I have Goodman Furnace model GMT 090- 3B installed 3 years ago and it gives me constant problem I just changed Hot surface ignitor last week and it was working good and it again stop working and when I open the cover of furnace I can see there is a red LED light that blinks three times and stops after a second or so it again blinks three times and stops this cycle is keep going, and furnace does't start.

Thanks
Joe

3 times on most goodmans I think is pressure switch,, it should have a pasted on sticker on the inside of door that tells you what each code means,, on a 3 year old goodman,, the parts should be covered under warranty,, they give a complete 5 yr on all parts