E20
Wolf Humidity / Steam Sensor Failure

Microwave shows E20 and sensor cooking functions do not operate correctly.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed humidity sensor, Sensor covered with residue, Loose sensor wiring, Control board sensor input failure

How to Fix / Troubleshooting

Safety first: Unplug the microwave before cleaning the cavity.

Cleaning the sensor area:

  • The humidity sensor is typically located on the upper cavity wall or ceiling behind a small grille.
  • Clean the interior thoroughly, especially near the sensor opening, using mild detergent and water. Remove grease and food splatter.
  • Dry completely and allow the unit to air out for at least 30 minutes.

Testing:

  • Restore power and test a sensor cook program with a recommended food item.

If E20 persists or sensor modes fail:

  • The humidity sensor or its wiring is likely defective and must be replaced.
  • Schedule service to replace the humidity sensor and verify control board operation.
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Repair Difficulty

Hard 4/5

Required Part

Humidity Sensor
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