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So I've been frustrated trying to figure out a furnace issue. The inducer blower turns on but the igniter won't glow. After a while of troubleshooting, I figured out the igniter is fine but there doesn't seem to be enough airflow from the blower to close the pressure switch. I thought maybe the exhaust vent was clogged with a birds nest or something so I disconnected it (blowing exhaust gasses into the room. Voila! It works... barely. If I even reattach the elbow boot without connecting the exhaust pipe the flow seems to be restricted enough that the flames flicker and go out and the igniter won't glow again when it all tries to fire back up.

Could the inducer blower be getting weak and not pulling enough air? Sorry if this all makes no sense. I might missunderstand the system entirely and am overlooking a different issue.

It's getting aweful cold here in Utah! Thanks.
 

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If you have a condensing furnace, check the condensate lines and trap.

Could be the inducer but could also a bunch of other things. If the inducer motor gets very hot, likely has bad bearings.
 

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Check the intake pipe outside if you have one.
 
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