerant recharge or sealed system repair can run from $150 to $400 or more depending on the extent of the leak and refrigerant type. Compressor replacement is the most expensive possibility, often ranging from $300 to $600 or higher depending on parts availability and labor rates in your area.
Will resetting my Daewoo refrigerator clear the C1 error code?
A power reset may temporarily clear the C1 display, but the code will return if the underlying problem is not resolved. The control board triggers C1 based on a specific condition: the D-sensor reading above -5°C after 3 hours of continuous compressor runtime following defrost. Until the cooling system performs correctly and meets that threshold, the code will continue to appear after each reset cycle. Resetting without repairing does not address the root cause.

Related Daewoo refrigerator codes

All Daewoo refrigerator codes
View all 30 Daewoo refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass