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Error code reference

Samsung Range Error Code Low Voltage Error

DC 12V has dropped under 9V, possibly due to defects of PCB or wiring.

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DC 12V has dropped under 9V, possibly due to defects of PCB or wiring.

First step from the service manual

Check if sub wire is connected from Assy PCB Parts to Assy Touch PCB; check if SMPS DC line has shorted or opened circuit.

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

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What Low Voltage Error means on a Samsung range

The Low Voltage Error on a Samsung range indicates that the DC 12V supply line has dropped below 9V. This voltage rail is generated by the Switch Mode Power Supply (SMPS) circuit located on the main PCB assembly and is used to power control board logic, the touch interface PCB, and associated low-voltage circuitry. When this rail falls outside the acceptable threshold, the control system detects the undervoltage condition and triggers the fault to prevent erratic or unsafe operation.

The two primary failure points are the SMPS DC output line itself and the sub-wire harness that connects the main PCB assembly to the touch PCB assembly. A shorted or open circuit anywhere along this wiring path can cause a voltage drop significant enough to trigger the error. In some cases, the SMPS section of the main PCB fails internally due to a failed capacitor, diode, or transistor within the power conversion circuit, resulting in insufficient regulated output voltage.

Diagnosis begins by confirming that the sub-wire harness between the main PCB and the touch PCB is fully seated and undamaged. From there, technicians should measure the DC 12V output from the SMPS circuit under load to determine whether the voltage is within spec. If the line reads below 9V with confirmed good wiring, the PCB assembly with the integrated SMPS is the likely failed component.

Source: manufacturer service documentation.

Common causes of Low Voltage Error

  1. 01

    Loose or disconnected sub-wire harness

    Wiring / connection

    The wire harness connecting the main PCB assembly to the touch PCB can work loose over time or become unseated during prior service. Check that both ends of the sub-wire connector are fully seated and that no pins are bent or corroded.

  2. 02

    SMPS DC output shorted to ground

    Part replacement

    A short circuit on the 12V DC line pulls the voltage below the 9V threshold and triggers the fault. Inspect the wiring harness and board traces for signs of pinching, burning, or contact with the chassis.

  3. 03

    Open circuit in SMPS DC wiring

    Part replacement

    A broken wire or failed connector in the DC output path from the SMPS section creates an open circuit condition that drops voltage. Use a multimeter to test continuity across the 12V supply wiring from the PCB to the touch panel.

  4. 04

    Failed SMPS circuit on main PCB

    Part replacement

    Internal failure of the switch mode power supply components on the main PCB, such as capacitors, rectifier diodes, or switching transistors, can result in insufficient regulated 12V output. If wiring checks out and voltage is still low under load, the PCB assembly requires replacement.

  5. 05

    Damaged touch PCB drawing excess current

    Part replacement

    A fault within the touch PCB assembly can cause it to draw more current than the SMPS is rated to supply, loading down the 12V rail below the 9V cutoff. Disconnecting the touch PCB and checking whether voltage recovers can help isolate this cause.

See the test procedure for each cause

Frequently asked questions about Low Voltage Error

What does Low Voltage Error mean on a Samsung range?
The Low Voltage Error means the internal DC 12V power supply rail has dropped below 9V, which is the minimum threshold for reliable control board operation. The fault is triggered by the PCB monitoring circuit to prevent erratic behavior from undervoltage conditions. The cause is typically a wiring fault or a failing switch mode power supply on the main control board.
Can I fix the Low Voltage Error on my Samsung range myself?
A knowledgeable DIYer can check whether the sub-wire harness between the main PCB and the touch PCB is fully connected and undamaged, which requires no special tools. Measuring DC voltage output from the SMPS circuit requires a multimeter and comfort working around electronics. If the PCB itself has failed, replacement involves working with line voltage components and is best handled by a qualified technician.
Is it safe to use my Samsung range while the Low Voltage Error is active?
It is not recommended to continue using the range while this error is present. An undervoltage condition on the control board can cause unpredictable behavior from the control electronics, including improper operation of heating elements. The range should be powered off at the breaker until the fault is diagnosed and corrected.
Will resetting my Samsung range clear the Low Voltage Error?
A power cycle by switching off the circuit breaker for one to two minutes may temporarily clear the error display, but the fault will return if the underlying cause is still present. The error is tied to an active hardware condition, specifically a voltage reading below 9V, so it will persist or reappear until the wiring or PCB issue is resolved.
How much does it cost to repair a Samsung range Low Voltage Error?
If the fix is simply reseating a loose wire harness, there may be no parts cost and only a service call fee, typically in the range of $75 to $150. If the main PCB assembly requires replacement, parts alone can range from $150 to $400 depending on the specific model, with labor adding to that total. Getting a diagnosis before ordering parts is advisable to confirm which component has failed.

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