Strong burning smell during use, sometimes with smoke from vents

Safety first: Immediately switch off and unplug the machine. Do not continue to operate until the cause is found.

• Check for blockages: Ensure suction paths and vents are clear to prevent motor overheating.
• Inspect belts: Remove covers and check drive belts for glazing or burning. Replace any belt that smells burnt or shows melted rubber.
• Examine wiring: Look for melted insulation, discolored connectors, or scorch marks. Repair or replace damaged wiring harnesses.
• Assess motors: If a motor emits smoke or a strong burnt odor, replace the affected Nilfisk motor assembly rather than attempting repair.