Blomberg Overcooling / Thermostat Stuck On

Freezer interior temperature is too low; food is excessively hard or ice cream is rock solid even at moderate settings.

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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

Shorted temperature sensor, Main control board not cycling compressor off, Thermostat set too low or faulty, Super-freeze mode stuck on

How to Fix / Troubleshooting

Safety first: Unplug the freezer before accessing sensors or control boards.

Check settings:

  • Verify that super-freeze mode is off.
  • Adjust the temperature setting to a warmer value and monitor for changes.

Sensor and control checks:

  • Test the cabinet NTC sensor for correct resistance at known temperatures.
  • If the sensor reads much lower resistance than expected (indicating a falsely low temperature), replace it.
  • If the sensor is good but the compressor runs almost continuously regardless of setpoint, suspect the main control board.

Corrective actions:

  • Replace faulty sensor: Install a new Blomberg-compatible NTC if the original is out of spec.
  • Replace main PCB: If the board does not cycle the compressor off appropriately, replace it.

Test: Monitor temperature with a thermometer over 24 hours to ensure it stabilizes at the desired level.

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Repair Difficulty

Medium 3/5

Required Part

Cabinet NTC Temperature Sensor
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