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Error code reference

Daewoo Freezer Error Code R1

R-Sensor disconnection or short circuit.

Daewoo codesDaewoo freezer codes

R-Sensor disconnection or short circuit.

First step from the service manual

Measure the voltage between terminal PIN 2 and 3 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 R1 means on a Daewoo freezer

The R1 error code on a Daewoo freezer indicates a fault with the R-Sensor, which is a temperature sensor used by the main control board to monitor refrigerant or compartment temperatures as part of the unit's thermal management system. The error is triggered when the main PCB detects that the sensor signal is outside the expected voltage range, pointing to either a short circuit or an open (disconnected) circuit condition in the sensor wiring or the sensor itself.

To begin diagnosis, measure the voltage between terminal PIN 2 and PIN 3 of connector CN5 on the Main PCB. A reading below 0.5V indicates a short circuit condition in the sensor circuit, meaning current is flowing through an unintended path, likely due to damaged wiring, a pinched harness, or a failed sensor with internal resistance collapse. A reading above 4.7V points to an open circuit, meaning the signal path is broken, which can result from a disconnected harness, corroded terminals, or a sensor whose internal resistance has gone to infinity due to physical damage or thermal stress.

The R-Sensor itself is a thermistor, meaning its resistance changes predictably with temperature. When functioning correctly, the sensor produces a voltage signal within a defined window that the main PCB interprets as a temperature reading. Any deviation caused by wiring faults or sensor failure pushes the voltage outside that window, triggering the R1 code and potentially disabling normal compressor or defrost operation until the fault is resolved.

Source: manufacturer service documentation.

Common causes of R1

  1. 01

    Faulty R-Sensor (thermistor failure)

    Part replacement

    The thermistor itself may have failed internally, causing its resistance to collapse (short) or go open. This is the most common cause and will show as an out-of-range voltage at CN5 PIN 2 and 3.

  2. 02

    Disconnected or loose sensor harness

    Wiring / connection

    The connector linking the R-Sensor to CN5 on the main PCB may have come loose or pulled out, breaking the signal path and causing an open circuit reading above 4.7V.

  3. 03

    Damaged sensor wiring

    Part replacement

    The wiring between the sensor and the PCB may be pinched, chafed, or cut, which can cause either a short circuit or an open circuit depending on how the wire is damaged.

  4. 04

    Corroded or oxidized connector terminals

    Wiring / connection

    Corrosion at the CN5 connector terminals or at the sensor connector can increase resistance in the circuit enough to push the voltage signal out of range, often reading high.

  5. 05

    Main PCB fault

    Part replacement

    If the wiring and sensor both test within normal parameters but the error persists, the main PCB itself may have a defect affecting the sensor input circuit at CN5.

See the test procedure for each cause

Frequently asked questions about R1

What does R1 mean on a Daewoo freezer?
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.
Can I fix the R1 error myself on a Daewoo freezer?
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.
Is it safe to keep using my Daewoo freezer with an R1 error?
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.
Will resetting my Daewoo freezer clear the R1 error code?
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.
How much does it cost to repair an R1 error on a Daewoo freezer?
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.

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