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You say the blower won't turn off? Try disconnecting all the thermostat wires from the board and see what happens.
Take ALL thermostat wires off and see what happens.
If blower still runs with thermostat wires disconnected, then connect them back. Check your board. Do you have a wire jumpered across in the CONTINUOUS FAN mode as shown here? If so, remove that wire and tape. I have to leave for about 45 minutes, but will check back when I return.
What'd you find?
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