Daewoo Refrigerator Error Code C1

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.

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.

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.

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.

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.