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Error code reference

Kenmore Refrigerator Error Code R1 R3 ON

Refrigerator sensor open or short circuit

Kenmore codesKenmore refrigerator codes

Refrigerator sensor open or short circuit

First step from the service manual

Check each sensor

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

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What R1 R3 ON means on a Kenmore refrigerator

The R1 R3 ON error code on a Kenmore refrigerator indicates that one or more refrigerator compartment temperature sensors have experienced an open circuit or short circuit condition. These sensors, typically negative temperature coefficient (NTC) thermistors, monitor the internal temperature of the refrigerator section and send resistance-based signals to the main control board. When the board detects a resistance value outside the expected range, either too high (open circuit) or too low (short circuit), it triggers this fault code and displays R1 R3 ON to alert the technician that sensor integrity has been compromised.

An open circuit condition occurs when the sensor circuit is broken, meaning no current can flow. This is commonly caused by a physically damaged sensor, a broken wire in the harness, or a corroded connector. A short circuit condition is the opposite problem, where two conductors that should be electrically isolated make unintended contact, causing resistance to drop abnormally low. Both conditions prevent the control board from receiving accurate temperature data, which can disrupt cooling cycles and temperature regulation in the refrigerator compartment.

Because the code references both R1 and R3, the diagnostic process requires checking each sensor individually. This involves inspecting the wiring harness for visible damage, checking connector pins for corrosion or looseness, and measuring sensor resistance with a multimeter at a known temperature to verify it falls within the expected range for the thermistor type installed. A failed sensor, damaged harness, or faulty control board connection are all potential root causes that must be systematically ruled out.

Source: manufacturer service documentation.

Common causes of R1 R3 ON

  1. 01

    Failed temperature sensor (thermistor)

    Part replacement

    The thermistor itself may have failed internally, resulting in an open or shorted condition. Testing with a multimeter will show resistance that is either infinite (open) or near zero (short) rather than the expected value for the ambient temperature.

  2. 02

    Damaged or broken wiring harness

    Part replacement

    The wire harness connecting the sensor to the control board can develop breaks or cuts due to ice buildup, pinching, or repeated stress over time. Inspect the harness visually and test continuity along each wire.

  3. 03

    Corroded or loose connector

    Wiring / connection

    Moisture inside the refrigerator compartment can cause the sensor connector pins to corrode, increasing resistance or breaking the circuit entirely. Disconnecting and inspecting the connector for green or white corrosion deposits is a key diagnostic step.

  4. 04

    Ice or frost accumulation around the sensor

    Wiring / connection

    Excessive frost buildup around a sensor can sometimes cause intermittent short circuit readings by bridging electrical contacts. Defrosting the compartment fully and retesting the sensor can help determine if this is the root cause.

  5. 05

    Faulty main control board

    Part replacement

    If the sensors and wiring test within normal parameters, the control board itself may be misreading the sensor signals due to a failed input circuit. This is the least common cause and should only be suspected after all sensors and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about R1 R3 ON

What does R1 R3 ON mean on a Kenmore refrigerator?
The R1 R3 ON code indicates that the refrigerator compartment temperature sensor circuit has an open or short circuit condition. The control board monitors sensor resistance to track internal temperatures, and this code appears when one or more sensors return a reading outside the acceptable range. It is a diagnostic alert that requires checking each sensor and its associated wiring individually.
How do I fix the R1 R3 ON error on my Kenmore refrigerator?
Start by inspecting the wiring harness and connectors for each refrigerator compartment sensor, looking for broken wires, loose pins, or corrosion. Use a multimeter to measure the resistance of each thermistor and compare it to the expected value at the current temperature. If a sensor reads open or shorted, replacing that sensor is typically the fix. If sensors and wiring test normal, the control board may need further evaluation.
Is it safe to keep using my refrigerator when the R1 R3 ON code is showing?
Continuing to run the refrigerator with this error is not recommended for extended periods, because the control board cannot accurately regulate the compartment temperature without reliable sensor input. Food safety may be at risk if temperatures rise or cycle incorrectly. Address the fault as soon as possible to ensure the unit is maintaining safe storage temperatures.
How much does it cost to repair a R1 R3 ON sensor error on a Kenmore refrigerator?
Repair costs vary depending on the root cause. A replacement thermistor sensor is generally an inexpensive part, with DIY costs typically in the range of $10 to $40 for the component. If professional labor is involved, total repair costs including diagnosis and parts can range from $100 to $250 or more. A control board replacement, if needed, will push costs higher.
Will resetting my Kenmore refrigerator clear the R1 R3 ON error code?
A power reset may temporarily clear the code, but if the underlying sensor or wiring fault still exists, the error will return once the control board runs its diagnostic checks again. A reset is useful for confirming whether the fault is intermittent or persistent, but it does not fix the physical problem. Proper diagnosis and repair of the sensor circuit are required to resolve the code permanently.

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