Freezer temperature alarm with F12, freezer not reaching setpoint despite long run times

Safety first: Disconnect power before accessing rear components.

Steps:

• 1. Check door usage: Frequent or prolonged door openings can trigger high-temperature alarms. Reduce door openings and monitor.
• 2. Inspect freezer door gasket: Look for gaps or damage that allow warm air ingress and frost buildup.
• 3. Confirm condenser fan operation: With the unit powered (for testing), verify that the condenser fan at the rear runs when the compressor is on. If not, see fan-related faults.
• 4. Clean condenser coils: Remove dust and lint to improve heat rejection.
• 5. Check frost pattern: Remove the freezer’s rear interior panel and inspect the evaporator. A partial frost pattern suggests sealed system issues.
• 6. If airflow and seals are good but F12 persists: A sealed system fault is likely. Only a certified V-ZUG service technician should perform leak detection, evacuation, and recharging.

Warning: Sealed system repairs involve high pressure and refrigerants; do not attempt DIY.