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Error code reference

Maytag Microwave Error Code E12

Gas sensor short error.

Maytag codesMaytag microwave codes

Gas sensor short error.

First step from the service manual

Check if sensor is unplugged; inspect wiring and PCB assembly.

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

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What E12 means on a Maytag microwave

E12 on a Maytag microwave indicates the control board has detected a short circuit condition in the gas sensor circuit. The PCB assembly continuously monitors the gas sensor's electrical signal; when it reads a value outside the expected range due to a short, it throws E12 and halts normal operation. The fault can originate at the sensor itself, the wiring harness connecting the sensor to the board, or the PCB assembly if the short is internal to the board.

For homeowners, this error means the microwave's built-in gas sensor has an electrical problem. This sensor monitors gas levels in the cavity during cooking cycles. A 'short' means two points in the circuit are making unintended contact, sending an abnormal signal to the control board. The board then stops the appliance to prevent potentially unsafe operation. The most common starting points are a loose or disconnected sensor connector, damaged wiring, or a failed sensor or control board that needs replacement.

Source: manufacturer service documentation.

Common causes of E12

  1. 01

    Disconnected or loose gas sensor connector

    Wiring / connection

    The sensor connector may have vibrated loose from the PCB or sensor terminal, creating an open or short condition that the control board reads as E12. Reseating the connector fully resolves this without any parts replacement.

  2. 02

    Damaged or shorted wiring harness to gas sensor

    Part replacement

    Wiring between the gas sensor and the PCB can chafe against the microwave chassis or get pinched during reassembly, causing insulation to wear through and wires to short against each other or ground. Visually inspect the full harness run for burnt, melted, or frayed sections.

  3. 03

    Failed gas sensor

    Part replacement

    The gas sensor itself can develop an internal short, producing an out-of-range resistance or voltage signal that triggers E12. A multimeter check of the sensor's resistance against the specification in the service manual will confirm whether the sensor has failed.

  4. 04

    Faulty PCB assembly

    Part replacement

    If the sensor and all wiring check out correctly, the PCB assembly may have a shorted component on the sensor input circuit. This is the least likely cause but should be evaluated after ruling out the sensor and harness.

See the test procedure for each cause

Frequently asked questions about E12

What does the E12 error code mean on a Maytag microwave?
E12 means the control board detected a short circuit in the gas sensor circuit. The board monitors the sensor's electrical signal during operation, and when it falls outside the acceptable range due to a short, the unit displays E12 and stops running. The fault can be in the sensor connector, the wiring harness, the sensor itself, or in rare cases the PCB assembly.
How do I fix E12 on a Maytag microwave?
Start by unplugging the microwave, then remove the outer casing and locate the gas sensor and its wiring harness. Check that the connector is fully seated at both the sensor and the PCB. Inspect the harness for any pinched, chafed, or burnt wiring. If the connector and wiring look intact, use a multimeter to test the sensor's resistance and compare it to the service manual spec. Replace the sensor if it reads a short, or replace the PCB if the sensor and wiring are both good.
Is it safe to use my Maytag microwave while E12 is displayed?
No. When E12 is active, the microwave has shut down operation because it cannot confirm the gas sensor circuit is functioning correctly. Running the appliance in this state bypasses a safety monitoring function. Do not attempt to use the microwave until the fault is diagnosed and repaired.
How much does it cost to fix the E12 error code on a Maytag microwave?
If the fix is a reseated connector, there is no parts cost and only your time. A replacement gas sensor typically runs $20 to $60 depending on the model. A replacement PCB assembly is the most expensive repair, often ranging from $80 to $200 or more for the part alone. If you hire a technician, expect a service call fee of $75 to $150 on top of parts, which can make PCB replacement approach or exceed the cost of a new mid-range microwave.
Can a loose wire cause E12 on a Maytag microwave?
Yes, and this is the first thing to check. A disconnected or partially seated connector at the gas sensor creates an abnormal circuit condition that the control board interprets as a short, triggering E12. Before ordering any parts, unplug the unit, access the sensor wiring, and firmly reseat all connectors along the harness. This costs nothing and resolves the error in some cases.

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