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Error code reference

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

Freezer Defrost Sensor Error

GE codesGE refrigerator codes

Freezer Defrost Sensor Error – defrost sensor part error.

First step from the service manual

Check voltage of MAIN PCB CN30 #4 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.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What F-1- (segment c) means on a GE refrigerator

The F-1- (segment c) error code on a GE refrigerator indicates a Freezer Defrost Sensor Error, specifically a fault detected in the defrost sensor component itself. The defrost sensor monitors freezer compartment temperatures during and after defrost cycles, signaling the main control board when to terminate the defrost heater. When the control board detects an out-of-range or absent signal from this sensor, it logs the F-1- fault and may disable or alter defrost cycle operation to protect the freezer from overheating or ice buildup.

The primary diagnostic entry point for this code is measuring the voltage at the main PCB connector CN30 pin 4 relative to CN75 pin 1. Under normal operating conditions, this voltage should fall between 1.0V and 4.5V, varying with temperature as the sensor changes resistance. A reading outside this range, or no voltage at all, points to a wiring fault, connector problem, or a failed sensor. The defrost sensor is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as temperature rises, and the control board interprets that changing resistance as a voltage signal through a reference circuit.

Common failure points include an open or shorted thermistor element, corroded or loose connector pins at CN30 or CN75, and damaged wiring in the harness between the sensor and the main PCB. Physical damage from ice buildup around the sensor mounting location can also stress the wiring or crack the sensor housing. A failed main PCB that cannot correctly read or supply the reference voltage to the sensor circuit can also trigger this code, though board failure is less common than sensor or wiring issues.

Source: manufacturer service documentation.

Common causes of F-1- (segment c)

  1. 01

    Failed Defrost Sensor (Thermistor)

    Part replacement

    The NTC thermistor element inside the defrost sensor has opened or shorted, producing a voltage reading outside the 1.0V to 4.5V expected range at CN30 pin 4 to CN75 pin 1. Replacing the sensor is the most frequent fix for this code.

  2. 02

    Loose or Corroded Connector Pins

    Wiring / connection

    The connectors at CN30 or CN75 on the main PCB can develop corrosion or lose contact over time, interrupting the sensor signal circuit. Inspect and reseat both connectors, checking for bent, corroded, or pushed-back pins.

  3. 03

    Damaged Wiring Harness

    Part replacement

    The wiring between the defrost sensor and the main board can be pinched, chafed, or broken, especially where it routes through the freezer wall or near ice buildup areas. A continuity check along the harness will reveal any open or shorted conductors.

  4. 04

    Ice Damage to Sensor or Wiring

    Part replacement

    Excessive ice accumulation around the sensor mounting location can physically crack the sensor body or stress the wire connections. Inspect the sensor and surrounding area for ice intrusion and physical damage after thawing the freezer.

  5. 05

    Faulty Main PCB

    Part replacement

    If the board cannot supply or read the reference voltage correctly at CN30 pin 4 and the sensor and wiring check out, the main PCB may be the cause. This is the least common scenario and should be diagnosed after ruling out the sensor and wiring.

See the test procedure for each cause

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

What does F-1- (segment c) mean on a GE refrigerator?
The F-1- (segment c) code indicates a Freezer Defrost Sensor Error, meaning the main control board has detected a problem with the defrost sensor in the freezer compartment. The sensor signal voltage at PCB connectors CN30 and CN75 is outside the expected 1.0V to 4.5V range. This typically points to a faulty sensor, damaged wiring, or a connection issue rather than a major system failure.
Can I fix the F-1- (segment c) error code myself?
A knowledgeable DIYer can address this error by checking the wiring harness and connector pins at CN30 and CN75 for visible damage or corrosion, then testing the defrost sensor. If the sensor resistance or the circuit voltage is out of range, replacing the sensor is a straightforward repair. However, if the main PCB is suspected, professional diagnosis is recommended before purchasing a board.
Is it safe to keep using my refrigerator while the F-1- code is active?
In the short term, the refrigerator will likely continue cooling, but a non-functional defrost sensor can cause the defrost cycle to operate incorrectly. Over time this can lead to ice buildup on the evaporator coils, reduced airflow, and eventually warmer temperatures in the freezer and fresh food sections. It is best to address the error promptly to avoid secondary issues.
How much does it cost to repair the F-1- (segment c) error on a GE refrigerator?
If only the defrost sensor needs replacement, parts typically cost between $20 and $60 depending on the model, with professional labor adding $80 to $150 on top of that. If the main PCB is the root cause, board replacement can range from $150 to $350 or more for parts alone. Getting the sensor and wiring tested first can help avoid unnecessary board replacement costs.
Will resetting my GE refrigerator clear the F-1- error code?
A power reset may temporarily clear the displayed code, but if the underlying sensor or wiring fault still exists, the code will return once the control board runs its diagnostic checks again. Resetting is useful for confirming whether the fault is intermittent, but it does not repair the defective component. The root cause must be corrected for the error to stay cleared.

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