ACtechGUY
Master Appliantologist
| Joined: | Sun Sep 27th, 2009 |
| Location: | New Orleans, Louisiana USA |
| Posts: | 137 |
| Flavorite Brew: | Landshark |
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The rusting out of the blower wheels is due to the nature of exhaust gases. When the gas burns one of the main byproducts is water vapor , and many manufactures do not use a stainless steel wheel when they really should. Thus overtime the regular steel wheels do rust out. 
Like handyrandy said , check that the tube that goes into the inducer assembly is clear, intact and open. That is very important. Also Check that it is does not have rust holes in the pipe. If it does not have a square edge, proper suction will not be created.
I had this very situation on a lennox furnace. I was not getting enough vacume to pull in the pressure switch I looked at the wheel, It was perfect, checked the vent pipe , it was clear, so I say " It's gotta be the pressure switch!!!" .
Well it wasn't the switch and I should have checked the pressure first with my Magnehelic before running across town for a switch. 
It turned out to be a the STEEL tube that was part of an otherwise stainless inducer assembly was rusted away ON THE BOTTOM(where I could not see). This was not allowing the vacume to be created. I Cut a 1/4" piece of 1/4" copper tube and placed over the original rusted tube to fix the problem.(replacing the whole induced assembly whould have done the job too).
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Don't know much. But learned early on, once you let the smoke out of a something electrical, you can never put it back in!!
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LOOK AT THE IGNITOR. If it not a nice uniform dark color it is probably bad. If it has ANY trace of white powder on it. IT IS BAD.
