Noticed that furnace blower was running continuously and no heat. Looked at thermostat and Gas Flame symbol {call for heat} was not on. Turned heat off. Inspected furnace and noticed continuously blinking LED on control module. Turned off power to furnace. Waited a few minutes then turned power back on and reset thermostat and set temperature. Observed furnace and normal sequence of Vent fan, igniter and ignition of burners and main blower operating sequence. Unit has been on for 24 hrs and has not repeated the blowing fan cold air situation again. The LED is still continuously blinking so what type of problem do I have?