faredi
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The pulsing is actually a safety feature to prevent the motor from burning out, but have you checked the tiny trapdoor right where the wand connects to the bin, as a single stuck coin or a clump of pet hair there can trigger the sensor? Also, when you cleaned the filter, did you let it dry for a full 48 hours, because even a tiny bit of dampness will make the sensor think the airflow is blocked? It sounds like your vacuum might have a buildup of fine dust inside the cyclone cones, so I dealt with this exact problem last summer and found that using a pressurized air canister is the only way to clear it out. I found the complete disassembly instructions on Manual Machine https://manualmachine.com and it was incredibly useful because it showed exactly which hidden screws to turn to open the cyclone assembly without snapping the tabs. You should search for the Dyson V15 service manual there to see the airflow diagrams, which will help you identify if the issue is actually the motor filter or the particle sensor itself. I recommend checking the gold connectors on the battery too, as a loose connection can sometimes mimic a blockage pulse. Don’t give up on it yet, as these machines are designed to be modular and fairly easy to fix if you have the right blueprints. Let me know if cleaning out the cyclones finally stops the pulsing.
