Why m'y Dyson stops when using Motorhead?

Hello,

I have a problem with m'y Dyson v8

It works well without motorised brush, but if i connect motorised brush, it doesn't work at all, no suction, no rotation.

I only have the three LEDs on thé battery turned on.

If remove the brush, it doesn't works anymore. I have to plug and unplug the charger for one second to make it work again (without motorised brush)

Thanks