The sensors in this furnace turned it off and turned the blower to purge. This requires a technician. It is no easy fix. The roll out here tripped. This is not a bad switch. It saved the furnace. The flame was not going into the exchanger but was still touching the flame sensor. This is bad. The technician (me) cleared the tube. Cleaned the sensor and cleaned pressure switch. After this a reset on the roll out was done. This furnace in Locust Grove is working again. 
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