Viessmann GC1 - Fault Display

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Vitotronic 100, GC1B / Vitotronic 300-K, MW1B Installation and Service
Note: A fault message facility, if connected, will be
switched off.
If an acknowledged fault is not remedied, the fault
message will be re-displayed the following day and
the fault message facility restarted.
Calling up acknowledged fault messages
Press OK for approx. 4 sec.
Calling up fault codes from the fault memory (fault
history)
The 10 most recent faults (including those remedied) are
saved and can be called up.
Faults are sorted by date.
1. Press OK and
simultaneously for approx. 4 sec.
2. Select  with  and activate fault history with OK.
3. Select fault messages with .
Troubleshooting, Vitotronic 100
In the event of a fault, the red fault display flashes at the
control unit. The 2- digit fault code and  flash on the
display.
Note: If a central fault message facility is connected, this
is started.
Other current faults can be displayed with .
For an explanation of the fault code, see chapter “Fault
codes”.
Example:
Fault code “d1” burner fault
Acknowledging faults
Press OK; the standard display appears.
Fault Display