Samsung Microwave E-26 Error — What It Means
Samsung defines the E-26 error code as ‘Temperature Not Over AD Error.’ In practical terms, the microwave’s control board did not detect the expected temperature rise from the temperature sensor circuit during a monitored or sensor cook cycle. This is a sensor-related fault, not a door-lock issue (despite some third-party sources labeling it that way). The control board is looking for a temperature signal and not finding it, so the problem lies in the temperature-sensing path: the sensor itself, the wiring between the sensor and control, or the control board’s input circuit. It is not a user-resettable condition in most cases.
Common Causes
- Open or shorted temperature sensor The thermistor or temperature sensor has failed internally and no longer provides a valid resistance signal to the control board.
- Loose, corroded, or damaged connectors The plug connecting the sensor harness to the control or sensor has oxidized pins, poor pin fit, or heat damage that breaks the signal path.
- Harness damage between sensor and control Wiring insulation has melted, been pinched, or broken anywhere along the temperature-sensor circuit, creating an open or intermittent connection.
- Failed main control board input section The control board’s temperature-sensing input has failed even though the sensor and wiring test correctly, so the board cannot read the signal.
Step-by-Step Fix
- Disconnect power by unplugging the microwave or turning off the breaker for at least 60 seconds, then restore power and check if the code clears.
- Remove the outer case panels to access the internal cavity and locate the temperature sensor, which is typically mounted on the cavity wall or near the magnetron with a two-pin connector.
- Inspect the sensor and its harness for visible damage such as melted insulation, broken wires, corrosion on the connector pins, or loose pin fit at both the sensor and control-board ends.
- Test the temperature sensor with a multimeter set to resistance (ohms) and compare the reading at room temperature to the service data for your exact model, or check for infinite resistance (open) or zero resistance (shorted), both of which indicate a failed sensor.
- Check continuity of the wiring from the sensor connector to the control board connector using the multimeter’s continuity function to verify no breaks or high-resistance joints in the harness.
- Replace the temperature sensor if it tests outside normal range or if the wiring and connectors are intact but the code persists, then reassemble and test a cook cycle.
- Replace the main control board if the sensor and wiring both test correctly and the E-26 code returns, since the fault is now isolated to the board’s sensor-input circuit.
Parts Often Needed
| Part | Notes |
|---|---|
| Samsung microwave temperature sensor / thermistor | Amazon | Match the part number to your exact model number for proper fit and calibration. |
| Samsung microwave main control board | Amazon | Only needed if sensor and wiring test good but the code remains after sensor replacement. |
When to Call a Pro
Call a qualified appliance technician if you are not comfortable working inside the microwave cabinet, which requires discharging the high-voltage capacitor and avoiding magnetron and transformer connections. A technician has the service manual with model-specific resistance tables and voltage checks to pinpoint the fault quickly. If you replace the sensor and wiring but the E-26 code returns, the control board input is likely at fault and a pro can verify that diagnosis before you invest in a new board.