F4
Sencor
Overcurrent Protection on Main Motor
Vacuum displays F4 and shuts down when switching to MAX or TURBO mode.
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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
Partially blocked airflow causing high load, Worn motor bearings in Sencor motor unit, Shorted windings in main motor, Faulty current sensing circuit on PCB
How to Fix / Troubleshooting
Safety first: Remove the battery before cleaning or disassembling.
- Check for blockages: Empty the dust bin, clean all filters, and inspect the wand and nozzle for obstructions. Even partial blockages can cause high current draw on MAX.
- Test on lower power: Run the vacuum on ECO or normal mode. If it runs normally but fails only on MAX, the motor may be near end-of-life.
- Listen for noise: Grinding or high-pitched squealing from the motor area indicates worn bearings and increased load.
- Replace motor assembly: If F4 persists with clear airflow and clean filters, replace the main motor assembly with an original Sencor part. If a new motor still triggers F4, the control PCB current sensor may be faulty and needs replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Suction Motor Assembly
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