Could the problem be too much space under the base. I know they get their air from around the door. But if there was a big gap under the base then it would be easier to draw the air from there keeping the little door from shutting.
Both units are on a concret slab, they are identical installs
Just throwing out another thought. Is the ash cone properly sealed? A few members on here have reported a "lazy burn" from air leaks around the ash cone: Build Up In The AA-130 Ash Cone
As far as I can see the ash cones are welded in place and not removerable but are clear
whistlenut wrote:What is the base on? Is it a concrete floor in both applications? Somehow air is finding a path of least resistance.
You have swapped out the blower assemblies and they both seem work just fine. That should eliminate the possibility of a motor running backwards on one, but not the other. You should check rotation with them out so you can verify they are both correct. I can't understand how you could reverse a single phase 115 v motor, anyway, but it MUST be checked.
It is possible that the original factory wiring wasn't correct.
I've never heard of this problem with any AA or AHS, ever, so something is definitely not correct. Check the wiring and the possibility that mounting may be letting in too much air from below.
Rotation was the first I checked on both units, I figured this was an unlikely problem but checked it anyway.
I have done a lot of reasearch on the aa 130 and ash 130 before I bougth my stokers and had nothing but great reviews on both, but I have 2 with identical installs, one is working great and on is not. Jeff at AHS is kind of stumped himself and so am I. It's kind of basic on how this stoker works.