Maytag Microwave Error Code E5

The E5 error code on Maytag microwave models AMC5143AA* and MMC5193AA* indicates that the humidity or temperature sensor used for automatic cooking functions has developed a short circuit condition. The sensor in these models monitors cooking progress by detecting changes in humidity or heat levels inside the cavity, allowing the microwave to automatically adjust cook times. When the sensor's internal resistance drops abnormally low due to a short, the control board detects an out-of-range signal and halts operation to prevent incorrect cooking results or component damage.

A shorted sensor typically means the sensor element itself has failed internally, or that moisture, food debris, or a wiring fault has created an unintended electrical path between the sensor leads. This can happen after spills inside the cavity, steam exposure over time, or simply age-related degradation of the sensor components. The control board interprets a shorted sensor as an invalid reading, distinguishing it from an open circuit failure, which would trigger a different fault code.

The first recommended diagnostic step is to allow the oven to cool for 10 minutes before further evaluation. This is important because elevated internal temperatures can temporarily affect sensor readings, and cooling the unit may resolve a heat-induced false short. If the E5 code returns after the oven has fully cooled, the sensor itself or its wiring harness should be inspected and tested for a true short condition.