F9
Bauknecht
Refrigerant System / Low Cooling Capacity Fault
Display shows F9, high temperature alarm active, compressor runs but freezer does not cool properly
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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
Refrigerant leak in evaporator or piping, Partially blocked capillary tube, Inefficient compressor, Severely clogged condenser coil reducing heat rejection
How to Fix / Troubleshooting
Safety: Unplug the freezer before cleaning or inspecting the rear components. Refrigerant work must only be done by certified technicians.
- Clean condenser: Pull the freezer away from the wall. Vacuum and brush the condenser coil thoroughly to restore airflow.
- Check door sealing: Inspect the door gasket for gaps or tears that could cause warm air ingress and overload the system.
- Monitor compressor and temperatures: After cleaning, run the freezer for several hours. If the compressor runs continuously and the evaporator only partially frosts or stays warm, there may be a sealed-system issue.
- Look for oil stains: Oil spots on tubing or around joints can indicate a refrigerant leak.
- Do not attempt DIY refrigerant repair: If a leak or internal blockage is suspected, contact a qualified refrigeration technician. They can pressure-test, repair leaks, evacuate, and recharge the system according to Bauknecht specifications.
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Repair Difficulty
Professional Required
5/5
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