Cross Furnace Draft Inducer Blower 115 Volts Fasco # A064 "heil fan" Questions

Heil furnace (75,000 btu's) burner egnites for about 15 seconds then goes out fan continues to run. Wahts the problem? Dave Sound like a thermocouple, or flame sensor. If it has flame sensor make sure

heil 75kbtu gas furnace 80% efficiency installed winter 2004-2005 timeframe. the exhaust fan comes on and the green lite on the valve flashes green but the unit wont fire. a service tech asked if the ...