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Error code reference

Samsung Range Error Code C-43

PCB temperature rises abnormally high.

Samsung codesSamsung range codes

PCB temperature rises abnormally high.

First step from the service manual

Disconnect power. Open back cover. Replace the main PCB.

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

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What C-43 means on a Samsung range

The C-43 error code on a Samsung range indicates that the main PCB (printed circuit board) has detected an abnormally high internal temperature. The PCB contains onboard thermal monitoring circuitry that tracks its own operating temperature. When that temperature climbs beyond the acceptable threshold, the control board triggers C-43 to alert the user and prevent further damage to the electronics.

The most direct cause is a failure within the PCB itself, such as a failing voltage regulator, a shorted component, or degraded thermal management on the board. These internal failures generate excess heat that the board's own sensor detects. In some cases, inadequate ventilation around the control board due to a blocked air path or a failed cooling fan in the range can contribute to heat buildup, but the primary suspect remains the main PCB and its internal components.

Because the diagnostic procedure calls for replacing the main PCB after disconnecting power and opening the back cover, this error is treated as a board-level failure rather than a wiring or sensor issue. Attempting to operate the range while C-43 is active risks further damage to the control system and potentially other connected components. Power should be disconnected immediately and the board assessed for visible signs of burning, bulging capacitors, or heat-damaged traces before proceeding with replacement.

Source: manufacturer service documentation.

Common causes of C-43

  1. 01

    Failed or degraded main PCB

    Part replacement

    Internal component failure on the control board, such as a shorted voltage regulator or failing capacitors, causes the board to generate excessive heat. Visible signs may include burn marks, bulging capacitors, or a burnt smell near the back of the range.

  2. 02

    Blocked ventilation around the control board

    Wiring / connection

    If the area around the main PCB is obstructed by debris, grease buildup, or improper installation, heat cannot dissipate normally and the board temperature rises. Inspect the back panel and surrounding area for obstructions after disconnecting power.

  3. 03

    Failed internal cooling fan

    Part replacement

    Some Samsung ranges use a cooling fan to regulate electronics temperature. If this fan has seized or failed, airflow to the PCB stops and temperatures climb rapidly. Listen for fan operation during normal use to help identify this issue.

  4. 04

    Short circuit in a connected component

    Part replacement

    A short in a component wired to the main PCB, such as a relay or connected harness, can cause abnormal current draw that generates excess heat on the board. Inspect wiring harness connectors for melting or discoloration.

See the test procedure for each cause

Frequently asked questions about C-43

What does C-43 mean on a Samsung range?
C-43 means the main PCB (control board) in your Samsung range has detected that its internal temperature has risen to an abnormally high level. The board has built-in thermal monitoring that triggers this code to prevent further damage. The range should be powered off immediately and not used until the issue is resolved.
Can I fix C-43 on my Samsung range myself?
The diagnostic procedure requires disconnecting power, opening the back cover of the range, and replacing the main PCB. A knowledgeable DIYer with experience working on appliance electronics can perform this repair, but it does require comfort with disassembling the unit and handling circuit board components. If you are unsure, a certified appliance technician is the safer choice.
Is it safe to keep using my Samsung range when C-43 appears?
No, you should not continue using the range when C-43 is active. An overheating control board can sustain permanent damage and may pose a risk to other connected components. Disconnect power to the range until the main PCB has been inspected and replaced as needed.
Will resetting my Samsung range clear the C-43 error?
A power reset may temporarily clear the code, but if the underlying cause is a failing or overheated main PCB, the error will return once the board heats up again. Resetting without addressing the root cause does not fix the problem and could lead to further damage to the control board.
How much does it cost to fix a Samsung range C-43 error?
The primary repair involves replacing the main PCB. Parts costs for a Samsung range control board typically fall in the range of $100 to $300 or more depending on the specific model. If you hire a technician, labor costs will add to that total, bringing the overall repair cost to roughly $200 to $500 or higher in some cases.

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