1 year old Goodman GMH81155CN Gas Furnace problem
 

I have a
Goodman GMH81155CN Gas Furnace

115,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 2,000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

as of last night these have been the symptoms:

1 click
2 click
3 click - RED LED at the bottom motor circuit board comes on
4 click - RED LED is still on
5 click - sounds like a double click and exhaust motor comes on the RED LED is still on, but after 2 - 3 seconds the exhaust motor cuts off, RED LED turns off, and the cycle repeats after about 2-3 seconds.


The unit is less than two years old, no wires are loose anywhere, everything looks clean and dandy on a visual inspection.



I pulled the fault codes and got these two codes:
3 - pressure switch stuck open
4 - open high limit

according to this site I checked the high limit switch, i get continuity.
IHateMyFurnace.Com we'll help you get along with your furnace. - and according this site its working just fine.

The pressure switch i did a visual check and everything looks ok.

Please assist