Neff Overcooling / Thermostat Control Failure

Freezer runs continuously and overfreezes food, forming excessive ice on items.

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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

Faulty freezer temperature sensor (NTC) reading too warm, Stuck compressor relay on main control module, Miscalibrated control electronics, Shorted sensor wiring

How to Fix / Troubleshooting

Safety: Disconnect power before testing sensors or accessing the control board.

Steps:

  • 1. Verify temperature: Use a thermometer to confirm actual temperature. If it is much lower than the setpoint, control is faulty.
  • 2. Check sensor: Access the freezer NTC sensor and test its resistance. Replace if readings are out of specification.
  • 3. Inspect control relay: On the main control module, check if the compressor relay contacts are welded closed (compressor runs even when the board should be off). If so, replace the module.
  • 4. Wiring check: Inspect sensor wiring for shorts that could cause the control to think the freezer is warm.
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Repair Difficulty

Hard 4/5

Required Part

Freezer NTC Temperature Sensor
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