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Error code reference

Amana Microwave Error Code E12

Gas sensor short error.

Amana codesAmana microwave codes

Gas sensor short error.

First step from the service manual

Check sensor connection, wiring, or PCB.

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
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What E12 means on a Amana microwave

The E12 error code on an Amana microwave indicates a gas sensor short error. The gas sensor in a microwave-oven combination unit is responsible for detecting humidity and gases released during cooking, allowing the appliance to automatically adjust cooking times. When the control board detects an abnormally low resistance or a direct short in the gas sensor circuit, it triggers the E12 fault to prevent inaccurate cooking behavior or potential component damage.

The most likely cause of this error is a short circuit within the sensor itself, its connecting wiring harness, or at the sensor's connector on the printed circuit board (PCB). A shorted sensor will typically present with near-zero resistance across its terminals, well below the normal operating resistance range the control board expects to see. Damaged insulation on the wiring, a pinched harness, or moisture intrusion at the connector can all create a low-resistance path that mimics a sensor short.

Diagnosis begins with a physical inspection of the sensor connector and associated wiring for signs of damage, corrosion, or contact with moisture. If the wiring appears intact, the sensor itself should be tested with a multimeter to confirm whether it is shorted internally. A faulty PCB with a damaged sensor input circuit is a less common but possible cause, particularly if the sensor and wiring both test within normal parameters.

Source: manufacturer service documentation.

Common causes of E12

  1. 01

    Faulty gas sensor

    Part replacement

    The gas sensor itself may have developed an internal short circuit. Testing the sensor with a multimeter for near-zero or zero resistance across its terminals will confirm if the component has failed.

  2. 02

    Damaged wiring harness

    Part replacement

    The wiring between the gas sensor and the control board may have pinched, frayed, or melted insulation, creating a short to ground or between conductors. Visually inspect the entire harness run for damage.

  3. 03

    Loose or corroded sensor connector

    Wiring / connection

    The connector at the sensor or at the PCB may be corroded, bent, or partially dislodged, causing an unintended low-resistance contact. Reseating or cleaning the connector may resolve the error.

  4. 04

    Moisture intrusion at the connector

    Wiring / connection

    Steam or liquid contamination at the sensor connector can create a conductive path that registers as a short. Inspect the connector for moisture and allow it to dry completely before retesting.

  5. 05

    Defective PCB sensor input circuit

    Part replacement

    If the sensor and all wiring test normally, the sensor input circuit on the printed circuit board may be damaged or shorted internally. This requires PCB replacement or professional repair.

See the test procedure for each cause

Frequently asked questions about E12

What does E12 mean on a Amana microwave?
The E12 code on an Amana microwave signals a gas sensor short error. The control board has detected an abnormally low resistance in the gas sensor circuit, which indicates a short in the sensor, its wiring, or its connector. The appliance uses this sensor to monitor cooking conditions automatically, and the error prevents operation until the fault is resolved.
Can I fix the E12 error on my Amana microwave myself?
Some causes of E12 are DIY-accessible, such as reseating a loose connector, cleaning a corroded terminal, or drying out moisture at the sensor plug. If the sensor or wiring is damaged, replacing those components requires disassembling the microwave, which should only be done after unplugging the unit and allowing high-voltage capacitors to discharge. PCB-level repairs are generally best left to a qualified technician.
Is it safe to use my Amana microwave while the E12 code is showing?
It is not recommended to continue using the microwave while E12 is active. A shorted sensor circuit can lead to inaccurate cooking control and may indicate underlying wiring damage that could pose a safety risk. The appliance should be unplugged until the fault is diagnosed and repaired.
Will resetting my Amana microwave clear the E12 error?
A power reset, such as unplugging the unit for a few minutes, may temporarily clear the E12 code, but the error will return if the underlying short circuit has not been corrected. A reset alone does not repair a faulty sensor, damaged wiring, or a defective connector. Proper diagnosis of the sensor circuit is necessary for a lasting fix.
How much does it cost to repair an E12 gas sensor error on an Amana microwave?
Repair costs vary depending on the failed component. A replacement gas sensor typically costs in the range of $15 to $50 for the part alone, while a PCB replacement can range from $80 to $200 or more. Adding professional labor generally brings the total repair cost to somewhere between $100 and $300, depending on the technician and the extent of the damage.

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