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Error code reference

GE Refrigerator Error Code R-1- (segment b)

Refrigerator Sensor Error

GE codesGE refrigerator codes

Refrigerator Sensor Error – sensor part error.

First step from the service manual

Check voltage of MAIN PCB CN30 #6 to CN75 #1; should be between 4.5 to 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-1- (segment b) means on a GE refrigerator

The R-1- (segment b) error code on a GE refrigerator indicates a Refrigerator Sensor Error, specifically a sensor part fault. This code points to a problem with the refrigerator compartment temperature sensor circuit. The control board monitors the sensor's output voltage continuously, and when the reading falls outside the expected operating range, the board flags this error to alert the technician that the sensor or its circuit is not functioning correctly.

The primary diagnostic step involves measuring the voltage at MAIN PCB connector CN30 pin 6 through to connector CN75 pin 1. Under normal operating conditions, this voltage should read between 1.0V and 4.5V, reflecting the sensor's resistance response to temperature changes. A reading outside this window, whether shorted low or open high, indicates a fault in the sensor, its wiring harness, or the connector terminals at either end of the circuit.

Common causes include a failed NTC temperature sensor that has drifted out of specification, a broken or corroded wire in the harness between CN30 and CN75, or poor connector contact at either PCB connector. In some cases, the MAIN PCB itself may be unable to supply or read the reference voltage correctly, though this is less frequent than a sensor or wiring fault. Systematic voltage testing at the specified connectors allows the technician to isolate whether the fault lies in the sensor, the harness, or the board.

Source: manufacturer service documentation.

Common causes of R-1- (segment b)

  1. 01

    Failed refrigerator compartment temperature sensor

    Part replacement

    The NTC temperature sensor has failed open or shorted, causing its output voltage at CN30 pin 6 to CN75 pin 1 to fall outside the 1.0V to 4.5V range. Measuring resistance across the sensor terminals will confirm if it has drifted beyond its rated specification.

  2. 02

    Damaged or broken wiring harness

    Part replacement

    The wire harness connecting the sensor to the MAIN PCB can crack, fray, or break, especially near harness routing clips or door hinges. Visually inspect the harness and perform a continuity check between CN30 pin 6 and CN75 pin 1 to locate any open circuit.

  3. 03

    Loose or corroded connector terminals

    Wiring / connection

    Poor contact at connector CN30 or CN75 can cause intermittent or out-of-range voltage readings. Disconnect and inspect both connectors for bent pins, corrosion, or moisture intrusion, and reseat them firmly before retesting voltage.

  4. 04

    Short circuit in the sensor circuit

    Part replacement

    A pinched harness or moisture in the circuit can cause the voltage at the specified test points to drop below 1.0V, mimicking an extreme low-temperature reading. Inspect the harness routing for any areas where it contacts a sharp edge or refrigerant line.

  5. 05

    Faulty MAIN PCB

    Part replacement

    If the sensor and harness both test within specification but the voltage at CN30 pin 6 to CN75 pin 1 is still out of the 1.0V to 4.5V range, the MAIN PCB may be failing to supply or read the reference voltage correctly. Board replacement should only be considered after ruling out the sensor and wiring.

See the test procedure for each cause

Frequently asked questions about R-1- (segment b)

What does R-1- (segment b) mean on a GE refrigerator?
The R-1- (segment b) code indicates a Refrigerator Sensor Error, meaning the control board has detected that the refrigerator compartment temperature sensor is producing a voltage signal outside the expected range of 1.0V to 4.5V. This tells the technician that the sensor circuit, including the sensor itself, its wiring harness, or the connector terminals, needs to be inspected. The refrigerator may not maintain correct temperatures while this fault is active.
Can I fix the R-1- (segment b) error code myself?
A knowledgeable DIYer can perform basic checks such as reseating connectors CN30 and CN75 and inspecting the wiring harness for visible damage. However, accurately diagnosing this code requires a multimeter to measure voltage at the specified PCB connectors and potentially resistance testing of the sensor. If the sensor or wiring needs replacement, comfort with appliance disassembly is necessary, and some homeowners prefer to call a technician for this work.
Is it safe to keep using my GE refrigerator while the R-1- error is displayed?
Continuing to run the refrigerator with an active sensor fault is not recommended for extended periods. Without an accurate temperature reading from the refrigerator compartment sensor, the control board may not cycle the compressor or fans correctly, which can lead to food spoilage from inadequate cooling. Check the actual compartment temperature with a separate thermometer and transfer perishables if the unit is not holding a safe temperature.
Will resetting my GE refrigerator clear the R-1- error code?
A power reset by unplugging the refrigerator for a few minutes may temporarily clear the error display, but the code will return if the underlying fault in the sensor circuit has not been corrected. Because the control board detects the fault by continuously monitoring the voltage at CN30 and CN75, any out-of-range reading will trigger the code again once power is restored. A permanent fix requires repairing or replacing the faulty component.
How much does it cost to repair a GE refrigerator with the R-1- sensor error?
Repair costs vary depending on which component has failed. A replacement refrigerator compartment temperature sensor typically costs between $15 and $50 for the part alone. If the MAIN PCB requires replacement, parts can range from $80 to $250 or more. Adding professional labor, total repair costs generally fall in the range of $100 to $400 depending on the diagnosis and the rates in your area.

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