[lroettg]

I have Goodman Furnace model GMT 090- 3 installed in 1999 and it has 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 doesn't start. The diagnostics info on the panel says it's a pressure switch and to check the 'venter' for a blockage. I'm the 2nd owner and don't have a manual. What and where is the vinter and how does one check it or fix it? Thanks

[MarkwithaK]

The 'venter' or draft inducer is the small motor you see on the top of your furnace near the flue pipe (assuming it is an upflow furnace). As far as a blockage, well you can check the flue down stream. Could also be the inducer itself. Does it spin on a call for heat? Could be a failed pressure switch. The orifice on the pressure switch could have debris blocking it. There are many different options. Best bet is to call a local service tech on this one.

[camrec]

Just found out the expensive way,same thing,fan but no heat and shuts off after a few.turned out to simply be a clogged vacumum line from the fan to the limit switch,clean out the nipple on the fan.cost me $196 to find out,hope this will save $$