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Error code reference

Samsung Range Error Code C-42

PCB temp sensor is shorted when the oven is operating.

Samsung codesSamsung range codes

PCB temp sensor is shorted when the oven is operating.

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-42 means on a Samsung range

The C-42 error code on a Samsung range indicates that the PCB temperature sensor has registered a shorted condition while the oven is in operation. The PCB temperature sensor is a thermistor or similar sensing component mounted directly on the main printed circuit board. Its purpose is to monitor the internal temperature of the control board itself, protecting the electronics from heat-related damage. When the sensor shorts, it sends an out-of-range or zero-resistance signal to the board's processor, which interprets this as a fault condition and triggers the C-42 code.

A shorted PCB temperature sensor means the sensor's internal resistance has collapsed to near zero ohms, causing the control board to read an implausibly extreme temperature value. This can occur due to physical damage to the sensor, solder joint failure on the board, moisture or grease contamination reaching the board, or heat stress that has degraded the sensor element itself. Because the sensor is integrated into or closely mounted to the main PCB assembly, isolating the sensor as a standalone replacement is generally not practical.

The prescribed first diagnostic step reflects this: disconnect power to the range, open the rear access panel, and replace the main PCB. Since the sensor is part of the PCB assembly and the fault is detected during oven operation, there is no intermediate adjustment or reset procedure that addresses the root cause. A full board replacement is the corrective action.

Source: manufacturer service documentation.

Common causes of C-42

  1. 01

    Failed PCB temperature sensor

    Part replacement

    The temperature sensor element on the main PCB has shorted internally, collapsing its resistance and sending an invalid signal to the processor. This is the direct cause identified by the C-42 code and requires PCB replacement.

  2. 02

    Heat stress damage to the PCB

    Part replacement

    Prolonged exposure to high oven temperatures or a ventilation obstruction can degrade solder joints and components on the control board, leading to sensor failure. Inspect the board for discolored or burnt areas near the sensor location.

  3. 03

    Moisture or grease contamination

    Part replacement

    Grease buildup or steam intrusion reaching the main PCB can cause conductive bridges that short the sensor circuit. Visible residue or corrosion on the board surface may indicate this as a contributing factor.

  4. 04

    Cracked or damaged solder joint

    Part replacement

    Vibration or thermal cycling can crack solder joints connecting the temperature sensor to the PCB traces, creating an unintended short or intermittent fault. This is typically not repairable without full board replacement.

See the test procedure for each cause

Frequently asked questions about C-42

What does C-42 mean on a Samsung range?
The C-42 code on a Samsung range means the temperature sensor on the main PCB has shorted while the oven is running. This sensor monitors the control board's own temperature to prevent heat damage. When it shorts, the board detects an invalid reading and stops normal operation. The fix requires replacing the main PCB.
Can I fix the C-42 error code myself?
A technically experienced DIYer can address this repair by disconnecting power, removing the rear access panel, and replacing the main PCB. The repair does not require specialized tools beyond basic hand tools and proper anti-static precautions when handling the board. However, if you are not comfortable working inside the appliance's electrical components, a qualified technician is recommended.
Is it safe to use my Samsung range when the C-42 code is showing?
You should not continue using the range while the C-42 code is active. The PCB temperature sensor is a protective component, and operating without a functioning sensor means the control board has no protection against overheating. Continuing to run the oven in this state risks further electrical damage to the appliance.
Will resetting my Samsung range clear the C-42 error?
A power reset may temporarily clear the code from the display, but it will not resolve the underlying shorted sensor condition. Because the sensor fault is a hardware failure on the main PCB, the C-42 code will return once the oven is operated again. Board replacement is required to permanently resolve the fault.
How much does it cost to fix a Samsung range C-42 error?
Repair costs depend on parts and labor in your area. A replacement main PCB for a Samsung range typically falls in the range of $100 to $300 for the part alone, depending on the model. If you hire a technician, expect additional labor charges that can bring the total to $200 to $500 or more. Getting a quote before proceeding is advisable, as in some cases the repair cost may approach the value of an older unit.

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