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When on high speed the motor is running at it's normal speed.
When a slower speed is selected (mostly) there is external circuitry to reduce the current to the motor so it runs at a slower speed, though in some cases the motor could be specially wound for multiple speeds. The latter way is unlikely to be found in a cooker hood or extractor fan or other small appliance.
The fault with your appliance could be the switch or the current reducing circitry. It is only by delving inside and testing that the fault could be found.
Firstly operate extractor normally,hold a piece of A4 paper on the underside of fan and see how it holds it on the different speeds.Then if you can remove the charcoal filters then operate as before and compare the difference between the suction,this should tell you if it is the charcoal filters or a blockage in the pipe.
Not easy. Briefly, in addition to the screws you mention, the cooker side panels need to be removed to give access to removal of the control panel side clamps. Then the indicator lamps have to be disconnected, and timer etc. buttons have to be pulled out to allow removal of the the control panel. Then the main control unit (timer etc.) needs to be unscrewed from behind the control panel.
Replacement is reversal of above.