Electrolux ERN 1573 Instruction Book page 19

Fix cover (Hd) on guide (Hb) until it clips into place.
After completion of the door reversing operation,
check that the door gasket adheres to the
cabinet. If the ambient temperature is cold (i.e. in
Winter), the gasket may not fit perfectly to the
cabinet. In that case, wait for the natural fitting of
the gasket or accelerate this process by heating
up the part involved with a normal hairdryer on a
low setting.