Theben Training Case KNX Manual page 27

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In the event of a device failure, "---" appears in the temperature display
(either RTC display or function=actual value).
Dismounting iON 104 – iON 108 devices
Since the button for programming the physical address is located on the back of
the device, the iON 104 KNX or iON 108 KNX devices may have to be dismounted
from the base plate.
This is necessary if
- a master reset is carried out on the device, or
- a new physical address is assigned to the device.
When dismounting, the device must be pulled - firmly but carefully - out of the
upper bracket and tilted slightly forwards.
Then it must be removed upwards from the snap-fit.
Manual for the training case KNX
KNX devices used in the case
27