Robert, Seven flashes is: one hour ignition lockout - Burner failed to light in three tries - check gas flow, gas pressure, gas valve operation, flame sensor. I am confused because it stops working and flashes this code after it has been running properly for approximately 15 minutes. It then lights ...

My Coleman Furnace operates normally (burner lights with no problem) for roughly 15 minutes providing heat. It then shuts off prior to reaching the temperature set on the thermostat. When I look at the furnace diagnostic code, it flashes 7 times. After the one hour ignition lockout it starts up agai...