If the wind is out of the south I have that problem. I bought one of these to start the fire. It puts off enough heat to make it draft until the fire gets hot enough. Fixed my problem.
My fireplace has the same issue. Try starting a fire and basically fill the living room with smoke. It’s a complete PITA to get a fire start, which I guess if cause it’s not getting enough oxygen. The back of my house where the flue comes out faces North.
Raise your fire rack a little and start with a small fire until the flue gets heated up. Just a few suggestions to help without spending a bunch of money.
Check damper position ( i know that sounds lame). Most inserts have an inlet air. Should look like a dryer vent outside. Make sure that is not plugged by a rat or bird nest. Triple and double insulated pipe takes a bit to get warm. So start with small fire and doors nearly closed.
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