Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble. ) Q( a. M: X% a1 h! Y # l9 H g$ V% Y$ L1 a# W( B) lIf it does have mold and can not be wipe out, then you have to change out the whole seal.. I bought a new seal and changed out few weeks ago.