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Error code reference

Maytag Microwave Error Code E13

T1 Max time error

Maytag codesMaytag microwave codes

T1 Max time error — oven did not preheat properly.

First step from the service manual

Replace PCB assembly.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E13 means on a Maytag microwave

E13 on a Maytag microwave indicates a T1 Max Time error, meaning the control board monitored the preheat cycle and determined the oven cavity failed to reach the required temperature within the maximum allowable time window. The PCB assembly is the starting point for diagnosis because it governs temperature monitoring, timing logic, and the signals sent to the magnetron and heating components. A fault in the PCB can cause it to misread temperature data or fail to properly initiate or sustain the preheat sequence.

For homeowners, this error means your microwave started a cooking or preheat function but could not get up to temperature fast enough. Think of it as the appliance timing out while trying to warm up. The oven was not necessarily broken in a dangerous way, but it did not perform the preheat cycle correctly, and the control board shut things down as a safety measure.

This error can stem from a failed PCB assembly, a malfunctioning temperature sensor feeding incorrect data to the board, problems with the magnetron not generating sufficient heat output, or wiring issues between the PCB and the heating components. Diagnosing in sequence from the PCB outward is the recommended approach.

Source: manufacturer service documentation.

Common causes of E13

  1. 01

    Faulty PCB assembly

    Part replacement

    The PCB assembly controls the timing and temperature monitoring logic for the preheat cycle. If the board has failed or is sending incorrect signals, it may trigger the E13 error even when heating components are functioning correctly.

  2. 02

    Defective temperature sensor or thermistor

    Part replacement

    If the temperature sensor is out of calibration or has failed, it will report inaccurate readings to the PCB, causing the board to conclude the oven never reached the required preheat temperature within the allowed time.

  3. 03

    Weak or failing magnetron

    Part replacement

    The magnetron is responsible for generating the microwave energy that heats the oven cavity. A magnetron that is underperforming will produce insufficient heat output, causing the preheat cycle to time out and trigger E13.

  4. 04

    Damaged or loose wiring harness between PCB and heating components

    Wiring / connection

    Corroded, loose, or broken wiring connections between the control board and the heating or sensing components can interrupt the signals needed for proper preheat monitoring, resulting in a false or genuine E13 fault.

See the test procedure for each cause

Frequently asked questions about E13

What does the E13 error code mean on a Maytag microwave?
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.
Is it safe to use my Maytag microwave when the E13 error is showing?
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.
How do I fix the E13 error on a Maytag microwave?
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.
How much does it cost to repair the E13 error on a Maytag microwave?
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.
Can a bad temperature sensor cause the E13 code on a Maytag microwave?
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.

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