Daewoo Freezer Error Code R1

The R1 code means the main control board has detected a problem with the R-Sensor, a thermistor used to monitor temperature in the freezer system. The board is seeing a voltage at connector CN5 PIN 2 and 3 that is either too low, indicating a short circuit, or too high, indicating an open or disconnected circuit. The error will not clear until the underlying sensor or wiring fault is repaired.

Continuing to run the freezer with an active R1 error is not recommended. Without a functioning R-Sensor, the control board cannot accurately monitor temperatures, which may cause the unit to run improperly and put stored food at risk. Address the fault as soon as possible to avoid potential food spoilage or further damage to the appliance.

Repair costs depend on the root cause. A replacement thermistor sensor is typically an inexpensive part, and the repair may cost between $50 and $150 if done professionally including labor. If the main PCB needs replacement, costs can range from $150 to $350 or more depending on parts availability and labor rates in your area. Cleaning corroded terminals or reseating a connector has little to no parts cost.

Some causes of the R1 error are DIY-friendly, such as reseating a loose connector at CN5 or cleaning corroded terminals. However, replacing the R-Sensor or repairing damaged wiring requires basic electrical knowledge and a multimeter to measure voltage at the PCB connector. If the main PCB itself is at fault, replacement is more complex and may be better handled by a qualified technician.

A power reset may temporarily clear the error display, but the R1 code will return if the underlying sensor or wiring fault has not been corrected. The main PCB continuously monitors the voltage signal from the R-Sensor, and any reading below 0.5V or above 4.7V at CN5 will retrigger the fault. A permanent fix requires diagnosing and repairing the sensor circuit.