EC31
Sub-Zero Zone Sensor or Zone Control Fault

Wine cooler displays EC31 and may show erratic humidity or temperature control in a specific zone.

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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

Failed zone thermistor, Loose sensor connection at zone board, Faulty zone control board, Damaged wiring harness within door or cabinet

How to Fix / Troubleshooting

Safety first: Disconnect power before removing interior panels or accessing boards.

Step 1 – Confirm affected zone

  • Identify which zone is reporting EC31 or behaving erratically.
  • Compare displayed temperature to an independent thermometer in that zone.

Step 2 – Inspect zone sensor

  • Locate the zone’s thermistor behind a small cover on the wall or ceiling of that compartment.
  • Inspect and reseat the sensor connector.
  • Replace the sensor if damaged or if readings are clearly inaccurate.

Step 3 – Zone board check

  • If a new sensor does not resolve EC31, the zone control board may be faulty.
  • Board replacement and configuration are best handled by a professional.
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Repair Difficulty

Hard 4/5

Required Part

Zone Thermistor
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