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Error code reference

Kenmore Refrigerator Error Code rS

Refrigerator sensor 1 (upper part in refrigerator compartment) short or open circuit.

Kenmore codesKenmore refrigerator codes

Refrigerator sensor 1 (upper part in refrigerator compartment) short or open circuit.

First step from the service manual

Check for a loose connection in CON9 on Main PCB.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What rS means on a Kenmore refrigerator

The rS error code on a Kenmore refrigerator indicates a fault with Refrigerator Sensor 1, the temperature sensor located in the upper portion of the refrigerator compartment. This sensor is a thermistor, a resistive component whose resistance changes predictably with temperature. The control board monitors the resistance of this sensor continuously, and when it detects either a short circuit (resistance too low) or an open circuit (resistance too high or no continuity), it throws the rS code and may disable normal cooling operation to prevent temperature control errors.

The Main PCB communicates with this sensor through connector CON9. A fault condition can arise from the sensor itself failing internally, from damaged or pinched wiring in the harness leading to the sensor, or from a loose or corroded connection at CON9 on the board. Because connector seating issues are the most common and easiest-to-resolve cause, the first diagnostic step is always to inspect and reseat CON9 before condemning the sensor or the board.

If the connector checks out, the next step is to test the thermistor resistance directly with a multimeter. A functioning thermistor will show a specific resistance value at a known temperature. An open circuit will read as infinite resistance (OL), while a short will read near zero ohms. Damaged wiring between CON9 and the sensor, including chafing against refrigerator components or frost damage, can also produce either fault condition and should be inspected carefully along its full length.

Source: manufacturer service documentation.

Common causes of rS

  1. 01

    Loose connection at CON9 on Main PCB

    Wiring / connection

    The sensor wiring harness connects to the main control board via connector CON9, and this connection can work loose over time due to vibration or thermal cycling. Inspect and firmly reseat the connector to see if the code clears.

  2. 02

    Failed thermistor sensor

    Part replacement

    The Refrigerator Sensor 1 thermistor can fail internally, producing either an open or shorted reading. Test the sensor with a multimeter: an open circuit reads as infinite resistance and a short reads near zero ohms, both indicating a faulty sensor that needs replacement.

  3. 03

    Damaged wiring harness

    Part replacement

    The wire harness running from the sensor to CON9 can become chafed, pinched, or cracked, especially near mounting clips or areas prone to frost buildup. Inspect the full length of the harness for any visible damage, corrosion, or breaks in the insulation.

  4. 04

    Corroded or burned connector pins

    Part replacement

    The pins inside CON9 can develop corrosion or heat damage that increases resistance or interrupts the circuit entirely. Inspect the connector pins closely for discoloration, oxidation, or physical damage, and clean or replace the connector as needed.

  5. 05

    Faulty Main PCB

    Part replacement

    In rare cases, the main control board itself may be misreading the sensor circuit or have a damaged input at CON9. This should only be suspected after the sensor, wiring, and connector have all been tested and found to be in good condition.

See the test procedure for each cause

Frequently asked questions about rS

What does rS mean on a Kenmore refrigerator?
The rS code indicates that Refrigerator Sensor 1, the temperature sensor located in the upper part of the fresh food compartment, has been detected as either shorted or open by the main control board. This sensor is a thermistor that the board uses to monitor compartment temperature. When its resistance falls outside the expected range, the board triggers this code. The fault can be in the sensor itself, the wiring harness, or the connector at the control board.
Can I fix the rS error code myself?
Yes, some causes are DIY-friendly. Start by unplugging the refrigerator, locating the Main PCB, and firmly reseating the connector labeled CON9. If the code returns after powering back on, you can test the thermistor sensor with a multimeter for an open or shorted reading. Replacing the sensor is a relatively straightforward repair for someone comfortable working with appliance wiring.
Will resetting my Kenmore refrigerator clear the rS error code?
A reset by unplugging the refrigerator for a few minutes may temporarily clear the code, but it will return if the underlying fault is still present. If the cause was simply a loose connector at CON9, reseating it before restoring power may resolve the issue permanently. A persistent rS code after a reset means the sensor, wiring, or board needs further diagnosis and repair.
Is it safe to keep using my refrigerator when the rS code is displayed?
Operating the refrigerator with an active rS code is not recommended for extended periods. Without accurate temperature data from Sensor 1, the control board cannot properly regulate cooling in the upper compartment, which could lead to food spoilage. Check the actual temperature inside the fridge and avoid storing perishables until the fault is resolved.
How much does it cost to repair a Kenmore refrigerator rS error code?
If the fix is simply reseating connector CON9, there is no parts cost involved. Replacing the thermistor sensor typically costs between $15 and $50 for the part alone, depending on the model. If a technician is needed for diagnosis and repair, total service costs including labor can range from $100 to $250 or more depending on your location and what components need to be replaced.

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