Freezer shows E8 and may not cool properly; compressor may not run even though the display is on.

Safety warning: The control module operates at mains voltage. Only open the control housing with the appliance unplugged. If you are not experienced with electronics, contact a professional.

Procedure:

• 1. Verify supply voltage: Confirm the wall outlet provides correct voltage and that the freezer power cord and plug are undamaged.
• 2. Listen for relay click: When the freezer calls for cooling, you should hear a click from the control module area. No click may indicate a failed relay or control logic.
• 3. Access the control module: Remove the top or rear control cover (depending on model) to expose the PCB.
• 4. Visual inspection: Look for burnt or cracked relay, darkened PCB around the relay, or broken solder joints. Check the compressor output connector for heat damage.
• 5. Basic repair options: On many Neff units, the relay is not intended to be user-serviceable; the entire control module is replaced. If obvious damage is present, order the correct Neff control module by model and E-number.
• 6. Install replacement module: Transfer connectors one by one from the old board to the new one to avoid miswiring. Secure the board in its housing and reassemble.
• 7. Professional help: If you are not comfortable working with mains-voltage electronics, have an authorized Neff technician diagnose and replace the module.