Furnace Problem

[SpongeBob]

We have a 7 year old Lennox Model 80MGF furnace and the following problem has recently started:

When the furnace starts up, the burner cycles for about 2-3 seconds then quits. Then it starts up again and the furnace works fine. Any ideas would be greatly appreciated.

[Dean]

Really need to be there with testing equipment to catch it in action but just a [u]guess</u> would be the flame sensor or Ignition Control Module starting to go bad.
Sometimes you can clean the flame sensor with steel wool or very fine sandpaper

[mr fix it man]

try changing filter first.