Hilti Motor Overheating / Electrical Insulation Breakdown

Strong burning smell from vacuum during or after use

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.

Possible Causes

Overloaded motor due to blockage, Severely clogged filter, Failing motor windings, Shorted turns in armature or stator

How to Fix / Troubleshooting

Safety first: Remove the battery immediately and move the vacuum to a non-flammable area. Do not continue using the tool.

Inspect for blockages: Check hose, nozzle, and filter for obstructions and clean or replace filters.
Allow to cool: Let the vacuum cool completely before any further testing.
Test briefly: After clearing blockages and cooling, run the vacuum for a few seconds. If the burning smell returns quickly or the motor sounds abnormal, stop use.
Service required: The motor windings may be damaged and should be replaced by a technician.

Repair Difficulty

Hard 4/5

Required Part

Motor Assembly

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