Toshiba Temperature Control Overshoot / Sensor Misreading

Freezer interior too cold, food excessively hard or ice cream rock solid even at higher 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 cabinet thermistor, Thermistor not properly attached to liner, Main PCB calibration fault, Stuck relay driving compressor

How to Fix / Troubleshooting

Safety: Unplug the freezer before removing panels or testing sensors.

Steps:

  • 1. Verify settings: Confirm the temperature is not set to the coldest level. Adjust to a warmer setting and monitor for 24 hours.
  • 2. Check cabinet sensor: Locate and test the cabinet thermistor (see E1). A shorted sensor will read very low resistance and cause overcooling.
  • 3. Inspect sensor mounting: Ensure the sensor is in proper contact with the liner or evaporator cover, not touching the evaporator directly unless designed to.
  • 4. PCB relay: If the compressor runs almost constantly despite correct sensor readings, the compressor relay on the main PCB may be stuck closed. Replace the main control PCB.
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Repair Difficulty

Medium 3/5

Required Part

Cabinet Thermistor Sensor
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