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Error code reference

Frigidaire Refrigerator Error Code R-Sensor Error

Sensor system in fresh food (FF) compartment has errors; temperature error code displays when sensing…

Frigidaire codesFrigidaire refrigerator codes

Sensor system in fresh food (FF) compartment has errors; temperature error code displays when sensing temperature is more than 149°F (+65°C) or less than -58°F (-50°C).

First step from the service manual

Check voltage of MAIN PCB CN30#6 <-> CN76#1: shall be 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 Error means on a Frigidaire refrigerator

The R-Sensor Error on a Frigidaire refrigerator indicates a fault within the temperature sensor system located in the fresh food (FF) compartment. This code triggers when the Main PCB receives a temperature reading from the fresh food sensor that falls outside the acceptable operating range, specifically above 149°F (65°C) or below -58°F (-50°C). Because those temperatures are physically impossible under normal refrigerator operation, readings in those ranges tell the control board that the sensor circuit itself is faulty rather than the actual compartment temperature.

The sensor system works by sending a variable voltage signal back to the Main PCB through connector CN30 pin 6 and CN76 pin 1. Under normal operating conditions, this voltage should read between 1.0V and 4.5V, corresponding to the valid temperature range the sensor is designed to measure. A reading outside that voltage window, whether due to an open circuit, a short to ground, or a failed sensor element, produces an out-of-range temperature value that triggers the R-Sensor Error code.

Common causes include a failed NTC thermistor in the fresh food compartment, damaged or corroded wiring between the sensor and the Main PCB, or a loose or oxidized connector at CN30 or CN76. In less frequent cases, the Main PCB itself may be misreading the signal due to a component failure on the board. Systematic diagnosis should begin with the voltage check at CN30 pin 6 to CN76 pin 1, which will help isolate whether the fault is in the sensor, the wiring harness, or the control board.

Source: manufacturer service documentation.

Common causes of R-Sensor Error

  1. 01

    Failed Fresh Food NTC Thermistor

    Part replacement

    The NTC temperature sensor in the fresh food compartment can fail open or short internally, causing the voltage signal at CN30 pin 6 to fall outside the 1.0V to 4.5V range. This is the most common hardware cause of this error and the sensor will need to be replaced.

  2. 02

    Damaged or Broken Wiring Harness

    Part replacement

    The wiring between the fresh food sensor and the Main PCB connectors CN30 and CN76 can develop breaks, kinks, or rodent damage that interrupt the voltage signal. Inspect the full length of the harness for visible damage, pinching, or burnt insulation.

  3. 03

    Loose or Corroded Connector Pins

    Wiring / connection

    Oxidation or a loose fit at connector CN30 pin 6 or CN76 pin 1 can increase resistance in the circuit enough to throw the voltage reading out of the valid 1.0V to 4.5V window. Disconnecting and reseating these connectors, and inspecting the pins for corrosion, is an important early diagnostic step.

  4. 04

    Moisture or Ice Buildup Around Sensor

    Wiring / connection

    Excessive ice accumulation or moisture intrusion near the fresh food sensor can alter its resistance characteristics and cause erratic or out-of-range readings. Check for signs of frost buildup around the sensor mounting location and verify the defrost system is functioning correctly.

  5. 05

    Faulty Main PCB

    Part replacement

    If voltage at CN30 pin 6 to CN76 pin 1 reads correctly within the 1.0V to 4.5V range but the error persists, the Main PCB may be misinterpreting the signal due to a failed component on the board. Board replacement is typically a last-resort diagnosis after the sensor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about R-Sensor Error

What does R-Sensor Error mean on a Frigidaire refrigerator?
The R-Sensor Error means the Main PCB has detected a temperature reading from the fresh food compartment sensor that is above 149°F (65°C) or below -58°F (-50°C), which are physically impossible values during normal operation. This tells the board the sensor circuit has failed rather than the compartment actually reaching those temperatures. The fault is most often a bad thermistor, damaged wiring, or a loose connector in the sensor circuit.
Can I fix the R-Sensor Error on my Frigidaire refrigerator myself?
A knowledgeable DIYer can perform basic checks such as inspecting and reseating connectors at CN30 and CN76 and examining the wiring harness for visible damage. Measuring the voltage at CN30 pin 6 to CN76 pin 1 with a multimeter, which should read between 1.0V and 4.5V, will help confirm whether the sensor or wiring is the problem. Replacing the fresh food temperature sensor is a manageable repair for someone comfortable with appliance work, but Main PCB replacement should be handled with care.
Is my food safe when a Frigidaire refrigerator shows an R-Sensor Error?
The error indicates a sensor circuit failure, not necessarily that the compartment has actually reached a dangerous temperature. However, because the refrigerator's control board relies on the sensor reading to manage cooling, improper temperature regulation is possible while the fault is active. Check the actual compartment temperature with a separate thermometer and move perishables to another refrigerator if the compartment is not staying at or below 40°F (4°C).
Will resetting my Frigidaire refrigerator clear the R-Sensor Error?
A power reset may temporarily clear the error display, but the code will return if the underlying sensor circuit fault has not been corrected. Resetting does not fix a failed thermistor, broken wire, or faulty connector. The voltage at CN30 pin 6 to CN76 pin 1 needs to be within the 1.0V to 4.5V range consistently before the error will stay cleared.
How much does it cost to repair a Frigidaire refrigerator R-Sensor Error?
Repair costs vary depending on what component is faulty. Replacing the fresh food temperature sensor is generally a lower-cost repair, with parts typically ranging from $15 to $50 and labor adding $75 to $150 if a technician is involved. If the Main PCB is the cause, costs increase significantly, with the board alone often ranging from $100 to $300 or more depending on the model.

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