Defective switch on Ikea UDDEN range hood HW 320

...in the meantime I have found the cause of the blocked switch: it has a locking screw next to the lever that is stuck open/closed in the middle of a logo... you have to unscrew it with the supplied special star screwdriver bit, switch the flap, and tighten it again. If you don't do this, the flap will always automatically switch back to exhaust. But someone could have explained that to you. However, the suction power has not increased. At least now we have the choice whether to let the fumes blow into the hood housing or onto the ceiling, well...

@maninblue: thanks for your explanation. That would explain the question about the switch, but still not the poor exhaust values...

Thank you for the response, I will try it out this evening.