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Error code reference

GE Refrigerator Error Code R-10- (segment g)

Water Tank Heater Error

GE codesGE refrigerator codes

Water Tank Heater Error – water tank heater housing separation, contact error, disconnection, short circuit.

First step from the service manual

After separating MAIN PCB CN78, check resistance between black to brown wire; should be 45 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-10- (segment g) means on a GE refrigerator

The R-10- (segment g) error code on a GE refrigerator indicates a Water Tank Heater Error. This code triggers when the control system detects a fault condition within the water tank heater circuit, which is responsible for preventing the water supply tank from freezing in certain refrigerator configurations. The four specific fault conditions covered by this code are: housing separation (the heater assembly physically separating from its mount), contact error (poor or intermittent electrical contact at a connector), disconnection (an open circuit in the wiring), and short circuit (a direct electrical fault within the heater element itself).

Diagnosis centers on the water tank heater's resistance value. With the main PCB connector CN78 disconnected, a technician measures resistance between the black and brown wires. A healthy heater element reads 45 ohms, plus or minus 7%, which works out to approximately 41.8 to 48.2 ohms. A reading of 0 ohms confirms a shorted heater element, meaning the heating coil has failed internally and is creating a direct circuit path. A reading of infinite resistance (OL on a multimeter) indicates an open circuit, pointing to a broken wire in the harness, a failed bimetal thermal cutout, or a physically disconnected connector.

The bimetal component in this circuit acts as a thermal safety device. If the heater overheats or the tank area reaches an unsafe temperature, the bimetal opens the circuit to cut power. A bimetal that has tripped permanently, or has failed in the open position, will produce an infinite resistance reading just like a broken wire. Identifying which specific fault is present requires careful resistance testing before any parts are replaced.

Source: manufacturer service documentation.

Common causes of R-10- (segment g)

  1. 01

    Failed Water Tank Heater Element (Short Circuit)

    Part replacement

    The heater element has shorted internally, causing a 0 ohm reading between the black and brown wires at CN78. A shorted heater must be replaced, as there is no repair for this condition.

  2. 02

    Open Circuit in Wiring Harness

    Part replacement

    A broken or damaged wire in the harness between the heater and CN78 produces an infinite resistance reading. Inspect the harness routing for pinch points, chafing, or visible breaks, particularly near any sharp cabinet edges or mounting clips.

  3. 03

    Loose or Corroded Connector at CN78

    Wiring / connection

    Poor contact at the CN78 connector on the main PCB can cause intermittent or complete loss of continuity. Unplug and reseat the connector, inspecting terminals for corrosion, bent pins, or moisture intrusion.

  4. 04

    Tripped or Failed Bimetal Thermal Cutout

    Part replacement

    The bimetal safety device in the heater circuit opens permanently if it experiences an overtemperature event or fails with age. This produces an infinite resistance reading identical to a broken wire, so the bimetal must be tested or replaced to isolate the fault.

  5. 05

    Heater Housing Separation

    Wiring / connection

    Physical separation of the heater assembly from its housing can pull wiring terminals apart or cause intermittent contact errors. Inspect the heater mounting for any signs of displacement, cracking, or looseness in the tank compartment area.

See the test procedure for each cause

Frequently asked questions about R-10- (segment g)

What does R-10- (segment g) mean on a GE refrigerator?
This code indicates a Water Tank Heater Error detected by the main control board. It covers four possible fault conditions: housing separation, contact error, disconnection, and short circuit within the water tank heater circuit. The heater involved is responsible for keeping the internal water tank from freezing. Proper diagnosis requires measuring resistance between the black and brown wires at CN78 on the main PCB.
How do I fix the R-10- (segment g) error on my GE refrigerator?
Start by disconnecting connector CN78 from the main PCB and measuring resistance between the black and brown wires with a multimeter. A reading of 45 ohms plus or minus 7% means the heater is good and the fault lies in the wiring or connector. A reading of 0 ohms points to a shorted heater element that needs replacement, and an infinite resistance reading points to a broken wire, failed bimetal, or open circuit in the harness. Repair the specific fault found before reconnecting the circuit.
Is the R-10- (segment g) error on a GE refrigerator a safety concern?
A shorted heater element is a legitimate electrical concern and should be addressed promptly, as a short circuit can cause component damage or tripped breakers. An open circuit or disconnection fault is less immediately dangerous but will leave the water tank without freeze protection, which can lead to a frozen and cracked tank in cold operating conditions. It is best to diagnose and correct the fault rather than continue running the refrigerator with this error active.
How much does it cost to repair the R-10- (segment g) error on a GE refrigerator?
Repair cost depends entirely on what component has failed. If the fix is simply reseating a loose connector or repairing a chafed wire, out-of-pocket costs may be minimal. Replacing the water tank heater element or bimetal thermal cutout typically involves parts costs in the range of $20 to $80, while a professional service call adds labor costs that generally range from $100 to $200 or more depending on your location.
Will resetting my GE refrigerator clear the R-10- (segment g) error code?
A power reset may temporarily clear the error display, but the code will return if the underlying fault in the water tank heater circuit is still present. Because this error is tied to a measured resistance value detected by the main PCB, the board will re-detect the fault the next time it checks the heater circuit. A permanent resolution requires identifying and correcting the actual electrical fault, whether that is a failed heater, open wiring, faulty bimetal, or bad connector.

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