Caple Thermostat or Temperature Sensor Failure (Stuck Cooling)

Freezer excessively cold; ice forming on interior walls and food rock‑hard even at higher setpoints

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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

Cabinet NTC sensor reading too warm (out of calibration), Mechanical thermostat contacts stuck closed (on older Caple models), Compressor relay on PCB welded closed, Shorted sensor wiring

How to Fix / Troubleshooting

Safety: Unplug the freezer before accessing the control housing or sensor.

Steps to diagnose and correct:

  • 1. Confirm settings: Ensure the set temperature is not at the coldest setting and fast‑freeze is off.
  • 2. Check compressor duty: If the compressor runs almost continuously with little off time, suspect control issues.
  • 3. Inspect and test sensor/thermostat: Access the control housing (usually inside the cabinet or at the top). For NTC sensors, measure resistance and compare to expected values. For mechanical thermostats, test continuity; it should open when the knob is turned to OFF.
  • 4. Replace faulty sensor or thermostat: Fit the correct Caple replacement part, routing wires as originally.
  • 5. PCB relay check: If the sensor/thermostat is good but the compressor still runs constantly, the compressor relay on the PCB may be stuck closed. Replace the PCB.

Note: After repair, monitor temperature with a separate thermometer to confirm stable operation.

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Repair Difficulty

Medium 3/5

Required Part

Thermostat / Cabinet NTC Temperature Sensor
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