My 2017 ACE doesn't have louvers on the heater cover door, but that didn't prevent water from getting in. Water would get under the control board (mounted horizontally on a plastic shelf) and short out the pins.
The foam that Atwood uses on the door doesn't seal anything. I found some rubber weatherstrip that would fit in the groove the door fits in and now I'm water tight. I drilled some holes in the shelf to drain any water that might still get in and shimmed the board up a bit. Atwood will provide a control board relocation kit, but that involved a trip to CW because they won't ship one to an owner (only authorized service locations). My fix seems to be working.
2017 Thor ACE 30.1
2017 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain
RVi Brake 3