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I have a Rudd Silhouette II Gas Furnace. Model # RCBA-3765AS17. The blower will not shut off and runs 24/7. Even if I turn the thermostat off, the blower continues to run. The compressors outside still cycles on and off like normal. I have tried replacing the thermostat and nothing changed. The only way to get the blower to shut off is to turn the breaker off at the power panel.

What should I check?
 

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most like the relay at board control is stuck. you can knock the relay, maybe you're be able to release it.
 

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Could be a stuck/bad high limit. This is a common thing with furnaces that are installed in an attic.
 
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