Festool Relay or Electronic Switching Noise

Vacuum emits unusual clicking or chirping sounds from the electronics area when starting or stopping

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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

Worn relay contacts on control board, Loose relay or component, High inrush current stressing components

How to Fix / Troubleshooting

Safety first: Remove the battery before opening the housing.

  • 1. Identify source: Open the housing and carefully listen (with battery briefly installed) to locate the source of the clicking. Do not touch live components.
  • 2. Inspect control board: Look for loose relays or components on the control PCB. Gently press them to ensure they are seated.
  • 3. Check for arcing signs: Burn marks near relay contacts indicate wear. The control board should be replaced.
  • 4. Service if necessary: Occasional soft clicks can be normal, but loud or erratic clicking accompanied by malfunction requires control board replacement by Festool service.
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Repair Difficulty

Hard 4/5

Required Part

Control Electronics Module
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