Thanks for all your input. We have determined the cause of the smoke and it was NOT the soffit (although we will be extending the termination vent anyway - I told my husband I want to add two feet to it.) Yes, the window is open - we opened about ten windows throughout the house to vent it but it is not usually open. There are no electrical wires near the vent - they are stakes/caging for planting vegetables in the summer. The cap is not made with the thimble - there is some pipe there but not enough in my opinion. CapeMayDan, I think you are right about the vent and we will fix that when we extend it. The "pro" who installed it installed black pipe inside the house and silver outside and I think he transitioned right at the wall. My husband said it didn't seem right but the pro said it was fine. There is a 90 elbow on the inside of the wall and we will get a straight shot of vent from there to a foot or two past the edge of the soffit. By the way, is there any reason we can't use the black vent pipe outside? Do we need to switch over to silver?
So, what caused the smoke? It seems to be just bad timing. Since we turned the stove off due to the smoke, we cleaned it when it cooled off. There were many unburned and partially burned pellets in the pan. It appears as if we had a little blip with the power just when the stove was starting up (when there is smoke inside) and it caused the stove to dump the partially burned pellets, turn off and reset. We did not have an error code but we believe the smoke exited the pan, etc. It happened once before when we had the same issue. We do have the battery back-up but it didn't have time to kick in before the power resumed (it was that quick) and the fire wasn't already going, just starting. We are still definitely fixing that vent termination (or the shop will - not the "pro" though - he's never coming back here).
You are all so informative and I have learned so much just from this post. I think with all your input we will get this done right. The stove has been working fine it's just the "professional installation" that's had issues. Thank you all
So, what caused the smoke? It seems to be just bad timing. Since we turned the stove off due to the smoke, we cleaned it when it cooled off. There were many unburned and partially burned pellets in the pan. It appears as if we had a little blip with the power just when the stove was starting up (when there is smoke inside) and it caused the stove to dump the partially burned pellets, turn off and reset. We did not have an error code but we believe the smoke exited the pan, etc. It happened once before when we had the same issue. We do have the battery back-up but it didn't have time to kick in before the power resumed (it was that quick) and the fire wasn't already going, just starting. We are still definitely fixing that vent termination (or the shop will - not the "pro" though - he's never coming back here).
You are all so informative and I have learned so much just from this post. I think with all your input we will get this done right. The stove has been working fine it's just the "professional installation" that's had issues. Thank you all