Don't panic; that rhythmic pulsing rarely means your expensive vacuum motor is dying.
The motor pulses because the intelligent airflow sensors detect a blockage or restricted airflow.
The pulsing is a built-in safety feature designed to prevent your motor from overheating completely.
A clogged or damp filter is the leading cause of the Dyson V15 pulsing symptom.
Inspect the cyclone shroud and wand for trapped debris to restore full suction power immediately.
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