Milwaukee Unstable Motor Control or Power Supply

Vacuum motor speed surges up and down without changing the trigger or speed setting.

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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

Loose battery connection, Failing control PCB, Intermittent motor brushes (on brushed models), Faulty speed control potentiometer

How to Fix / Troubleshooting

Safety first: Remove the battery before internal inspection.

  • 1. Check battery fit: Ensure the battery is fully seated and latched. Clean contacts if necessary.
  • 2. Test with another battery: Rule out a battery issue by trying a different M18 pack.
  • 3. Inspect brushes (if applicable): On brushed motors, check brush length and spring tension. Replace worn brushes if serviceable.
  • 4. Inspect control PCB: Look for burnt components or loose connectors on the PCB.
  • 5. Replace faulty parts: Replace the control PCB or motor assembly if surging persists under stable power conditions.
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Repair Difficulty

Hard 4/5

Required Part

Control PCB / Motor Assembly
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