E18
Numatic Motor Speed Control / Tachometer Fault

Vacuum runs but speed fluctuates up and down on its own, with occasional error flashes

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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 (tachometer), Loose motor connector, Failing control PCB, Interference from damaged wiring

How to Fix / Troubleshooting

Safety first: Remove the battery before opening the housing.

  • Check for blockages first: Ensure airflow is clear and filters are clean; airflow issues can sometimes mimic speed changes.
  • Inspect motor wiring: If you open the body, verify that the motor connector is fully seated and wires are not pinched.
  • Observe behavior: With the vacuum reassembled, note if speed changes occur when moving the handle or tapping the body lightly. If so, there may be a loose connection.

Persistent speed fluctuation usually indicates a failing motor or control PCB and should be addressed by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Motor Assembly
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