Freezer displays F19 and may not maintain stable temperature; compressor cycles abnormally

Safety first: Disconnect mains power. Inverter modules handle high voltages and should be serviced with caution.

Steps:

• 1. Listen for compressor behavior: On inverter models, the compressor should run smoothly at varying speeds. Buzzing or no operation with F19 suggests inverter issues.
• 2. Inspect inverter module: Located near the compressor, check for burn marks, cracked casing, or loose connectors.
• 3. Check wiring: Ensure all power and communication cables between the main PCB and inverter are secure.
• 4. Professional diagnosis: Testing inverter outputs and compressor windings under load requires specialized tools. Typically, the inverter module is replaced first; if the fault persists, the compressor may be defective.

Warning: Due to high voltages and refrigerant system involvement, F19 faults are best handled by an authorized Miele refrigeration technician.