Have a Lenox Heat Whisperer when the burner stops in the furnace the fan continues even though the fan is set on auto & it does not stop running unless the power is shut off.
First follow the thermostat lines into the furnace and remove the thermostat line connected to the "G" to see if the problem stops. If it does, you have a stat, stat connections or stat circuit problem.
If not you could try tapping the fan relay to see if it releases.
Usually this means that you will need a new blower board.
check to see if there are any safety roll out switchs that may have opened i think some models have that feature....ben sr
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