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number of things can cause turn tstat from auto to on to rule out power to unit, transfomer and motor if it dosent u have voltage problem or bad capacitor or fan motor

You may want to try askarepairtech.com. They can diagnose the problem by phone and if you are handy, you can replace the part yourself. If not, they can do it.

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Q: Why doesn't the furnace blower turn on?
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