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Error code reference

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

Freezer Defrost Heater Error

GE codesGE refrigerator codes

Freezer Defrost Heater Error – defrost heater housing separation, contact error, disconnection, short circuit, temperature fuse error, or defrost heating continuously for more than 70 minutes.

First step from the service manual

After separating MAIN PCB CN70 and CN71 from PCB, check resistance between CN70 brown to CN71 orange; should be 102 ohms ±7%. 0 ohm = heater short, ∞ ohm = wire/bimetal open.

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

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

The F-1- (segment g) error code on a GE refrigerator indicates a Freezer Defrost Heater Error. This code is triggered when the control system detects a fault within the defrost heater circuit, which can include physical separation of the heater housing, poor or lost electrical contact, a disconnected wire, a short circuit in the heater element, a failed temperature fuse (bimetal), or a condition where the defrost heater has been running continuously for more than 70 minutes without the cycle completing normally. The defrost system is responsible for melting frost accumulation off the evaporator coils, and any failure here can lead to ice buildup, reduced airflow, and loss of cooling performance.

The primary diagnostic procedure involves disconnecting connectors CN70 and CN71 from the Main PCB and measuring resistance between the brown wire on CN70 and the orange wire on CN71. The correct resistance reading should be 102 ohms, plus or minus 7 percent (approximately 94.9 to 109.1 ohms). A reading of 0 ohms indicates a short circuit in the heater element itself. An infinite resistance reading (open circuit) points to a broken wire, a failed bimetal thermal fuse, or a disconnected component in the heater circuit. These two extremes help narrow the fault location before further disassembly is performed.

Beyond the heater element and wiring, the bimetal thermal cutout is a common point of failure in this circuit. This safety device opens the circuit if the heater reaches an unsafe temperature, and once it trips or fails permanently, the circuit reads as open. A defrost cycle exceeding 70 minutes typically indicates the heater or defrost thermostat is not terminating the cycle correctly, which may point to a failed defrost thermostat, a stuck relay on the Main PCB, or a heater that is not generating adequate heat due to high resistance or partial failure.

Source: manufacturer service documentation.

Common causes of F-1- (segment g)

  1. 01

    Failed Defrost Heater Element

    Part replacement

    The heater element itself may have burned out or shorted internally. A resistance reading of 0 ohms between CN70 brown and CN71 orange confirms a short, while an open reading confirms a failed element.

  2. 02

    Open or Failed Bimetal Thermal Fuse

    Part replacement

    The bimetal thermal cutout is a one-time or resettable safety fuse in the heater circuit. If it has tripped permanently due to overheating, the circuit will read infinite resistance, and the fuse must be replaced.

  3. 03

    Disconnected or Broken Wiring

    Wiring / connection

    Loose connectors, broken wires, or poor contact at the CN70 or CN71 connectors can interrupt the heater circuit. Inspect all connections and wiring in the defrost circuit for damage or corrosion.

  4. 04

    Defrost Heater Housing Separation or Contact Error

    Wiring / connection

    Physical separation of the heater housing from its mounting or loss of contact at the heater terminals can cause an intermittent or permanent open circuit. Visually inspect the heater assembly for signs of damage or improper seating.

  5. 05

    Defrost Cycle Running Longer Than 70 Minutes

    Part replacement

    If the heater runs continuously beyond 70 minutes without the cycle terminating, the control board triggers this error. This can result from a faulty defrost thermostat that is not cutting off the heater, or a relay fault on the Main PCB holding the heater circuit closed.

See the test procedure for each cause

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

What does F-1- (segment g) mean on a GE refrigerator?
The F-1- (segment g) code indicates a Freezer Defrost Heater Error. It means the control board has detected a problem in the defrost heater circuit, which could be a short circuit, an open circuit caused by a broken wire or failed thermal fuse, a wiring disconnection, or a defrost cycle that ran for more than 70 minutes without completing. The error helps pinpoint faults in the defrost system that can lead to frost buildup and cooling loss.
Can I fix the F-1- (segment g) error myself on a GE refrigerator?
Some causes of this error, such as a loose connector at CN70 or CN71, can be addressed without replacing parts. However, a failed heater element, burned-out bimetal thermal fuse, or faulty defrost thermostat will require part replacement. The first diagnostic step is to disconnect CN70 and CN71 from the Main PCB and measure resistance between the brown and orange wires. A reading of 102 ohms (plus or minus 7 percent) confirms the heater circuit is intact, while 0 ohms or infinite resistance points to a specific failure that needs repair.
Is it safe to continue using my GE refrigerator when F-1- (segment g) is displayed?
Continued use is not recommended without addressing the fault. A failed defrost heater will allow frost to accumulate on the evaporator coils over time, which will eventually block airflow and cause the refrigerator and freezer compartments to warm up. In the case of a heater short circuit, continued operation could pose an electrical safety risk. It is best to diagnose and resolve the fault promptly.
Will resetting my GE refrigerator clear the F-1- (segment g) error code?
A power reset may temporarily clear the error code from the display, but it will not resolve the underlying fault in the defrost heater circuit. If the heater element is shorted, the bimetal fuse is open, or a wire is disconnected, those conditions will remain after a reset and the error will return during the next defrost cycle. A proper electrical diagnosis of the heater circuit is necessary to clear the code permanently.
How much does it cost to repair a GE refrigerator showing the F-1- (segment g) error?
Repair costs vary depending on which component has failed. A replacement defrost heater element typically ranges from $30 to $80 for parts, while a bimetal thermal fuse is usually $10 to $30. If the Main PCB is involved, the part cost can range from $100 to $300 or more. Adding professional labor, total repair costs generally fall between $100 and $450 depending on the specific fault and your location.

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