F3
Black+Decker
Motor Speed Feedback / Hall Sensor Fault
Vacuum shows 'F3', runs erratically with speed surging up and down
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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
Faulty motor speed sensor, Damaged wiring between motor and PCB, Failing motor commutator, PCB speed control failure
How to Fix / Troubleshooting
Safety first: Remove the battery and do not continue to run the vacuum if the motor surges or makes unusual noises.
- Check for overload: Clean filters, bin, and brush roll to ensure the motor is not being overloaded.
- Test on low power: After cleaning, reinstall the battery and test on the lowest speed. If surging continues, stop use.
- Listen for motor noise: Grinding, squealing, or sparking sounds indicate internal motor damage.
- Professional diagnosis: Speed feedback and control issues require testing with a multimeter and access to the motor wiring. Have the motor and main PCB tested and replaced as needed.
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Repair Difficulty
Professional Required
5/5
Required Part
Motor Assembly / Main Control PCB
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