Vacuum motor pulses up and down in speed repeatedly during use without an error code.

Safety first: Turn off the vacuum and remove the battery.

• Clean dust bin and cyclone: Empty the bin and thoroughly clean the cyclone assembly.
• Clean filters: Remove and clean pre-filter and HEPA filter as recommended.
• Check for small obstructions: Inspect wand and floor head for small items that could move and re-block the path.
• Switch to manual mode: If your model has auto and manual modes, test in manual mode. If pulsing stops, the auto-suction sensor may be reacting to marginal airflow; keep filters and paths very clean.