Samsung Washer 20 Error Code: Causes and Fixes

The C-20 error on your Samsung microwave means there is a gas sensor error. This error indicates a malfunction in the microwave’s gas sensor system, which is designed to detect gas leaks for safety purposes, and requires professional service.

What the C-20 error means

The C-20 error code indicates a problem with your Samsung microwave’s gas sensor system. This sensor is a safety feature designed to detect potential gas leaks in combination microwave-gas range units or over-the-range microwaves installed above gas cooktops. When the sensor detects an issue or malfunctions, the microwave automatically stops operation to prevent potential safety hazards. This is a critical safety feature that prevents the microwave from running when there may be a gas-related concern.

Common causes

• Faulty or failed gas sensor component requiring replacement
• Loose or corroded wiring connections between the gas sensor and control board
• Moisture or debris accumulation on the gas sensor affecting its operation
• Control board malfunction causing false sensor readings
• Power surge or electrical issue that damaged the sensor circuit
• Manufacturing defect in the gas sensor assembly

How to fix the C-20 error

1. Perform a hard reset: Unplug the microwave from the electrical outlet or turn off the circuit breaker for 5 minutes. This allows the control board to reset completely. Restore power and check if the error clears. If the error persists immediately, proceed to the next steps.
2. Check for visible issues: If you’re comfortable doing so, unplug the unit and remove the outer casing to inspect the gas sensor and its wiring connections. Look for any loose connections, corroded wires, or visible damage to the sensor. Do not attempt repairs if you’re not experienced with appliance repair.
3. Clean the sensor area: If accessible, gently clean around the gas sensor with a dry cloth to remove any dust or debris that might be interfering with its operation. Avoid using liquids or cleaners directly on electronic components.
4. Document warranty status: Check your microwave’s purchase date and warranty information. The C-20 error often indicates a component failure that may be covered under warranty, especially if the unit is relatively new.
5. Contact Samsung support: Call Samsung customer service at 1-800-726-7864 to report the C-20 error. They can provide specific troubleshooting for your model and arrange warranty service if applicable.
6. Schedule professional repair: Contact a qualified appliance repair technician who specializes in Samsung microwaves. The gas sensor or control board will likely need professional diagnosis and replacement, which typically costs $150–$350 depending on the required parts.

FAQ

Can I continue using my microwave with the C-20 error?
No, you should not use your microwave when the C-20 error appears. This error indicates a gas sensor malfunction, which is a critical safety feature. The microwave will not operate until the issue is resolved to prevent potential safety hazards.

Is the C-20 error something I can fix myself?
While you can attempt a basic reset, the C-20 error typically requires professional repair. The gas sensor is a specialized safety component that needs proper diagnosis and replacement by a qualified technician. Attempting DIY repairs on gas-related safety systems can void your warranty and create safety risks.

How much does it cost to repair a C-20 error on a Samsung microwave?
Professional repair for a C-20 error typically costs between $150 and $350, depending on whether the gas sensor or control board needs replacement. The gas sensor part alone costs $50–$120, while labor adds $100–$200. If your microwave is under warranty, the repair may be covered at no cost.