FAN/HEATER HELP!!

My fan/heater control has all of a sudden decided to stop working, It only works in the full fan speed, Hot/cold air still comes out and aircon works fine but the fan speed only works in full position. When you turn the knob to the low and medium fan speed setting nothing happens!!!!
Can anyone tell me what is wrong with it and how can i fix this problem.

Any help appreciated, Thanks.
 
heater resister card, passenger footwell, underneath the dash,

search its very common
 
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