Hansa Thermostat or Temperature Control Stuck Closed

Freezer overcooling; interior temperature much lower than setpoint, heavy frost on food and walls.

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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

Mechanical thermostat contacts welded closed, Shorted temperature sensor causing control to overrun, Faulty main control board ignoring sensor input, Miscalibrated thermostat knob or sensor placement

How to Fix / Troubleshooting

Safety first: Unplug the freezer before accessing the thermostat or control board.

Step-by-step checks:

  • 1. Verify with thermometer: Place a thermometer inside to confirm actual temperature vs. setpoint.
  • 2. Adjust control: Turn the thermostat or digital setting to a warmer position and monitor for several hours. If no change, suspect a control fault.
  • 3. Test mechanical thermostat: On mechanical models, access the thermostat (usually behind the control knob). Disconnect and test for continuity; it should open when turned to the warmest setting. If it remains closed, replace it.
  • 4. Sensor-based models: If using NTC sensors, test the cabinet sensor and replace if readings are out of range. If sensor is good, the main control board may be defective.
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Repair Difficulty

Medium 3/5

Required Part

Thermostat / Temperature Control
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