SMEG Erratic Temperature Control / Sensor Intermittency

Temperature fluctuates widely; food sometimes freezes then warms in the same compartment.

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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

Loose or intermittent NTC sensor connection, Damaged wiring harness, Failing main PCB, Poor air circulation due to overloading

How to Fix / Troubleshooting

Safety first: Unplug the appliance before accessing sensors or wiring.

  • Step 1 – Check loading and vents: Avoid blocking air vents with food and leave space between items for air circulation.
  • Step 2 – Inspect sensor connectors: Locate compartment sensors and ensure their connectors are tight and corrosion-free.
  • Step 3 – Check harness: Look for pinched or damaged wires, especially where they pass through cabinet walls.
  • Step 4 – Replace suspect sensor: If wiggling the harness changes operation, replace the affected NTC sensor and repair any damaged wiring.
  • Step 5 – PCB replacement: If fluctuations persist with good sensors and wiring, the main PCB may need replacement by a technician.
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Repair Difficulty

Hard 4/5

Required Part

Temperature Sensor Harness
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