Viessmann GC1 - Page 31

Troubleshooting guide
31
Diagnosis and correction Vitotronic 300-K, MW1S
If a fault occurs on the heating system, it will be indicated in the display
window and by the flashing red fault lamp (see page 5).
Using the scan facility, you can read off the fault code yourself and inform
your heating contractor accordingly.
Outdoor sensor
Acknowledge? Yes
1. Open the hinged cover on the
programming unit.
2. Press for fault search.
The error source is dis-
played in plain language
and in the form of a fault
code.
3. Press ; the display
changes to ”Acknowledge?
Yes”.
4.
/ Press / for ”Yes” or
”No”.
5. Press to confirm;
the display changes and
shows the boiler
temperature.
6. Close the hinged cover on the
programming unit.
Example
U
UU
U Fault display
1
11
1 Error number
1
11
1 Sensor designation
plug designation
Open circuit
or
Short circuit
Press ”Acknowledge?” to confirm
that you have noted the fault.
Please note:
The fault message will re-appear
at 7.00 hrs on the following day if
the fault is not corrected in the
meantime.
The red fault lamp continues to
flash until the fault has been
corrected.
To call up an acknowledged fault message
1.
Press for approx.
2 seconds.
2. / Press / to display
further faults.
The fault is displayed.
Only if two or more faults have
occurred.
5581 751 v1.1
DFault
Tu
°C
U