mypros+
Error code reference

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

Freezer Sensor Error

GE codesGE refrigerator codes

Freezer Sensor Error – sensor part error.

First step from the service manual

Check voltage of MAIN PCB CN30 #3 to CN75 #1; should be between 4.5V to 1.0V.

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

MyPros+ Max

Get the full diagnostic procedure for F-1- (segment b).

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F-1- (segment b) means on a GE refrigerator

The F-1- (segment b) error code on a GE refrigerator indicates a Freezer Sensor Error, specifically identified as a sensor part error. This code points to a fault in the freezer temperature sensor circuit, which is responsible for sending real-time temperature data to the main control board. The control board uses this input to regulate compressor cycles, defrost timing, and overall freezer temperature management. When the sensor signal falls outside acceptable parameters, the board logs this fault and displays the error.

The primary diagnostic step involves measuring the voltage between MAIN PCB connector CN30 pin 3 and connector CN75 pin 1. Under normal operating conditions, this voltage should read between 1.0V and 4.5V, varying with freezer temperature. A reading outside this range indicates either a failed sensor, a wiring fault in the sensor circuit, or a problem with the main PCB itself. Voltage at or near 0V typically suggests a short circuit or open wire, while a reading above 4.5V may point to an open sensor or a break in the circuit.

The freezer temperature sensor is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as temperature increases. If the thermistor element has degraded or failed, it will produce an inaccurate or absent voltage signal at the PCB connectors. Intermittent wiring faults, caused by damaged harness insulation or loose connector terminals at CN30 or CN75, can also trigger this code even when the sensor itself is functional.

Source: manufacturer service documentation.

Common causes of F-1- (segment b)

  1. 01

    Failed Freezer Temperature Sensor

    Part replacement

    The NTC thermistor sensor has degraded or failed outright, producing a voltage outside the 1.0V to 4.5V range at CN30 pin 3 to CN75 pin 1. This is the most frequent cause and is confirmed by an out-of-range voltage reading at the specified connector pins.

  2. 02

    Damaged or Disconnected Wiring Harness

    Wiring / connection

    The wiring between the freezer sensor and the main PCB connectors CN30 or CN75 may be broken, pinched, or have a loose terminal. Inspect the harness for visible damage and verify that both connectors are fully seated.

  3. 03

    Corroded or Loose Connector Terminals

    Wiring / connection

    Moisture or frost intrusion can corrode the pins at CN30 or CN75, increasing resistance and disrupting the voltage signal. Check the connector terminals for oxidation or looseness and clean or reseat as needed.

  4. 04

    Faulty Main PCB

    Part replacement

    If the sensor and wiring both test within specification but the voltage at CN30 pin 3 to CN75 pin 1 remains out of range, the main control board itself may have a failed reference voltage circuit. This is less common but possible after ruling out sensor and wiring faults.

See the test procedure for each cause

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

What does F-1- (segment b) mean on a GE refrigerator?
This code indicates a Freezer Sensor Error, specifically a sensor part error. The main control board is not receiving a valid voltage signal from the freezer temperature sensor. Technicians diagnose this by measuring voltage at MAIN PCB connectors CN30 pin 3 and CN75 pin 1, which should read between 1.0V and 4.5V under normal conditions. A reading outside that range points to a failed sensor, wiring fault, or a board issue.
Can I fix the F-1- (segment b) error code myself?
A knowledgeable DIYer can inspect the wiring harness and connector terminals at CN30 and CN75 for obvious damage or looseness, and reseat connectors as a first step. Replacing the freezer temperature sensor is also a manageable repair if you are comfortable working with refrigerator wiring. However, verifying the exact voltage at the PCB connector pins requires a multimeter and some familiarity with reading wiring diagrams, so professional service is recommended if you are unsure.
Is it safe to keep using my refrigerator while this error is displayed?
Operating the refrigerator with an active F-1- (segment b) error carries some risk because the control board may not accurately regulate freezer temperature without a functioning sensor. Food in the freezer could be exposed to temperatures that are too warm or too cold without reliable monitoring. It is best to address the fault promptly and check freezer contents with a separate thermometer in the meantime.
How much does it cost to repair the F-1- (segment b) error on a GE refrigerator?
If only the freezer temperature sensor needs replacement, repair costs typically range from around $75 to $200 depending on parts and labor rates in your area. If the main PCB is at fault, costs can range from $200 to $500 or more. Getting a diagnostic assessment from a qualified technician will help confirm which component is responsible before committing to parts.
Will resetting my GE refrigerator clear the F-1- (segment b) error code?
A reset may temporarily clear the error code from the display, but the code will return if the underlying fault with the freezer sensor or its wiring has not been corrected. Resetting without repairing the cause does not restore accurate temperature monitoring. The proper fix requires identifying and resolving the root cause, whether that is a failed sensor, a wiring fault, or a board issue.

Related GE refrigerator codes

All GE refrigerator codes
View all 540 GE refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass