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Error code reference

Maytag Microwave Error Code Error 1

Shorted circuit detected by humidity sensor (Model MMC5080AA*).

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Shorted circuit detected by humidity sensor (Model MMC5080AA*).

First step from the service manual

Allow oven to cool for 5 minutes, then check connection of wire at sensor.

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

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What Error 1 means on a Maytag microwave

Error 1 on the Maytag MMC5080AA microwave indicates that the control board has detected a shorted circuit in the humidity sensor system. The humidity sensor, also called a moisture sensor, monitors steam levels inside the oven cavity during cooking cycles. When this sensor or its associated wiring develops a short circuit, the resistance across the sensor circuit drops abnormally low, triggering the fault code. This is a protective shutdown designed to prevent the control board from receiving false cooking data or sustaining electrical damage.

The humidity sensor operates by measuring moisture in the exhaust airflow and sending a corresponding signal back to the control board. A short circuit in this path can originate at the sensor itself, at the wire harness connector, or along the wiring between the two. Heat from extended cooking cycles is a known contributor to connector degradation and insulation breakdown, which is why the first diagnostic step involves allowing the unit to cool for five minutes before inspecting the sensor wire connection.

After cooling, technicians should inspect the wire harness connector at the humidity sensor for signs of melting, corrosion, pushed-back terminals, or contact bridging. If the connector checks out, resistance testing across the sensor terminals can confirm whether the sensor itself has failed internally. A shorted sensor will typically read near zero ohms rather than the expected resistance range for the component. If wiring and connectors are intact, sensor replacement is generally the next step.

Source: manufacturer service documentation.

Common causes of Error 1

  1. 01

    Loose or corroded sensor wire connector

    Wiring / connection

    Heat cycling can cause the wire harness connector at the humidity sensor to loosen, corrode, or develop bridged contacts. Inspecting and reseating the connector after the unit cools is the first recommended diagnostic action.

  2. 02

    Failed humidity sensor (internal short)

    Part replacement

    The humidity sensor itself can fail internally, producing a near-zero resistance reading across its terminals. This is confirmed with an ohmmeter after the connector and wiring have been ruled out.

  3. 03

    Damaged or pinched sensor wiring

    Part replacement

    The wire harness leading to the humidity sensor can develop insulation damage from heat exposure or from being pinched during a previous repair or installation, creating a short to ground or between conductors.

  4. 04

    Moisture or condensation in the connector

    Wiring / connection

    Excess steam or condensation inside the microwave cavity can enter the sensor connector and cause a temporary short circuit. This may resolve after thorough drying but can cause permanent corrosion if left unaddressed.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the control board itself may falsely detect a short due to a failed input circuit. This is typically only considered after the sensor, connector, and wiring have all been tested and found to be within specification.

See the test procedure for each cause

Frequently asked questions about Error 1

What does Error 1 mean on a Maytag microwave?
Error 1 on a Maytag microwave (specifically model MMC5080AA) means the control board has detected a shorted circuit in the humidity sensor system. The humidity sensor monitors moisture levels during cooking, and a short in the sensor or its wiring triggers this fault. The microwave will display this code as a protective measure to prevent incorrect operation or component damage.
Can I fix Error 1 on my Maytag microwave myself?
The first step, allowing the oven to cool and checking the wire connection at the humidity sensor, is something a careful DIYer can handle. If the connector appears secure and undamaged, further diagnosis requires an ohmmeter to test sensor resistance, which is within the skill range of an experienced DIYer or technician. Replacing the humidity sensor is also a feasible DIY repair if the correct part is sourced, though working inside a microwave always carries risk due to high-voltage capacitors that must be properly discharged first.
Is it safe to use my Maytag microwave while Error 1 is displayed?
It is not recommended to continue using the microwave while Error 1 is active. The error indicates an electrical fault in the sensor circuit, and operating the unit in this state could produce inaccurate cooking results or potentially cause further electrical damage. The unit should be diagnosed and repaired before returning to regular use.
How much does it cost to repair Error 1 on a Maytag microwave?
If only the wire connector needs to be reseated or cleaned, there may be no parts cost involved. Humidity sensor replacement parts typically range from $15 to $60 depending on sourcing. If a professional technician is needed for diagnosis and repair, total service costs including labor can range from $80 to $200 or more depending on your location and the extent of the repair.
Will resetting my Maytag microwave clear Error 1?
Unplugging the microwave for a few minutes may temporarily clear the error code, but if the underlying short circuit in the humidity sensor or its wiring is still present, the code will return once the unit is powered and used again. A reset without addressing the root cause is not a permanent fix. The sensor connection and sensor itself need to be inspected and tested to resolve the fault.

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