Exterior combo door freezing shut – GreenBuildingAdvisor

Hey GBA im having issues with my exterior combo door freezing shut at the seals,

Im located in canada climate zone 7, as it drops below 0 celcius my outer door freezes around the seals

My home is new construction, extremely air tight , ICF walls , close cell spray foam attic. Hrv controls the humidiy in the house and we adjust it to keep condensation from forming at the bottom of the windows

My original thought was that an improperly balanced hrv was causing a positive pressure inside the house, pushing warm air out the door seals. I had the hrv balanced  to neutral   and still had the same issue, now i have tried adjusting the hrv to be slightly negative pressure and im still having the freezing issue

this if a few other things ive tried

– leaving the window on the outer door open 

-putting  plastic window film on the inside window of the exterior door ( this helped with the freezing but didn’t solve it )

 

Any thoughts or ideas?