burners on furnace not firing

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Moderator Post (s) for this thread: > Flame Sensor by Billhart on 10/13/2007

I have a lennox whisper heat furnace MODEL NUMBER G20Q3E-75-2. The problem is when I turn my thermostate up I hear the blower turn on for a few seconds and then shut off. I then go into the basement to see what happens and find that it is doing nothing. I turn off the power switch and turn it back on to see if I can see anything and this is what happens. First I can hear the electronic ignition cliking and the piolet light lights. The ignition keeps clicking and after a few sec. the blower turns on. It runs for about 25 sec. and then the piolet light goes out and the blower shuts off. The burner never comes on. Then to make it do anyting again I have to shut the power to the furnace off again. If I do this about 4 times I can get the burners to lite up and it heats the house fine. When the furnace shuts off because the house is warm it then does the same thing over when it needs to turn back on to heat the house up again. Please HELP I am getting really cold. Thanks