mypros+
Error code reference

Samsung Range Error Code Low Voltage

Low voltage error

Samsung codesSamsung range codes

Low voltage error - DC 12V dropped under 9V 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 sub wire sequence matches PCB schematic. Check SMPS DC line for shorted or open circuit.

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

MyPros+ Max

Get the full diagnostic procedure for Low Voltage.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What Low Voltage means on a Samsung range

The Low Voltage error on a Samsung range indicates that the DC 12V power supply line has dropped below 9V. This voltage rail is generated by the Switch Mode Power Supply (SMPS) circuit on the main PCB and is used to power the control board and touch interface. When the voltage falls outside the acceptable threshold, the system triggers this fault to protect the electronics from operating under abnormal power conditions.

The error typically points to a problem within the PCB assembly itself or in the wiring that connects the main PCB to the touch control PCB. A shorted or open circuit on the SMPS DC line is a primary suspect, as either condition disrupts the regulated voltage output. A short can pull the voltage below the operating floor, while an open circuit can cause erratic or collapsed voltage readings at the receiving board.

The sub wire connecting the main PCB assembly to the touch PCB assembly is also a critical checkpoint. If this wire is disconnected, damaged, or improperly sequenced relative to the PCB schematic, the voltage signal will not reach the touch board correctly, and the low voltage fault will be logged. Technicians should verify both the physical connection and the pin-out sequence of this sub wire before condemning either PCB.

Source: manufacturer service documentation.

Common causes of Low Voltage

  1. 01

    SMPS DC Line Short Circuit

    Part replacement

    A short circuit on the 12V DC line produced by the Switch Mode Power Supply pulls the voltage below the 9V minimum threshold. Check the SMPS output line for continuity issues and signs of damage on the PCB.

  2. 02

    SMPS DC Line Open Circuit

    Part replacement

    An open circuit on the SMPS DC line interrupts voltage delivery to downstream components. Inspect the PCB traces and wiring for breaks or burnt connections that would cause voltage to collapse.

  3. 03

    Disconnected Sub Wire Between PCBs

    Wiring / connection

    If the sub wire running from the main PCB assembly to the touch PCB assembly is loose or unplugged, the voltage signal cannot reach the touch board and the error will trigger. Reseat the connector firmly on both ends.

  4. 04

    Incorrect Sub Wire Pin Sequence

    Wiring / connection

    A mis-wired or reversed sub wire connector will prevent proper voltage communication between the main PCB and the touch PCB. Compare the installed wiring sequence against the PCB schematic to confirm correct orientation.

  5. 05

    Faulty Main PCB or Touch PCB Assembly

    Part replacement

    Internal component failure on either the main PCB or the touch PCB can cause the 12V rail to drop below acceptable levels. If wiring checks pass and the SMPS line shows no shorts or opens, one or both boards may need replacement.

See the test procedure for each cause

Frequently asked questions about Low Voltage

What does Low Voltage mean on a Samsung range?
The Low Voltage error means the internal DC 12V power supply line has dropped below 9V. This voltage is generated by the Switch Mode Power Supply on the main control board and powers both the main PCB and the touch control PCB. The fault is triggered to prevent the electronics from operating under unsafe power conditions. The cause is typically a shorted or open SMPS line, or a wiring issue between the two PCB assemblies.
Can I fix the Low Voltage error on my Samsung range myself?
Some causes, such as a loose or disconnected sub wire between the main PCB and touch PCB, can be addressed by a knowledgeable DIYer comfortable working with appliance electronics. However, diagnosing a short or open circuit on the SMPS DC line and replacing control board components requires technical skill and proper equipment. If you are not experienced with electronics diagnostics, a qualified appliance technician is recommended.
Is it safe to use my Samsung range while the Low Voltage error is displayed?
You should avoid using the range while this error is active. A voltage fault indicates an abnormal condition within the control electronics, and continued operation could lead to further component damage. The range controls may also behave unpredictably when the power supply voltage is out of specification. Discontinue use and have the unit inspected before cooking again.
Will resetting my Samsung range clear the Low Voltage error?
A power reset by unplugging the range or cycling the breaker may temporarily clear the error display, but it will not resolve the underlying cause. If the voltage on the SMPS DC line remains below 9V or the wiring fault is still present, the error will return once the unit powers back on. A proper repair of the faulty component or wiring is required for a permanent fix.
How much does it cost to repair a Low Voltage error on a Samsung range?
Repair costs depend on what component is faulty. If only the sub wire needs to be reseated or replaced, costs are relatively low, typically in the range of $50 to $150 for a service call. If the main PCB or touch PCB assembly requires replacement, parts and labor combined can range from $200 to $500 or more depending on the specific model and local labor rates.

Related Samsung range codes

All Samsung range codes
View all 72 Samsung range codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass