Gram Overcooling / Thermostat or Sensor Out of Calibration

Freezer interior is too cold; items near the back are excessively frozen or frosted; temperature does not respond to control changes.

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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

Stuck-closed mechanical thermostat, Shorted cabinet temperature sensor (NTC), Faulty main control PCB not cycling compressor, Mis-set or damaged temperature control knob

How to Fix / Troubleshooting

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

Step-by-step checks:

  • 1. Adjust setting: Turn the temperature control to a warmer setting and monitor for 12–24 hours. If no change, suspect a control fault.
  • 2. Mechanical thermostat models: Remove the thermostat cover and test for continuity. If it remains closed (continuous) regardless of knob position, replace the thermostat.
  • 3. Electronic sensor models: Access the cabinet NTC sensor and test its resistance. A shorted sensor (very low resistance) can cause overcooling. Replace if out of spec.
  • 4. PCB evaluation: If thermostat/sensor are good but the compressor never cycles off, the main control PCB may be stuck driving the compressor.

When to call a technician: If PCB replacement is required or you are unsure how to test the thermostat/sensor, contact a Gram service technician.

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Repair Difficulty

Medium 3/5

Required Part

Mechanical Thermostat or Cabinet NTC Sensor
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