14
LED indicators
LED
Status
Meaning
Measure
User LED U1
Green
The connection to the heat gen-
erator is active.
—
Red
The CAN bus interface has the
status "Bus Off": Short circuit or
other serious fault
■
Check CAN bus connection:
Plug, cable, terminator
■
Check whether heat generator
is switched on.
■
Check installation and connec-
tions of gateway and power
supply unit.
■
If the fault cannot be rectified,
contact Viessmann Werke
Technical Service.
Other
Fault
Contact Viessmann Werke Tech-
nical Service.
Power supply unit
A
B
L N PE
+ + - -
Fig. 6
A
INPUT
100 to 240 V, 50 to 60 Hz
B
OUTPUT 24 V
1.3 A
Installation sequence
Connections and operating elements
(cont.)
6175460
Installation