Viessmann VITOTRONIC 100 GC1B Operations Instructions Page 120

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120
Troubleshooting
Faults which are displayed at the programming unit (cont.)
LON users fault messages
Only if the control unit is the fault manager (code "79:1").
Fault
code
System
characteristics
Cause Remedy
01
to
98
Control mode A user fault has
occurred, e.g. 12
(Vitotronic050)
Download fault code
to user
Installation
and service
instructions
of the
relevant
control unit
No connection to
the user
Check coding
(see page99)
Check connecting
LON cable
Update user list
(see page99)
Carrying out a
user check
(see page100)
5862730GB
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