Help! I have replaced the draft inducer motor assembly two times since January 2009. It is failing (squealing) again. When it's squealing it doesn't produce enough pressure to set the pressure switch and it will eventually fail entirely. I suspect it may be getting excessive moisture, however the drain system seems to be functioning correctly. This furnace was purchased in 2002 and the first draft inducer started failing just after it was 5 years old. Any ideas why this is happening? Thank you for any help.