Hi there Buzz... The resistor pack only supplies the current for the lower speed positions of the control. If you can hear the fan working at all the positions but there is no air, I would bet on the pollen filter being blocked up. It is 'in circuit' the whole time and can get very clogged up after about 18 months of normal use. New ones are quite cheap to buy on eBay but can be a bit of a fiddle to fit... Cheers... Robin
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