Follow these instructions to ensure that the Controller faceplate is safely removed and installed.
Brand new units, especially some of the very early units, may be very difficult to open due to the friction of the controller pins. Removing and reinstalling the faceplate a few times will break in the connection which will make it easier over time to remove and install.
When both removing and installing the faceplate, take care not to bend the controller pins. The best way to do this is the push or pull the faceplate directly in or out without tilting or angling the faceplate relative to the mounting bracket.