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Error code reference

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

Refrigerator Defrost Heater Error

GE codesGE refrigerator codes

Refrigerator Defrost Heater Error – defrost heater housing separation, contact error, disconnection, short circuit, temperature fuse error, or defrost heating continuously for more than 80 minutes.

First step from the service manual

After separating MAIN PCB CN70 and CN71 from PCB, check resistance between CN70 white 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 R-1- (segment f) means on a GE refrigerator

The R-1- (segment f) error code on a GE refrigerator indicates a fault in the refrigerator compartment defrost heater circuit. This code triggers under several specific conditions: physical separation of the defrost heater housing, a contact error or disconnection in the wiring harness, a short circuit within the heater element, a blown temperature fuse (also called a thermal fuse or bimetal), or a situation where the defrost heater has been running continuously for more than 80 minutes without the expected temperature rise. The defrost system is responsible for periodically melting frost accumulation off the evaporator coil. When this circuit fails, frost buildup can block airflow and cause the refrigerator to lose cooling capacity.

Diagnosis begins at the main PCB connectors CN70 and CN71. After disconnecting both connectors from the PCB, a resistance check between the CN70 white wire and the CN71 orange wire should read approximately 102 ohms, with an acceptable tolerance of plus or minus 7%. A reading of 0 ohms indicates a short circuit in the heater element itself. An infinite resistance (open loop) reading points to a broken wire, a failed bimetal thermal cutout, or a blown temperature fuse in the defrost circuit. These resistance values give a clear starting point for isolating whether the fault is in the heater element, the thermal protection components, or the wiring between them.

Source: manufacturer service documentation.

Common causes of R-1- (segment f)

  1. 01

    Blown Defrost Temperature Fuse or Bimetal

    Part replacement

    The thermal fuse or bimetal cutout in the defrost heater circuit opens when exposed to excessive heat, breaking the circuit. This shows up as infinite resistance between CN70 white and CN71 orange and is one of the most frequent causes of this error.

  2. 02

    Defrost Heater Open Circuit or Burnout

    Part replacement

    The heater element itself can burn out or break internally, producing an open circuit reading of infinite ohms. Physical inspection of the heater element and a resistance measurement at the heater terminals will confirm this failure.

  3. 03

    Wiring Harness Disconnection or Break

    Wiring / connection

    A loose connector, corroded terminal, or broken wire between the PCB and the defrost heater assembly can interrupt the circuit. Check all wiring connections at CN70 and CN71 for proper seating and visible damage before replacing components.

  4. 04

    Shorted Defrost Heater Element

    Part replacement

    A short circuit in the heater element produces a 0-ohm reading between CN70 white and CN71 orange instead of the expected 102 ohms. This condition also risks tripping thermal protection devices and must be addressed by replacing the heater.

  5. 05

    Heater Running Continuously Beyond 80 Minutes

    Part replacement

    If the defrost cycle runs longer than 80 minutes without reaching the cutoff temperature, the control board logs this as a heater error. This can be caused by a failed defrost thermostat, poor thermal contact, or a control board issue that prevents normal defrost termination.

See the test procedure for each cause

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

What does R-1- (segment f) mean on a GE refrigerator?
The R-1- (segment f) code indicates a refrigerator defrost heater error. It can be triggered by a housing separation, wiring disconnection, short circuit, blown temperature fuse, or the defrost heater running continuously for more than 80 minutes. The error points to a fault somewhere in the defrost heater circuit, which is responsible for periodically melting frost off the evaporator coil.
How do I fix the R-1- (segment f) error on my GE refrigerator?
Start by disconnecting connectors CN70 and CN71 from the main PCB and measuring resistance between the CN70 white wire and the CN71 orange wire. A correct reading is 102 ohms plus or minus 7%. A reading of 0 ohms means the heater is shorted, and an infinite reading means there is an open circuit in the heater, bimetal, thermal fuse, or wiring. Repair or replace the failed component based on your measurement results.
Will resetting my GE refrigerator clear the R-1- (segment f) error?
A power reset may temporarily clear the error code from the display, but the underlying fault in the defrost heater circuit will remain. If the root cause is not repaired, the code will return the next time the control board attempts a defrost cycle. A proper repair requires identifying and replacing the failed component.
Is it safe to keep using my refrigerator while the R-1- (segment f) error is active?
It is not recommended to continue using the refrigerator without addressing this error. Without a functioning defrost heater, frost will accumulate on the evaporator coil and eventually block airflow entirely, causing the refrigerator to lose cooling ability. A shorted heater can also pose an electrical risk if left unrepaired.
How much does it cost to repair the R-1- (segment f) defrost heater error on a GE refrigerator?
Repair costs vary depending on which component has failed. A replacement defrost heater element typically costs between $20 and $60 for the part, while a thermal fuse or bimetal cutout is usually in the $5 to $25 range. Adding professional labor, total repair costs generally fall between $100 and $300 depending on your location and the extent of the fault.

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