Continued from above. Well, I thought for sure that was the issue, but I got the fan fixed, installed new gaskets, and that didn't help. The transformer is putting out 27.7 vac. I then noticed a the tell tale sign of a component problem. When the board has two red flashes, I noticed a high pitch sou...

Woohoo Robert, I found the problem! The upper draft fan was so loose that it was close to falling off. I pushed it down on the shaft and it's now tight and spins beautifully. If it happens again, I'll epoxy it to the shaft. Also, the upper and lower draft housing gaskets are almost non-existent. I'm...

Ok, thanks. I'll check it out tomorrow.

- Why is it called water column pressure? EDIT: Never mind, I found out

- I already tried replacing the switch with a new loaner from the installer.

My last post was a little confusing, but I spoke too soon, as simply turning the power switch on and off was only a coincidence that the furnace then fired up. So, I checked and there is 24vac to the switch, and the tubes are tight and in excellent condition. I've concluded that the switch isn't get...

Thanks Robert. As a computer tech for 5+ years, I understand your conclusion of "Or none of the above". Anyway, it seems I've got an inducer venting issue, or a main board issue. The latter is becoming conclusive, as with further troubleshooting, the system will clear the error code and ru...

Hello: - Draft motor turns on, but furnace fails to start. - 2 red flashes show the pressure switch is stuck open. - Borrowed a pressure switch from the place that installed it, but that didn't help. - Furnace will strike out, wait about 15 minutes, strike out again, wait another 15 minutes, then st...