What to do if the sander does not start after using it with water?

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Your RO 150 FEQ sander does not start after using it with water because the water has damaged its electrical components. The manual clearly states that this machine must not be wet or used in a humid environment - it should only be used for dry sanding.

Diagnosis: Water has infiltrated the motor (720 W) and electrical circuits, causing a short circuit or damaging class II components (double insulation).

What you can do:

Do not restart: do not attempt to force a start, this would worsen the internal damage
Let it dry completely: place the machine in a warm, dry place for at least 3 to 4 days before any new attempt
Have it repaired by an authorized workshop: according to the manual, any maintenance requiring the opening of the cover must be carried out by an authorized workshop. A certified Festool repairer will be able to accurately diagnose the damaged components and replace them if necessary. Contact Festool at www.festool.com to locate an authorized workshop

Golden rule: the RO 150 FEQ is designed exclusively for dry sanding and polishing of wood, plastic, metal, chipboard, paint/lacquer, and filler. Never use it with water or in a humid environment.

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