Samsung Microwave Error Code E-12

E-12 on a Samsung microwave indicates a temperature sensor short error. The control board monitors the analog-to-digital output value from the temperature sensor, and when that value drops below the minimum acceptable threshold, the board registers a short circuit and cancels operation. The microwave will not function normally until the sensor or its wiring is inspected and repaired.

No, you should not attempt to use the microwave while E-12 is active. The error puts the unit into cancel mode specifically to prevent operation without reliable temperature feedback. Running the microwave without a functioning temperature sensor could allow the cavity to overheat without detection, creating a potential fire or appliance damage risk.

Repair costs depend on what component has failed. A replacement temperature sensor is typically a lower-cost part, with the sensor itself generally ranging from around $15 to $50 depending on the model. If the control board (PCB) needs replacement, parts alone can range from $80 to $200 or more. Adding professional labor typically brings the total repair cost to somewhere between $100 and $300, which should be weighed against the age and replacement cost of the microwave.

A knowledgeable DIYer can start by checking the sensor connector at the PCB for looseness or corrosion, which requires no special tools and may resolve the issue immediately. If the connector is secure, testing the thermistor with a multimeter is the next step. Replacing the sensor or the control board involves working inside the microwave cabinet, which should only be done after unplugging the unit and allowing the high-voltage capacitor to discharge fully, since stored charge can be lethal even with power removed.

A reset, such as unplugging the microwave for a few minutes and restoring power, may temporarily clear the error display. However, if the underlying cause is a shorted or failed temperature sensor, the E-12 code will return as soon as the microwave attempts to use the sensor during operation. A reset is only a useful first step to rule out a transient glitch, not a permanent solution.