Another newbie question for everyone. We have a 2021 coleman lantern 262bh, I'm new to rv'ing. I've noticed since I bought the unit when I open the freezer there is an ammonia smell. It does not smell in fridge. We have never used the freezer and it hasn't been on yet other than to confirm the gas and electrical work the fridge. I planned to turn it on today in preparation for a trip this weekend. Is this normal for a new unit and if I clean it and leave the door open will it dissipate? Thanks!