thanks robert,i found the flame sensor carboned up some,took some embry cloth and cleaned it up and everything seems to be working ok now.

hi,this is my problem.the furnace is running ok,but, if i set the thermostat to a lower temp.,when the temp in house drops to new setting and below,the furnace won't start,and i get 4 flashes on red light on furnace panel ,that says ignition failure,if i then lower thermostat setting and then increa...