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Error code reference

Kenmore Refrigerator Error Code R1 sensor

Abnormal Refrigerator Sensor (1)

Kenmore codesKenmore refrigerator codes

Abnormal Refrigerator Sensor (1) - cut or short circuit wire detected on primary refrigerator temperature sensor.

First step from the service manual

Check for a loose connection in CON7 on Main PCB.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What R1 sensor means on a Kenmore refrigerator

The R1 sensor error on a Kenmore refrigerator indicates an abnormal condition detected on the primary refrigerator compartment temperature sensor. The control board has identified either an open circuit (cut wire) or a short circuit condition in the sensor circuit. This sensor is a thermistor, a resistive temperature-sensing device whose resistance changes predictably with temperature. When the main PCB reads a resistance value that falls outside the expected range, either extremely high resistance suggesting a break in the circuit or near-zero resistance suggesting a short, it triggers the R1 fault code.

The primary connection point to inspect is the CON7 connector on the main PCB. Loose or corroded pins at this connector are a frequent cause of intermittent or persistent sensor faults, since a poor connection can mimic an open circuit condition. Before replacing any components, the connector should be unplugged, inspected for corrosion, bent pins, or moisture intrusion, and firmly reseated.

If the connector checks out, the wiring harness running from the main PCB to the sensor location inside the refrigerator compartment should be traced for damage, pinching, or breaks. The thermistor sensor itself can also fail internally, producing an out-of-range resistance reading. Diagnosing which component is at fault requires a multimeter to measure sensor resistance and verify continuity through the harness.

Source: manufacturer service documentation.

Common causes of R1 sensor

  1. 01

    Loose or faulty connection at CON7 on main PCB

    Wiring / connection

    A loose, corroded, or improperly seated connector at the CON7 port on the main PCB is the first thing to check, as it can produce an open-circuit reading identical to a broken sensor. Unplug and firmly reseat the connector, inspecting for bent pins or corrosion.

  2. 02

    Damaged wiring harness

    Part replacement

    The wire harness running from the PCB to the R1 sensor can become pinched, cut, or broken, especially near door hinges or harness routing clips. A visual inspection followed by a continuity test with a multimeter will confirm whether a break exists.

  3. 03

    Failed R1 thermistor sensor

    Part replacement

    The thermistor itself can fail internally, causing its resistance to read open or shorted at the PCB. If wiring and connections are intact, measure the sensor resistance with a multimeter and compare it to the expected range for the current compartment temperature.

  4. 04

    Corroded or moisture-damaged connector pins

    Wiring / connection

    Moisture inside the refrigerator compartment can reach the sensor connector and cause corrosion, leading to increased resistance or a short between pins. Inspect connector terminals closely for greenish or white oxidation residue.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor, wiring, and all connectors test within normal parameters, the main PCB itself may be misreading the sensor circuit due to component failure on the board. This is the least common cause and should only be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about R1 sensor

What does R1 sensor mean on a Kenmore refrigerator?
The R1 sensor error indicates that the main PCB has detected an abnormal reading from the primary refrigerator compartment temperature sensor. The fault points to either a cut wire creating an open circuit or a short circuit somewhere in the sensor circuit. The first step is to check the CON7 connector on the main PCB for a loose or poor connection. If the connector is secure, the wiring harness and the sensor itself should be tested next.
Can I fix the R1 sensor error myself?
Many cases of the R1 error are caused by a loose connector at CON7 on the main PCB, which a homeowner or DIYer can address by unplugging and reseating the connector after disconnecting power to the refrigerator. If the issue is a damaged wire or a failed thermistor, those repairs require basic electrical skills and a multimeter to diagnose properly. Replacing the sensor or harness is within reach for experienced DIYers, but PCB replacement is best handled by a qualified technician.
Is it safe to keep using my refrigerator while the R1 sensor error is active?
Operating the refrigerator with an active R1 sensor fault is not recommended for extended periods, because the control board cannot accurately monitor the compartment temperature. This can lead to improper cooling, which may allow food to reach unsafe temperatures. It is best to address the fault promptly and use a standalone thermometer to monitor conditions in the meantime if the refrigerator must remain in use.
How much does it cost to repair the R1 sensor error on a Kenmore refrigerator?
If only the connector needs reseating, there is no parts cost involved. A replacement thermistor sensor typically costs in the range of $15 to $50 depending on the specific model. If the wiring harness requires replacement, parts can range from $20 to $80. Main PCB replacement is the most expensive scenario, with parts generally ranging from $100 to $300 or more, plus labor if a technician is hired.
Will resetting the refrigerator clear the R1 sensor error?
Performing a reset by unplugging the refrigerator for several minutes may temporarily clear the error code, but it will return if the underlying problem with the sensor circuit has not been resolved. A reset is useful for confirming whether a fault is persistent or intermittent, but it is not a fix on its own. The wiring, connector at CON7, and sensor should all be inspected and tested to find and correct the root cause.

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