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Error code reference

Kenmore Refrigerator Error Code r dS

Refrigerator defrost sensor error

Kenmore codesKenmore refrigerator codes

Refrigerator defrost sensor error — the refrigerator defrost sensor has a short, open, or abnormal resistance reading.

First step from the service manual

Check for a loose connection between Main PCB (CON7 pins 13 & 14), defrost controller, and sensor; check sensor resistance.

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
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What r dS means on a Kenmore refrigerator

The r dS error code on a Kenmore refrigerator indicates a fault in the refrigerator compartment defrost sensor circuit. This sensor monitors the temperature of the evaporator coil during the defrost cycle, signaling the control board when the coil has reached the appropriate temperature to terminate defrost. When the main PCB detects a short circuit, open circuit, or resistance reading outside the expected range on pins 13 and 14 of connector CON7, it logs this error and may disable or disrupt the automatic defrost cycle entirely.

The defrost sensor is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as temperature increases. A properly functioning sensor will produce a predictable resistance value at a given temperature. An open circuit (infinite resistance) or a short (near-zero resistance) are both clearly abnormal conditions the board can detect. Readings that fall outside the normal operating range, even without a complete open or short, can also trigger this code, pointing to a degraded or failing sensor element.

The most important first diagnostic step is to inspect the wiring harness between the main PCB (specifically CON7, pins 13 and 14), the defrost controller, and the sensor itself. Loose connections, corroded terminals, or damaged wiring can mimic a failed sensor. If connections are secure, the sensor's resistance should be measured directly and compared against the expected values for the compartment temperature at the time of testing. If resistance is out of spec, the sensor itself requires replacement.

Source: manufacturer service documentation.

Common causes of r dS

  1. 01

    Loose or corroded wiring connection

    Wiring / connection

    A poor connection at CON7 pins 13 or 14 on the main PCB, at the defrost controller, or at the sensor connector can interrupt the signal and trigger this code. Inspect all connectors in the circuit for corrosion, bent pins, or loose fit.

  2. 02

    Failed defrost sensor (open circuit)

    Part replacement

    The thermistor inside the sensor can fail in an open-circuit condition, producing infinite resistance. This is one of the most common hardware failures that triggers r dS and requires sensor replacement.

  3. 03

    Failed defrost sensor (short circuit)

    Part replacement

    The sensor can also fail by shorting internally, producing near-zero resistance regardless of temperature. This abnormal reading is detected by the main PCB and will trigger the r dS fault code.

  4. 04

    Damaged wiring harness

    Wiring / connection

    Chafed, pinched, or broken wires between the main PCB and the sensor can cause intermittent open or short conditions. Visually inspect the harness along its entire routing path for signs of physical damage.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor and all wiring check out correctly but the error persists, the main PCB itself may have a defective input circuit on CON7. This is the least likely cause and should only be considered after all other components have been verified.

See the test procedure for each cause

Frequently asked questions about r dS

What does r dS mean on a Kenmore refrigerator?
The r dS code indicates a refrigerator defrost sensor error. The main control board has detected a short, open circuit, or abnormal resistance reading from the defrost sensor in the refrigerator compartment. This sensor is responsible for monitoring evaporator coil temperature during the defrost cycle, and a fault in this circuit can disrupt automatic defrosting. Diagnosing the code starts with checking wiring connections at CON7 pins 13 and 14 on the main PCB and then testing the sensor's resistance directly.
Can I fix the r dS error myself on a Kenmore refrigerator?
Yes, in many cases a knowledgeable DIYer can resolve this error. Start by unplugging the refrigerator and checking all wiring connectors between the main PCB, defrost controller, and defrost sensor for looseness or corrosion. If connections are secure, use a multimeter to measure the sensor's resistance and determine whether it has failed open or short. Replacing a defrost sensor is a relatively straightforward repair, though accessing it typically requires removing the refrigerator's rear interior panel.
Is it safe to keep using my Kenmore refrigerator when r dS is displayed?
Short-term use is generally not an immediate safety hazard, but continuing to run the refrigerator with a defrost sensor fault can lead to progressive ice buildup on the evaporator coils. Over time, this restricts airflow and forces the compressor to work harder, potentially reducing cooling performance and damaging other components. It is best to diagnose and repair the fault as soon as possible to avoid secondary damage.
How much does it cost to repair the r dS error on a Kenmore refrigerator?
If the issue is a loose connector or damaged wire, the repair can be done at little to no parts cost. A replacement defrost sensor typically costs in the range of $15 to $50 for the part alone. If professional repair service is needed, expect to pay an additional $100 to $200 or more in labor, depending on your location and service provider. If the main PCB is at fault, board replacement costs can range from $100 to $300 or higher for the part.
Will resetting my Kenmore refrigerator clear the r dS error code?
A power reset by unplugging the unit for a few minutes may temporarily clear the code, but it will return if the underlying fault in the defrost sensor circuit has not been corrected. The main PCB will re-detect the abnormal resistance condition on its next check and reactivate the error. A reset is useful for confirming whether the fault is intermittent, such as a loose connection, but it is not a substitute for properly diagnosing and repairing the sensor or wiring.

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