Error code reference

GE Microwave Error Code SENSOR ERROR

During sensor cooking functions (Popcorn, Reheat, Beverage, Chicken/Fish, Potato, or Vegetables), the door…

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During sensor cooking functions (Popcorn, Reheat, Beverage, Chicken/Fish, Potato, or Vegetables), the door was opened before steam could be detected, or the sensor did not detect steam within the maximum allotted time.

First step from the service manual

Close the door, press STOP/CLEAR and start again. If food is undercooked after countdown, use Timed Cook to increase cooking time.

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

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What SENSOR ERROR means on a GE microwave

The SENSOR ERROR code on a GE microwave is triggered by the control board when the door is opened during a Sensor cooking cycle before the humidity sensor has detected steam rising from the food. The Sensor feature relies on a humidity sensor inside the oven cavity to measure moisture vapor. When the door is opened prematurely, the sensor never receives the steam signal it requires to calculate remaining cook time, so the control board throws this error and halts the cycle.

For homeowners, this error is not a sign of a broken microwave. It means the door was opened too early during a Sensor Cook or Sensor Reheat function. When you use a Sensor feature, the microwave waits for steam to rise from your food before it sets a countdown timer on the display. If you open the door before you see the timer counting down, the sensor never gets that steam reading and the error appears.

If the error appears even when the door is not opened prematurely, the humidity sensor itself may be failing or have a contaminated sensing surface. In persistent cases, the humidity sensor or the control board processing its signal may require inspection or replacement.

Source: manufacturer service documentation.

Common causes of SENSOR ERROR

  1. 01

    Door opened before steam detection

    Wiring / connection

    The most common cause is simply opening the microwave door during a Sensor cooking cycle before the humidity sensor detects steam and the countdown timer appears on the display. This interrupts the sensor read cycle and triggers the error immediately.

  2. 02

    Contaminated or coated humidity sensor

    Wiring / connection

    Grease, food splatter, or residue buildup on the humidity sensor can block it from detecting steam accurately, causing the control board to register no steam signal even when the door remains closed. Cleaning the interior cavity, especially around the sensor port, may resolve this.

  3. 03

    Faulty humidity sensor

    Part replacement

    If the humidity sensor has failed internally, it will not send a valid steam-detection signal to the control board regardless of cooking conditions, producing a persistent SENSOR ERROR on every Sensor cycle.

  4. 04

    Defective control board

    Part replacement

    If the control board is not correctly reading or processing the signal from the humidity sensor, it may throw a SENSOR ERROR even when the sensor itself is functioning properly. This is the least likely cause and should be diagnosed only after ruling out the sensor and contamination.

See the test procedure for each cause

Frequently asked questions about SENSOR ERROR

What does SENSOR ERROR mean on a GE microwave?
SENSOR ERROR means the oven door was opened during a Sensor cooking cycle before the humidity sensor inside the cavity detected steam from the food. The Sensor feature needs to read rising steam to calculate cook time. Opening the door before the countdown timer appears on the display interrupts this process and triggers the error.
How do I fix SENSOR ERROR on a GE microwave?
Start the Sensor Cook or Sensor Reheat cycle again and do not open the door until the display shows a countdown timer, which means steam has been detected. If the error appears on every Sensor cycle even when you keep the door closed, clean the interior of the microwave thoroughly to remove any grease or residue near the sensor port. If cleaning does not resolve it, the humidity sensor likely needs replacement.
Can I still use my GE microwave when it shows SENSOR ERROR?
Yes. The SENSOR ERROR only affects Sensor cooking functions. You can still use all standard timed cooking modes, defrost by weight or time, and other non-sensor features without issue. The error does not indicate a safety problem with the microwave itself.
How much does it cost to fix SENSOR ERROR on a GE microwave?
If the cause is simply door timing, the fix costs nothing. If the humidity sensor needs replacement, the part typically costs between $20 and $60 depending on the model, and it is accessible to a confident DIYer with basic disassembly skills. A control board replacement is more expensive, ranging from $80 to $200 or more for the part, and professional diagnosis is advisable before committing to board replacement.
Why does my GE microwave keep showing SENSOR ERROR even when I don't open the door?
A persistent SENSOR ERROR with the door closed points to a contaminated or failed humidity sensor. Wipe down the entire interior cavity, paying close attention to any vents or ports near the top of the oven cavity where the sensor is typically located. If cleaning does not clear the error, use a multimeter to test the humidity sensor for proper resistance output, or replace the sensor directly, as it is the most common failed component in this scenario.

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