F5
Medisana
Fan Speed / Airflow Sensor Fault
Humidifier shows F5; display may indicate fan or airflow error.
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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
Fan motor not starting, Blocked fan blades, Defective fan speed feedback sensor, Loose fan connector on PCB
How to Fix / Troubleshooting
Safety: Disconnect from mains before working near the fan.
- Visual inspection: Remove the cover and check the fan wheel for dust buildup or foreign objects. Clean thoroughly.
- Spin test: Rotate the fan by hand. If it is stiff or noisy, the fan motor bearings may be worn and the motor should be replaced.
- Connector check: Ensure the fan motor plug is fully seated on the PCB and that no wires are loose.
- Test operation: Reassemble partially, plug in, and briefly power on to see if the fan starts. If it does not, replace the fan motor assembly with a Medisana-compatible part.
- Feedback sensor: Some DC fans have a tachometer wire. If the fan spins but F5 still appears, the feedback signal or PCB input may be faulty, requiring fan or PCB replacement.
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Repair Difficulty
Medium
3/5
Required Part
Humidifier Fan Motor
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