7106A Auto Switched Louvres will not open in due time.
If you ran the unit before you put the front cover on.
Thermal actuator in main unit has not married up with louvre mechanism in the front cover. The thermal actuator is likely extended now, wait for it to drop down (3 mins) and try again, re fitting the cover.
Open the louvres with a flat blade, to position the mechanism on the actuator to the louvres whilst it's still warm.