Sharp Sensor Calibration / Control Logic Issue

Refrigerator temperature fluctuates widely, sometimes freezing items then warming.

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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

Aging or drifting thermistors, Poor sensor placement or contact, Intermittent wiring connections, Faulty control algorithm on PCB

How to Fix / Troubleshooting

Safety: Unplug the refrigerator before accessing sensors or the control board.

Steps:

  • Verify with thermometer: Place an accurate thermometer in both compartments to confirm actual temperatures versus setpoints.
  • Inspect thermistors: Check refrigerator and freezer sensors for secure mounting and good contact with the liner or evaporator.
  • Replace suspect sensors: If readings are erratic or out of spec, install Sharp-compatible thermistors.
  • Check wiring: Inspect harnesses for intermittent connections or damage.

If fluctuations continue after sensor and wiring replacement, the main control board may require replacement.

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Repair Difficulty

Medium 3/5

Required Part

Refrigerator Compartment Thermistor
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