E5
Neff
Ambient Temperature Sensor Fault
Display shows E5 and the refrigerator does not cool properly or cycles erratically.
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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 ambient NTC sensor, Sensor dislodged from housing, Damaged wiring between sensor and control board, Faulty main control board input
How to Fix / Troubleshooting
Safety: Disconnect the appliance from mains before accessing any external sensor housings.
Procedure:
- Locate ambient sensor: On many Neff models, the ambient sensor is behind a small grille on the top or rear of the cabinet, or integrated near the condenser area.
- Inspect housing and wiring: Check for physical damage, insect ingress, or broken wires.
- Test sensor: Remove or disconnect the sensor and measure resistance at current room temperature. Compare to the NTC curve for your model. Replace if open, shorted, or clearly out of range.
- Check harness continuity: Verify continuity from the sensor connector to the main PCB. Repair any breaks or corroded pins.
- Replace sensor: Fit a genuine Neff ambient NTC sensor, secure it in the original location, and ensure the grille is not blocked.
- Control board check: If a known-good sensor and wiring are present but E5 remains, the main PCB may be defective and should be evaluated by a professional.
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Repair Difficulty
Medium
3/5
Required Part
Ambient NTC Temperature Sensor
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