Milwaukee
Speed Selector or Control PCB Fault
Vacuum runs only at one speed even though it has multiple speed settings.
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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
Defective speed selector switch, Broken wiring between selector and PCB, Failed MOSFET or driver on control PCB, Corroded selector contacts
How to Fix / Troubleshooting
Safety first: Remove the battery before accessing switches or electronics.
- 1. Operate selector: Move the speed selector through all positions several times to clear minor oxidation. Reinstall battery and test.
- 2. Inspect externally: Check for physical damage to the selector knob or slider.
- 3. Open housing (if out of warranty): Access the selector switch and verify that its connector is firmly seated on the control PCB.
- 4. Test switch: Use a multimeter to confirm that the selector changes resistance or continuity between positions. Replace if it does not.
- 5. Replace control PCB: If the switch tests good but speeds do not change, the control PCB is likely faulty and should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Speed Selector Switch / Control PCB
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