Proline Overcooling Due to Stuck Thermostat or Sensor Fault

Freezer is too cold; items near the back are rock solid and some items may crack or split.

Advertisements

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.

Advertisements

Possible Causes

Mechanical thermostat contacts stuck closed, Shorted cabinet NTC sensor reading too warm, Control PCB relay stuck on, Incorrect temperature setting

How to Fix / Troubleshooting

Safety first: Avoid direct skin contact with extremely cold metal surfaces.

Steps to correct overcooling:

  • 1. Check set temperature: Ensure the control is not set to the coldest position unnecessarily. Adjust to a moderate setting and monitor.
  • 2. Mechanical thermostat: If turning the knob to a warmer setting does not reduce compressor run time, the thermostat may be stuck closed and should be replaced.
  • 3. Electronic control: Test the cabinet NTC sensor; a shorted sensor will make the control think the freezer is warm, causing continuous cooling. Replace if readings are abnormal.
  • 4. Control PCB: If the compressor relay is welded closed, the compressor will run constantly. In this case, the main control PCB must be replaced by a technician.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Thermostat / Cabinet NTC Sensor
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements