I have a 2004 Lennox model # G40DF-48C. My small lower blower motor will kick on for about 4 or 5 seconds then shuts down. Everything will work fine with the a/c on, only have problem with heat. Both red and green lights are alternating a fast flash. Is this the ignitor or do you have any other ideas?

I do not sell Lenox so I am not up on them but somewhere you should have a code information sheet that will tell you what the flashing means.