What does Samsung Range C-20 Error Code - Causes & Fix mean?

C-20 on a Samsung range means oven sensor malfunction. Most common fix: replace the oven temperature sensor probe or repair damaged wiring.

How do I fix Samsung Range C-20 Error Code - Causes & Fix?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Can I keep running the equipment with 20 active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for Samsung Range C-20 Error Code - Causes & Fix?

The most frequently replaced parts for Samsung Range C-20 Error Code - Causes & Fix are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is Samsung Range C-20 Error Code - Causes & Fix a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

Samsung Range C-20 Error Code - Causes & Fix

Samsung Range C-20 Error Code — What It Means

The C-20 code on a Samsung range indicates an oven sensor malfunction. Samsung groups C-20, C-21, and C-22 together under sensor faults. This code specifically points to a problem with the oven temperature sensor circuit, which means the control board cannot read accurate temperature from the probe inside the oven cavity.

The error typically appears when the sensor probe has failed, wiring has been damaged, or a connector has come loose or corroded. Samsung’s official guidance is to turn the oven off, restart it, and if the code returns, remove power for 30 seconds or more. If the code persists after that reset, the sensor circuit needs diagnosis and repair.

Jump to Fix

Common Causes

Failed oven temperature sensor The sensor probe inside the oven cavity has drifted out of its normal resistance range or failed open or shorted.
Damaged sensor wiring harness Wires between the sensor and control board are broken, shorted together, or chewed through by rodents.
Loose or corroded connectors Plug terminals at the sensor or control board end have oxidized, burned, or worked loose over time.
Control board sensor-input fault The main PCB has a failed input circuit that cannot read the sensor correctly, even when the probe and wiring test good.

Step-by-Step Fix

Disconnect power at the breaker or unplug the range before any disassembly or testing.
Verify supply voltage at the wall receptacle with a multimeter to confirm proper line voltage is reaching the range.
Access and inspect the oven temperature sensor at the rear wall of the oven cavity, then trace the wiring harness along the back or top of the cabinet for visible damage, rodent chewing, or burned insulation.
Check all connectors at both the sensor probe and the control board end for looseness, corrosion, melting, or pushed-back terminals.
Measure the resistance of the oven sensor using an ohmmeter at room temperature and compare to your model’s specification table (consult service documentation for the expected range).
Replace the oven temperature sensor if resistance is out of range, open, or shorted, or if the sensor shows erratic readings when wiggled.
Repair or replace damaged wiring if the probe tests correctly but you found breaks, shorts, or corroded terminals in the harness.
Clear stored codes by removing power for one minute, restore power, run the oven through a test cycle, and confirm the C-20 does not return.

Parts Often Needed

Part	Notes
Samsung oven temperature sensor / probe	Amazon \| Match by model number. Mounts to the rear oven cavity wall with a bracket or clip.
Sensor wiring harness or pigtail repair kit	Amazon \| Use if wires are cut or terminals are burned. OEM connector kits make sure proper fit.
Main control board / PCB	Amazon \| Replace only after confirming sensor and wiring test good and code persists.

When to Call a Pro

If you are not comfortable working with 240-volt circuits or cannot safely access the back panel and wiring, call a qualified appliance technician. Also call if you have replaced the sensor and verified all wiring and connectors are intact but the C-20 code still appears, since that points to a control board fault that requires bench-level diagnosis. A technician can also enter Samsung’s diagnostic mode to read fault history and confirm the exact sensor-circuit failure before ordering parts.