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Error code reference

Samsung Range Error Code IGBT Sensor Open

IGBT sensor (Assy-Inverter Module) open error

Samsung codesSamsung range codes

IGBT sensor (Assy-Inverter Module) open error - A/D value rises over 239, or ambient temperature below -10°C. Defective sensor, misplaced wires, or defective PCB.

First step from the service manual

Check if sub wire is connected from Assy-Inverter Module to Assy Touch PCB. Check sub wire sequence matches PCB schematic. Measure sensor resistance (good condition: 10K ohms at 25°C).

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

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What IGBT Sensor Open means on a Samsung range

The IGBT Sensor Open error on a Samsung range indicates a fault in the Insulated Gate Bipolar Transistor (IGBT) temperature sensor circuit, which is housed within the Assy-Inverter Module. The IGBT is a power switching component used in induction cooking systems to regulate high-frequency current to the induction coils. A dedicated NTC thermistor monitors the IGBT's operating temperature to prevent thermal runaway. When the analog-to-digital (A/D) conversion value from this sensor rises above 239, or when the ambient temperature drops below -10 degrees Celsius, the control system interprets the reading as an open circuit condition and throws this error.

An open circuit in the sensor path means the PCB is receiving a signal outside the expected range, either because the sensor itself has failed, the wiring between the Assy-Inverter Module and the Assy Touch PCB is disconnected or routed incorrectly, or the Touch PCB has a defect preventing proper signal interpretation. A properly functioning IGBT sensor should measure approximately 10K ohms at 25 degrees Celsius. Readings significantly higher than this value at room temperature confirm an open or failing thermistor.

Diagnosing this fault begins with inspecting the sub wire harness that connects the Assy-Inverter Module to the Assy Touch PCB. Technicians should verify that the connector is fully seated and that the wire sequence matches the PCB schematic, as a misrouted harness can produce erroneous A/D readings identical to those caused by a failed sensor. If wiring checks out, resistance measurement of the IGBT sensor directly at the inverter module will confirm whether the thermistor requires replacement.

Source: manufacturer service documentation.

Common causes of IGBT Sensor Open

  1. 01

    Disconnected or improperly seated sub wire harness

    Wiring / connection

    The sub wire connecting the Assy-Inverter Module to the Assy Touch PCB may have come loose or was never fully seated. This is the first item to inspect, as a disconnected harness produces the same open-circuit A/D reading as a failed sensor.

  2. 02

    Incorrect sub wire sequence

    Wiring / connection

    If the sub wire harness was previously serviced or disturbed, individual wires may have been routed in the wrong order relative to the PCB schematic. An incorrect wire sequence causes the control board to misread sensor data and trigger this error.

  3. 03

    Defective IGBT sensor (Assy-Inverter Module thermistor)

    Part replacement

    The NTC thermistor inside the Assy-Inverter Module can fail open, producing resistance readings well above the expected 10K ohms at 25 degrees Celsius. Measuring resistance directly at the sensor terminals will confirm this failure.

  4. 04

    Defective Assy Touch PCB

    Part replacement

    If the wiring and sensor both measure correctly, the Touch PCB itself may have a faulty input circuit that cannot properly interpret the sensor signal. This is the least common cause but should be evaluated after ruling out wiring and sensor issues.

  5. 05

    Ambient temperature below -10 degrees Celsius

    Wiring / connection

    Extremely cold operating or storage environments can push the sensor reading outside the valid range even when all components are functioning correctly. This condition resolves once the unit is brought to a normal operating temperature above -10 degrees Celsius.

See the test procedure for each cause

Frequently asked questions about IGBT Sensor Open

What does IGBT Sensor Open mean on a Samsung range?
This error indicates that the IGBT temperature sensor circuit within the Assy-Inverter Module is reading outside its valid range, specifically an A/D value above 239 or an ambient temperature below -10 degrees Celsius. The IGBT sensor monitors the power switching component used by the induction cooking system, and an open-circuit reading triggers the fault to protect the electronics. The root cause is typically a loose wire harness connection, a miswired harness, a failed sensor thermistor, or a defective control board.
Can I fix the IGBT Sensor Open error myself on a Samsung range?
A knowledgeable DIYer can perform the initial wiring checks without special tools. Inspect whether the sub wire harness between the Assy-Inverter Module and the Assy Touch PCB is fully connected and that the wire sequence matches the schematic. If wiring appears correct, measuring the sensor resistance with a multimeter (expecting approximately 10K ohms at 25 degrees Celsius) can confirm or rule out a failed thermistor. Replacing internal PCB components or the inverter module itself is more involved and may be better suited to a qualified technician.
Is it safe to use my Samsung range while the IGBT Sensor Open error is active?
You should not continue using the range with this error active. The IGBT sensor exists to prevent the power inverter from overheating during induction cooking. Operating the range without a functioning temperature sensor removes that protection and could result in damage to the inverter module or other electronic components. Discontinue use until the fault is diagnosed and resolved.
Will resetting my Samsung range clear the IGBT Sensor Open error?
A power reset may temporarily clear the error display, but if the underlying cause is a failed sensor, a wiring fault, or a defective PCB, the error will return once the range attempts to operate. Resetting without addressing the root cause does not repair the fault. A persistent return of the error after reset confirms that a physical component issue needs to be corrected.
How much does it cost to repair the IGBT Sensor Open error on a Samsung range?
Repair costs vary depending on the failed component. If only the sub wire harness needs reseating, there may be no parts cost at all. Replacing the Assy-Inverter Module typically runs in the range of $80 to $200 or more for the part alone, depending on the specific model. Adding professional labor for diagnosis and installation can bring total repair costs to the range of $150 to $400. If the Assy Touch PCB is the defective component, costs will be in a similar range or higher.

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