E18
Summit
Humidity / Steam Sensor Fault
Microwave shows E18 and the sensor cooking functions do not work properly
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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 port blocked by grease or debris, Loose sensor wiring, Control board sensor circuit failure
How to Fix / Troubleshooting
Safety: Unplug the microwave before internal inspection.
User-level cleaning:
- Clean the interior of the cavity thoroughly, especially around any sensor cover or vent area on the top or side wall.
- Avoid covering the sensor area with plastic wrap or large containers during sensor cook cycles.
Technical steps:
- Locate the humidity/steam sensor behind the cavity wall.
- Inspect the sensor and its wiring harness for damage or disconnection.
- Test the sensor per Summit specifications; replace if out of range.
- If the sensor is good, the control board sensor input may be defective.
After replacing the sensor, test several sensor cook programs to confirm proper operation.
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Repair Difficulty
Hard
4/5
Required Part
Humidity Sensor
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