+1
I too had an issue with the primary air door not fully closing. I took it apart and investigated. Found the cable for the air control was a bit hung up on a casting edge. Fixed that and now it closes fully with a "click" if I move the air lever closed quickly.
Dis-assembly is easy:
- Take the airwash manifold out (part #58 on exploded part diagram; above doors)
- Take right side refractory plate out (remove clip at top of plate)
- Take right side air manifold out (part #31)
Now you have access and full view of the thermostat assy and the cable. From here, its easy and intuitive to see if there are problems. If needed, the cable can be adjusted using the allen screw on the back side of the air door.
You might want to investigate further. My stove had 4 separate issues all leading to extra air getting into the stove: Ash pan latch was too loose. I found play in the ash door casting even when latched. So I adjusted the ash door latch tighter. Then I found the door glass (both) to be loose enough to where I could move the glass around. I bent a small amount of pre-load into the glass keepers so they'd press just a little harder against the glass. Fixed that. Then I took the air damper housing (parts blowup #18) out and found the housing gasket completely out of place. Glued the gasket in place with stove gasket cement and reassembled. Fixed. Finally I found the primary air door not fully closing.
Now I have a TIGHT stove. It runs like it should. Really really nice control over running temps.