Just in case your board doesn't show the labels any longer please use this.

 

I ordered a new IFC from Repair Clinic and installed today and my furnace started properly. Thanks Pete for your input on eliminating parts to replace. Upon inspection again of my old board you'll see that it appears to be the ground circuit path that fried. My guess is that when I installed my new blower assembly my ground wasn't good enough or tight enough. I'll keep this board as a back up and repair the circuit board path. I tried putting my old motor on but could get the squirrel cage to slide off the shaft so I'll keep my old motor as a back up as well. Thanks again for all the input.

 

I'm bringing back my thread from early this year as I started hearing my fan noise again. This is like deja vu. 11 months ago I noticed that when my blower kicks on that the blower started making a noise that continued to get louder over time (not by a few minutes but over a course of several days.). Thinking that my 15 yr old motor had a bad bearing, I ordered a new motor and installed it but upon the first start up the new motor made the same noise and just as loud as the old motor. I pulled it several times back out to see if the squirrel cage was rubbing but it wasn't. The next thing that happened was my IFC failed which then led me on a diagnostic check of every circuit and sensor because my unit wouldn't fire. It was after pulling the IFC out and seeing that the circuit was fried on the ground side, I put in a new IFC and the unit fired but I still had the fan noise. Then all of a sudden that fan noise stopped completely. The unit ran quietly all summer and up until a few days ago but now is starting to make the same exact noise it made 11 months ago.

I'm at a loss for the cause. The blower housing is tight and when I spin the squirrel cage manually with the power off, it doesn't make any noise. I didn't replace the capacitor but I would think that it either works or it doesn't. I have heat and everything is working but the fan noise is growing louder.

Any ideas or thoughts?

 

Now just a few days since my last post, the blower is getting really loud when running. I pulled the lower cover tonight and with the power off to the unit I can tell that the motor shaft has some play, maybe 1/8 to 1/4 inch and the whole squirrel cage is vibrating. Repaircliniic is sending me a new blower motor but my last one lasted less than 12 months. If my cage is out of balance, can it be rebalanced?