Hello, Its cold here in Illinois and my heat keeps going off. i have a coleman evcon furnace model bgm07516ax and it runs for a while then after it reaches the termostat temperature it shuts off and will not come on and the led blinks once indicating ignition override according to the code. Now I replaced the filter and the batteries in my hunter digital thermostat. When I flip the thermostst switch off and then back on again the furnace starts and heats fine until the next time it reaches set temperature.