Encountering the “C20” error code on your Samsung microwave can be frustrating. This code indicates a problem with the temperature sensor. This post will guide you through the potential causes and troubleshooting steps to resolve the Samsung microwave C20 error code.
Understanding the Samsung Microwave C20 Error Code:
The C20 error code specifically points to a fault in the microwave’s temperature sensor circuit. This fault can arise from:
- Open or Shorted Temperature Sensor: The sensor itself may be damaged, leading to an open circuit (no continuity) or a short circuit (direct connection).
- Loose or Improperly Seated Connector: The connection between the temperature sensor and the main PCB (Printed Circuit Board) might be loose or disconnected.
Troubleshooting Steps for the Samsung Microwave C20 Error Code:
Important Safety Precautions:
- Disconnect Power: Before performing any troubleshooting, ensure the microwave is unplugged from the power outlet to prevent electrical shock.
- Capacitor Discharge: Microwave ovens contain high-voltage capacitors that can store a dangerous charge even after being unplugged. If you are unfamiliar with safely discharging these capacitors, it is best to seek professional repair.
1. Check the connector:
- Locate the main PCB inside the microwave.
- Identify the connector labeled “CN302.”
- Verify that the temperature sensor connector is securely seated at pins 1-3 of CN302.
- If the connector is loose, gently push it back into place.
2. Test the Temperature Sensor Resistance:
- Disconnect the temperature sensor’s terminal from the main PCB.
- Use a multimeter set to measure resistance (Ohms).
- Place the multimeter probes across the terminals of the temperature sensor.
- Compare the measured resistance value with the temperature sensor chart provided below.
Temperature Sensor Resistance Chart:
| Temperature (°F) | Resistance (kΩ) |
|---|---|
| 77 | 236.16 |
| 86 | 187.29 |
| 95 | 149.49 |
| 104 | 120.05 |
| 113 | 96.98 |
| 122 | 78.79 |
| 131 | 64.36 |
| 140 | 52.56 |
| 149 | 42.01 |
| 158 | 36.19 |
| 167 | 30.17 |
| 176 | 25.26 |
| 185 | 21.24 |
| 194 | 17.94 |
| 203 | 15.21 |
| 212 | 12.95 |
| 221 | 11.07 |
| 230 | 9.49 |
| 239 | 8.17 |
| 248 | 7.06 |
| 257 | 6.12 |
| 266 | 5.32 |
| 275 | 4.63 |
| 284 | 4.06 |
| 293 | 3.56 |
| 302 | 3.13 |
| 329 | 2.17 |
| 338 | 1.93 |
| 347 | 1.72 |
| 356 | 1.53 |
| 365 | 1.37 |
| 374 | 1.23 |
| 383 | 1.11 |
| 392 | 1.00 |
| 401 | 0.90 |
| 410 | 0.82 |
| 419 | 0.74 |
| 428 | 0.67 |
| 437 | 0.61 |
| 446 | 0.56 |
| 455 | 0.51 |
| 464 | 0.46 |
| 473 | 0.42 |
| 482 | 0.39 |
| 491 | 0.36 |
| 500 | 0.33 |
| 509 | 0.30 |
| 518 | 0.28 |
| 527 | 0.26 |
| 536 | 0.24 |
| 545 | 0.22 |
| 554 | 0.20 |
Note: The resistance values are approximate and may vary slightly.
- If the measured resistance deviates significantly from the chart, the temperature sensor is likely faulty and needs replacement.
3. Main PCB Issues:
- If the sensor and connector are both functioning correctly, the issue might lie with the main PCB itself. This requires a more in-depth diagnosis and potentially professional repair.
Conclusion:
By checking the temperature sensor and its connections, you can often resolve the C20 error code on your Samsung microwave oven.
I am a master Appliance Repair technician with over 35 years of experience in the field. I am passionate about helping people troubleshoot their appliances and fix common problems. My website, appliancemode.com, provides a wealth of information on troubleshooting common appliance issues and deciphering error codes. This website aims to empower people to tackle appliance repairs themselves and save money on service calls.
