I have a comfortmaker (4-5 years old) GNE075B12A2 with a honeywell sv9501m2056 that won't stay lit or turn on. The pilot will come on for one to two minutes and then it shuts off. it begins with a strong flame that dulls to a low blue flame before growing again and then extinguishing. While the blower works, the fan will not come on unless set to on at the thermostat. From reading here i am thinking its a malfunctioning sensor detecting an overheat in the heat box but...??? the field twinning connection wouldnt need to be reset, would it? its now at off on on (but i am understanding that only has to do with linking two furnaces? I am still hoping to find the magic switch that will restore heat.) There is no warm air and the fan doesnt run on auto, and only a weak draft comes through the vents from the blower. the ac worked all summer but no heat. i recently changed the filter. any suggestions would be greatly appreciated, if for nothing else, increasing my understanding of things that make my life somewhat comfortable.