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Error code reference

Frigidaire Refrigerator Error Code r1

Refrigerator sensor disconnection or short circuit.

Frigidaire codesFrigidaire refrigerator codes

Refrigerator sensor disconnection or short circuit.

First step from the service manual

Measure the resistance between both terminals after separating CN8 (Basic) or CN14 (Dispenser) of the Main PCB; if disconnected or short, replace the refrigerator sensor.

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

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What r1 means on a Frigidaire refrigerator

The r1 error code on a Frigidaire refrigerator indicates that the main control board has detected either a disconnection or a short circuit in the refrigerator compartment temperature sensor circuit. This sensor, typically a thermistor, monitors the internal temperature of the refrigerator section and sends resistance-based signals to the main PCB. When the board cannot read a valid signal from this sensor, it triggers the r1 fault to alert the technician that the temperature monitoring circuit has failed.

The diagnostic procedure centers on the sensor's connector at the main PCB. Depending on the model, this will be connector CN8 on Basic models or CN14 on Dispenser models. After disconnecting the connector, a technician should measure the resistance across both terminals of the sensor. A functional thermistor will read within a specific resistance range corresponding to the ambient temperature. A reading of infinite resistance (open circuit) indicates a wire break or full disconnection, while a reading near zero ohms indicates a short circuit within the sensor or its wiring harness.

Common root causes include physical damage to the sensor wiring, corrosion at the connector terminals, a failed thermistor element, or a connector that has worked loose from vibration over time. In some cases, moisture intrusion into the connector can cause intermittent shorts that produce the r1 code sporadically. If the resistance measurement confirms either an open or shorted condition, the refrigerator sensor assembly should be replaced to restore proper temperature monitoring and control.

Source: manufacturer service documentation.

Common causes of r1

  1. 01

    Failed refrigerator thermistor

    Part replacement

    The thermistor element itself can fail internally, resulting in either an open circuit or a short. This is confirmed by measuring resistance across the sensor terminals after unplugging the CN8 or CN14 connector from the main PCB.

  2. 02

    Loose or disconnected connector

    Wiring / connection

    The sensor connector at CN8 (Basic) or CN14 (Dispenser) on the main PCB can work loose over time due to vibration. Inspecting and reseating the connector is the first physical check before measuring resistance.

  3. 03

    Damaged sensor wiring harness

    Part replacement

    The wiring between the sensor and the main PCB can be pinched, cut, or broken, resulting in an open circuit reading. Visually trace the harness for any signs of chafing or physical damage.

  4. 04

    Corroded or contaminated connector terminals

    Wiring / connection

    Moisture or oxidation at the CN8 or CN14 connector pins can cause high resistance or intermittent short circuit conditions that trigger the r1 code. Inspect the terminals for discoloration, rust, or moisture residue.

  5. 05

    Faulty main PCB sensor input circuit

    Part replacement

    In less common cases, the sensor input circuit on the main PCB itself can fail, producing a false r1 code even when the sensor and wiring test within normal resistance ranges. This is typically diagnosed after confirming the sensor and harness are good.

See the test procedure for each cause

Frequently asked questions about r1

What does r1 mean on a Frigidaire refrigerator?
The r1 code indicates that the main control board has detected a disconnection or short circuit in the refrigerator compartment temperature sensor circuit. The board cannot receive a valid temperature reading from the sensor, which is required for proper cooling regulation. A technician diagnoses this by measuring the resistance at the sensor connector on the main PCB and replacing the sensor if an open or short is confirmed.
Can I fix the r1 error code myself?
A knowledgeable DIYer can start by checking that the sensor connector at the main PCB is fully seated and free of visible corrosion or damage. If the connector appears secure, diagnosing the fault further requires a multimeter to measure sensor resistance, which involves accessing the main PCB. Replacing the sensor is a moderately involved repair, as the thermistor is typically located inside the refrigerator compartment and connected through the cabinet to the control board.
Is it safe to keep using my refrigerator when the r1 code is showing?
Operating the refrigerator with an active r1 code is not recommended for extended periods. Without a functioning temperature sensor, the control board cannot accurately regulate cooling, which means the compartment may run too warm or too cold. Food safety can be compromised if temperatures are not maintained correctly.
How much does it cost to fix the r1 error code on a Frigidaire refrigerator?
If only the refrigerator thermistor sensor needs replacement, parts typically range from around $20 to $60 depending on the model. Professional labor to diagnose and replace the sensor can add $80 to $200 or more. If the main PCB is at fault instead, the control board itself is significantly more expensive, often ranging from $150 to $350 or higher for the part alone.
Will resetting the refrigerator clear the r1 error code?
A power reset may temporarily clear the r1 code from the display, but the fault will return if the underlying sensor disconnection or short circuit is still present. The code indicates a hardware fault in the sensor circuit, not a software glitch, so a reset alone does not resolve the problem. The sensor resistance must be tested and the defective component replaced before the code will clear permanently.

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