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Error code reference

Frigidaire Refrigerator Error Code R-SENSOR

Refrigerator Room Sensor Error

Frigidaire codesFrigidaire refrigerator codes

Refrigerator Room Sensor Error - open or short-circuit, connector failure, or temperature reading greater than 122°F or less than -58°F.

First step from the service manual

Check the voltage at MAIN PCB Sensor between 4.5V~1.0V.

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

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What R-SENSOR means on a Frigidaire refrigerator

The R-SENSOR error code on a Frigidaire refrigerator indicates a fault with the refrigerator compartment room (air) temperature sensor. This sensor is a thermistor that continuously reports compartment temperature to the main PCB. The control board expects to see a voltage signal at the sensor input pin that falls within a specific operating range of 4.5V down to 1.0V, corresponding to the sensor's resistance changing with temperature. When the board detects a voltage outside this range, it interprets the condition as an open circuit, a short circuit, or a temperature reading that has exceeded the valid bounds of greater than 122°F or less than -58°F.

The R-SENSOR fault can be triggered by several distinct hardware failures. A broken or corroded connector at the main PCB sensor harness plug is among the most frequent causes, as vibration and moisture can degrade the terminal contact over time. A failed thermistor that has drifted out of its normal resistance range will push the voltage signal outside the 4.5V to 1.0V window, triggering the fault. Wiring harness damage between the sensor and the main PCB, including pinched, chafed, or rodent-damaged wires, can create an intermittent or permanent open or short circuit condition.

Diagnosing this code begins at the main PCB sensor connector by measuring the DC voltage between the sensor signal pin and ground. A reading between 1.0V and 4.5V indicates the sensor circuit is functioning within normal parameters and points toward a control board issue. A reading at or near 0V suggests a short circuit or wiring fault, while a reading at or near 5V indicates an open circuit, typically caused by a failed thermistor or a broken wire in the harness.

Source: manufacturer service documentation.

Common causes of R-SENSOR

  1. 01

    Faulty refrigerator compartment thermistor

    Part replacement

    The thermistor itself has failed open or short, causing its resistance to fall outside the normal operating range. This drives the voltage at the main PCB sensor connector below 1.0V or above 4.5V, triggering the fault code.

  2. 02

    Loose or corroded sensor connector at the main PCB

    Wiring / connection

    The harness connector at the main PCB sensor input can loosen or corrode over time, interrupting the signal path. Inspect the connector for bent terminals, corrosion, or a plug that is not fully seated.

  3. 03

    Damaged wiring harness

    Part replacement

    Wires running from the thermistor to the main PCB can become pinched, chafed against cabinet edges, or broken, creating an open or short circuit. Check the full length of the harness for visible damage or bare conductors.

  4. 04

    Extreme compartment temperature condition

    Wiring / connection

    If the fresh food compartment has reached a temperature above 122°F or below -58°F due to a separate cooling system fault, the sensor itself may be working correctly but reporting an out-of-range value. Verify actual compartment temperature with a calibrated thermometer.

  5. 05

    Failed main PCB

    Part replacement

    If voltage at the sensor connector is within the 1.0V to 4.5V range and the thermistor and wiring test good, the main PCB may no longer be correctly reading or processing the sensor signal. Board replacement would be required.

See the test procedure for each cause

Frequently asked questions about R-SENSOR

What does R-SENSOR mean on a Frigidaire refrigerator?
R-SENSOR indicates a refrigerator compartment room sensor error. The main PCB has detected that the voltage signal from the fresh food compartment thermistor has fallen outside the expected range of 4.5V to 1.0V. This can be caused by an open circuit, a short circuit, a connector failure, or an actual compartment temperature above 122°F or below -58°F.
Can I fix the R-SENSOR error myself?
A knowledgeable DIYer can diagnose and often fix this error by checking the sensor connector at the main PCB for corrosion or loose fit, inspecting the wiring harness for damage, and measuring the voltage at the PCB sensor pin. If the thermistor itself has failed, replacing it is a straightforward repair that requires basic tools and a compatible replacement part. Main PCB replacement is more involved and may warrant a professional technician.
Is the R-SENSOR error dangerous?
The error itself is not a safety hazard, but it does mean your refrigerator's control board cannot reliably monitor compartment temperature. If the cooling system is also malfunctioning, food inside the refrigerator may not be kept at a safe temperature. Check the actual compartment temperature and move perishables if the unit is not cooling properly.
How much does it cost to repair a Frigidaire R-SENSOR error?
Repair cost depends on the root cause. A replacement thermistor is generally an affordable part, typically in the range of $15 to $50. If the main PCB needs replacement, parts alone can range from $100 to $300 or more depending on the model. Adding professional labor will increase the total, typically bringing a full repair to between $150 and $400.
Will resetting the refrigerator clear the R-SENSOR error code?
Unplugging the refrigerator for a few minutes and restarting it may temporarily clear the error, but the code will return if the underlying fault is still present. A reset is useful for confirming whether the fault is intermittent, such as a loose connector, versus a hard component failure. Resolving the code permanently requires identifying and correcting the root cause in the sensor circuit.

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