CF
SMEG Communication Failure Between UI and Main Control Board

Wine cooler displays CF or a communication fault code and may not respond to control inputs.

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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

Damaged or loose communication harness, Faulty user interface PCB, Faulty main control PCB, Power surge or static discharge damage

How to Fix / Troubleshooting

Safety: Unplug the appliance before accessing any electronic boards or wiring.

Steps to address CF:

  • Power reset: Disconnect power for 10–15 minutes, then reconnect. If CF reappears immediately, proceed with hardware checks.
  • Inspect harness: Access the area behind the control panel and locate the communication cable between the UI and main PCB. Check for pinched, cut, or burnt wires and reseat all connectors.
  • Check for moisture: Look for signs of condensation or liquid spills around the control panel. Dry thoroughly if present.
  • Swap boards if necessary: If available, replace the UI PCB first, as it is often easier and cheaper. If CF persists, replace the main control PCB.

Note: Always match replacement boards to the exact SMEG model and version; incompatible boards may not communicate correctly.

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Repair Difficulty

Hard 4/5

Required Part

Communication Harness
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