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Error code reference

Daewoo Refrigerator Error Code R1

R1-sensor (refrigerator sensor 1) malfunction due to short circuit or wire disconnection.

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R1-sensor (refrigerator sensor 1) malfunction due to short circuit or wire disconnection.

First step from the service manual

Check R1-sensor for short circuit or wire disconnection. System will operate using R2-sensor as backup.

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
  • Verified part numbers when replacement is required
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What R1 means on a Daewoo refrigerator

The R1 error code on a Daewoo refrigerator indicates a malfunction in the R1 sensor, which is the primary temperature sensor located in the refrigerator compartment. This sensor continuously monitors the internal temperature and sends data to the main control board to regulate compressor and fan operation. When the control board detects an abnormal signal from R1, either due to a short circuit in the sensor circuit or a broken wire connection, it triggers the R1 error code to alert the user and technician.

A short circuit in the sensor circuit typically causes the resistance reading to drop to near zero ohms, while a disconnected or broken wire causes the resistance to read as an open circuit, effectively infinite resistance. Neither reading falls within the sensor's normal operating range, so the control board flags the fault. The system is designed with a failsafe: when R1 is unavailable, the refrigerator will continue operating by relying on the R2 sensor as a backup, which helps preserve food until repairs can be made.

Diagnosis should begin with a visual inspection of the R1 sensor wiring harness for obvious breaks, corrosion, or loose connectors. If the wiring appears intact, the sensor itself should be tested for proper resistance values using a multimeter. Ice or frost buildup around the sensor can sometimes cause intermittent contact issues, so inspecting the sensor's mounting location for ice accumulation is also recommended.

Source: manufacturer service documentation.

Common causes of R1

  1. 01

    Broken or disconnected sensor wire

    Part replacement

    Physical damage, repeated door vibration, or stress on the wiring harness can cause a wire to break or pull loose from its connector. Inspect the wiring running to the R1 sensor for visible breaks, fraying, or disconnected plugs.

  2. 02

    Failed R1 temperature sensor

    Part replacement

    The sensor itself can fail internally, producing either a short circuit or an open circuit reading when tested with a multimeter. A sensor reading at the extremes of resistance, near zero or infinite, confirms sensor failure.

  3. 03

    Corroded or loose connector

    Wiring / connection

    Moisture inside the refrigerator compartment can cause corrosion at the sensor's wiring connector, increasing resistance or breaking continuity entirely. Check the connector terminals for oxidation or greenish buildup.

  4. 04

    Ice or frost bridging the sensor

    Wiring / connection

    Excessive frost accumulation around the sensor body can interfere with its readings or physically stress its wiring. A manual defrost cycle should be performed before testing to rule this out.

  5. 05

    Damaged wiring harness from rodent activity or physical impact

    Part replacement

    In some cases, external damage to the wiring harness from rodents or sharp objects inside the compartment can sever sensor wires. Look for chew marks, cuts, or pinched sections along the full wire run.

See the test procedure for each cause

Frequently asked questions about R1

What does R1 mean on a Daewoo refrigerator?
The R1 error code means the primary refrigerator compartment temperature sensor has a malfunction, caused by either a short circuit or a wire disconnection. The control board cannot get a valid temperature reading from this sensor. Fortunately, the refrigerator will continue operating using the R2 backup sensor, but the R1 sensor or its wiring will need to be repaired or replaced.
Can I fix the R1 error on my Daewoo refrigerator myself?
If the cause is a loose connector, a knowledgeable DIYer can inspect the wiring harness and reseat the connection to resolve the error. However, if the sensor itself has failed or a wire is broken inside the harness, replacing the component typically requires sourcing the correct part and some comfort with appliance wiring. When in doubt, a qualified appliance technician should handle the repair.
Is it safe to keep using my Daewoo refrigerator when the R1 code is showing?
Yes, the refrigerator is designed to continue operating on the R2 backup sensor when R1 fails, so your food should remain at safe temperatures in the short term. However, running on a backup sensor is not a permanent solution, as the system's temperature regulation may be less precise. The R1 sensor should be repaired as soon as practical to restore full functionality.
How much does it cost to fix a Daewoo refrigerator R1 sensor error?
If the fix involves simply reseating a loose connector, there may be no parts cost at all, only a service call fee if a technician is involved. Replacing the R1 temperature sensor itself typically costs somewhere in the range of $50 to $150 for parts and labor combined, depending on your location and the technician's rates. A wiring harness repair or replacement can push costs higher.
Will resetting my Daewoo refrigerator clear the R1 error code?
A power reset may temporarily clear the error code display, but the code will return if the underlying fault with the R1 sensor or its wiring has not been corrected. Resetting is useful for confirming whether the fault is intermittent, but it is not a repair. The sensor circuit must be inspected and the short circuit or disconnection resolved before the error will stay cleared.

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