We (a charity) got given one of these. This seems to have **two** switches.
I pushed the visible switch, a green pilot lights, motor doesnt run. There is
a row of buttons; end one labelled "reset". when I push that the motor runs.
There are some other buttons; AFAIK none of these does anything. There is
a row of lights; I think they are to show how strongly it is sucking. When it is
running they are all on & there is no visible way to make it suck more gently.
Please is this normal? Thank you.