This past weekend we purchased a US stove 5502m king stove. Stove works great but if the stove runs in auto mode the draft light keeps blinking. IF we change the draft to 2 or more it shuts off but then the fire is not roaring like it should- almost looks like it goes out and then comes back on. All blowers work fine. Why is the draft light doing this? Also after 1 day of running on H3 for cleanout the glass is dirty- is this normal? Now we also hear a slight vibration in the turn on phase however it stops after a 2nd or two. help please thanks