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Why does my fan continue to run no matter the settings on Lennox L7742U thermostat

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Remove the screen section of the tstat, as to get to the wiring and batteries. If the fan stops then, then it's the tstat. Make sure your fan setting is on auto, not on.

Posted on May 11, 2017

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If you turn the thermostat OFF, does the fan STILL run?

Posted on May 11, 2017

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