KitchenAid Microwave Error Code E1

E1 means the control board has detected a problem with the temperature sensor circuit. Depending on where the code appears on the display, it indicates either an open temperature sensor (broken circuit) or a shorted one. The sensor should measure around 1080 ohms at 70°F, and the control flags E1 when the reading falls outside the expected range.

No. The microwave has stopped normal operation because it cannot reliably monitor internal temperature. Running it in this state risks overheating, especially if a welded relay is the underlying cause. Do not bypass or ignore the error until the fault is diagnosed and repaired.

Yes. A disconnected or corroded connector at the temperature sensor creates an open circuit that the control board interprets as a failed sensor, triggering E1 even when the thermistor itself is in good condition. Always check the sensor wiring connection before purchasing a replacement part.

Start by unplugging the microwave and inspecting the wiring connector at the temperature sensor for looseness or corrosion. Then measure the sensor's resistance with a multimeter. At 70°F it should read approximately 1080 ohms, adding about 2 ohms per degree above that. If resistance is out of range, replace the sensor. If the sensor and wiring both check out, inspect the control board for a relay that may have welded closed, as this can cause overtemperature conditions that trigger E1.

If only the temperature sensor needs replacing, the part typically costs between $20 and $60 depending on the model, and the repair is manageable for a careful DIYer comfortable working with appliances after unplugging them. If the control board needs replacement due to a welded relay or failed input circuit, the part alone can run $100 to $250 or more, making professional diagnosis worthwhile before purchasing the board.