Changing The Label Cards - HomeMatic HM-RC-12-B Operating Manual

In this case, the encoding is active using a system security key
that differs from the key delivered with the system. In order to re-
set the remote control, you must use the configuration software
of the center for resetting! The procedure is described in the
center software instructions.
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Changing the label cards

First, open the battery compartment cover as described for
changing batteries. A red slider switch is located under the
batteries. Push the slider switch in direction 2.
Set the remote control down on the table in front of you with the
buttons facing up. Flip the button cover up and pull the cover out
of the device at an angle.
The lighting sheet can be accessed between the buttons now.
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