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when i turn the switch in my unit always keep the same speed in low, high, and mediun always the same speed. What going on
 

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Perhaps your fan is only single speed. Try posting more info: make, model, etc. I've had service calls where the customer complains that their air conditioning doesn't work when they set their thermostat to cool. The problem was that they didn't have AC at all, but thought they did because the thermostat had a heat and cool mode.
 

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Either only a single speed motor. Or only wired to use one speed no matter what speed you select on the stat plate.
 
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