TFC Group Trealux 710 - Manual (Page 5)

2. Putting into operation/operation 5
GB
b) Caretaker function
Press the switch in the stairwell
for approx. 3 seconds = for 1 hour (100%)
Note:
If any key is pressed in the stairwell during this hour,
you switch OFF the lighting immediately.
2.4 Diagnosis
a) Pushbutton in the stairwell – monitoring function
If one of the switch in the stairwell is pressed, the display appears.
If this symbol is constantly displayed, one or more switch may be blocked
or possibly faulty.