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
(Vitotronic050)
Download fault code
to user
Installation
and service
instructions
of the
relevant
control unit
No connection to
the user
Check coding
(see page99)
Check connecting
LON cable
Update user list
(see page99)
Carrying out a
user check
(see page100)
5862730GB
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