Maytag Microwave Error Code E13

E13 is a T1 Max Time error, meaning the microwave's control board detected that the oven did not complete its preheat cycle within the maximum allowed time. The PCB assembly monitors temperature during preheat, and when the target temperature is not reached in time, the board logs E13 and halts operation. This can point to a PCB fault, a bad temperature sensor, a failing magnetron, or a wiring issue.

Start by unplugging the microwave for at least 60 seconds to clear any temporary fault, then restore power and test. If E13 returns, inspect the PCB assembly first, as this is the primary diagnostic step. From there, check the temperature sensor for proper resistance values and inspect the wiring harness for loose or corroded connections. If the magnetron tests weak or the PCB shows visible damage, those components will need replacement. A technician with a multimeter can work through this sequence in a single service call.

Yes. If the temperature sensor or thermistor is reading incorrectly, the PCB assembly will receive inaccurate temperature data during the preheat cycle. The board then concludes the oven never reached the required temperature within the maximum time window and triggers E13. Testing the sensor with a multimeter for its rated resistance at room temperature will confirm whether it is within spec or needs replacement.

You should not continue using the microwave while E13 is active. The error indicates the oven failed a preheat cycle, which means the appliance did not operate within its designed parameters. Running it in this condition risks incomplete cooking and could mask an underlying component failure such as a degraded magnetron, which can worsen with continued use.

Repair cost depends on which component has failed. A replacement temperature sensor is typically a lower-cost part and can be a DIY repair with basic tools. A new PCB assembly is a mid-range expense and more involved to replace, though still a feasible DIY job for someone comfortable with appliance repair. A magnetron replacement is the most expensive scenario and, combined with labor, can approach or exceed the cost of a new mid-range microwave, making it worth evaluating whether repair or replacement makes more financial sense.