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Error code reference

Maytag Microwave Error Code Error 2

Humidity sensor thermistors are open or short-circuited, causing the unit to stop operating after…

Maytag codesMaytag microwave codes

Humidity sensor thermistors are open or short-circuited, causing the unit to stop operating after approximately 17 seconds.

First step from the service manual

Check connector S201 and measure resistance between pins of connector S201 (Pins #1-#3 and Pins #2-#3 should read about 2.5K ohms each at 20°C).

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

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What Error 2 means on a Maytag microwave

Error 2 on a Maytag microwave indicates a fault in the humidity sensor thermistor circuit. The control board monitors two thermistors within the humidity sensor assembly, checking resistance across connector S201 pins #1-#3 and pins #2-#3. At 20 degrees Celsius, each of those pin pairs should read approximately 2.5K ohms. When the control detects an open circuit (infinite resistance) or a short circuit (near-zero resistance) on either thermistor, it triggers Error 2 and halts operation after roughly 17 seconds of attempted use.

The humidity sensor is used during automatic cooking cycles to detect moisture levels released from food, allowing the microwave to adjust cook time dynamically. The thermistors inside this sensor change resistance in proportion to temperature and humidity conditions. A break in the circuit (open) or a direct short between the thermistor leads will produce readings far outside the expected 2.5K ohm range, which the control board interprets as a sensor failure.

Common causes include a damaged or corroded connector at S201, a broken thermistor lead inside the sensor assembly, or a failed humidity sensor unit itself. Because the fault is circuit-level, the first diagnostic step is always to inspect and measure at connector S201 before replacing the sensor. Wiring harness damage between the sensor and the control board can also produce this error, so continuity checks along the harness are an important part of the diagnostic process.

Source: manufacturer service documentation.

Common causes of Error 2

  1. 01

    Loose or corroded connector at S201

    Wiring / connection

    The connector at S201 is the first point to inspect. Corrosion, moisture intrusion, or a partially unseated connector can interrupt the circuit and produce open or out-of-range resistance readings without any damage to the sensor itself.

  2. 02

    Failed humidity sensor thermistor

    Part replacement

    One or both thermistors inside the humidity sensor assembly may have failed open or shorted internally. If resistance at pins #1-#3 or #2-#3 reads significantly above or below 2.5K ohms at room temperature, the sensor unit requires replacement.

  3. 03

    Damaged wiring harness between sensor and control board

    Part replacement

    Physical damage, heat exposure, or chafing along the wiring harness can break a conductor or create a short between wires. A continuity check along the full harness from connector S201 to the control board will identify this condition.

  4. 04

    Moisture or food debris contaminating the sensor

    Wiring / connection

    Steam and food splatter inside the cavity can infiltrate the humidity sensor over time, altering thermistor resistance or causing intermittent shorts. Inspect the sensor body for visible contamination or moisture residue.

  5. 05

    Control board fault misreading the sensor circuit

    Part replacement

    If connector S201 is secure and resistance at both pin pairs measures correctly at approximately 2.5K ohms, the control board itself may be interpreting the signal incorrectly due to an internal board failure. This is the least common cause and should be diagnosed only after the sensor and wiring are confirmed good.

See the test procedure for each cause

Frequently asked questions about Error 2

What does Error 2 mean on a Maytag microwave?
Error 2 indicates that the control board has detected an open or short circuit in the humidity sensor thermistor circuit. The microwave measures resistance at connector S201 and expects approximately 2.5K ohms across each thermistor at 20 degrees Celsius. When the readings fall outside acceptable limits, the unit stops operating after about 17 seconds to prevent further issues.
Can I fix Error 2 on my Maytag microwave myself?
A knowledgeable DIYer can start by inspecting and reseating connector S201 and measuring resistance across the specified pins with a multimeter. If the connector is secure and readings are correct, the humidity sensor or wiring harness may need replacement. However, microwave capacitors can hold a lethal charge even when unplugged, so internal repairs should only be attempted by those familiar with high-voltage appliance safety procedures.
Is it safe to keep using my Maytag microwave when Error 2 appears?
The microwave is designed to shut itself off after approximately 17 seconds when Error 2 is active, so continued normal use is not possible. You should not attempt to bypass or ignore this shutdown. The fault should be diagnosed and repaired before returning the unit to service.
Will resetting the microwave clear Error 2?
Unplugging the microwave and restoring power may temporarily clear the display, but the error will return once the control board checks the sensor circuit again. Because Error 2 points to a specific electrical fault in the humidity sensor circuit, a reset alone will not resolve the underlying problem. The sensor, connector, and wiring need to be inspected and tested.
How much does it cost to repair Error 2 on a Maytag microwave?
If only the connector at S201 needs cleaning or reseating, the repair may cost little to nothing beyond diagnostic time. Replacing the humidity sensor typically runs in the range of 30 to 80 dollars for the part, with labor adding 80 to 150 dollars if a technician performs the work. A full control board replacement, if needed, can push total repair costs into the 150 to 300 dollar range depending on the model.

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