Now with video!!!
https://youtu.be/NZv13KVWUf4
Two weeks ago, it fired up around 2am, had a funny smell. Then went off. Next morning, blower would run but no spark. Then blower off after 15 seconds and blinking LED once per second - meaning air flow/high limit.
Checked ducts for kinks and obstructions.
Used shopvac to blow air *into* the ducts and try to clear any obstructions.
Now, as you can see/hear in the video - blower starts and ignititor sparks - we get about 1 second of flame, then flame out.
Nothing in the exhaust tube looks like a mud dauber. I did hook up shop vac to exhaust tube and *suck* to see if there was anything in there. No help.
Doesn't look like an easy access from the rear.
I'm hoping I don't have to pull the #$#@@! out.
This is season 2 for the furnace, worked fine before.
Ideas?
thanks!