Diagnosis And Correction - Viessmann Vitotronic 100, GC1 Operating Instructions And User's Information Manual

Diagnosis and correction

_1...38.
U
Fault
The boiler does not start up
If a fault occurs on a boiler, it will be indicated in the display window and by
the flashing red fault lamp.
In the display window you can read off the fault code yourself and inform your
heating contractor accordingly.
/ Press / to display the
1.
individual fault codes if sev-
eral faults have occurred
simultaneously.
Press to confirm;
2.
the display changes and
shows the boiler tempera-
ture.
To call up an acknowledged fault message
Press for approx. 2
1.
seconds.
/ Press / to display the
2.
individual fault codes if
several faults have occurred
simultaneously.
Cause
Heating system switch "8"
Electrical isolator switch, if installed,
is switched off
Fuse in the domestic power circuit or
in the control unit has blown or
tripped
No heat request made via the
Vitocontrol-S, VD2/CT3/CM2
Troubleshooting guide
Vitotronic 100, GC1
Please note:
The fault message will re-appear
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.
The fault code is displayed.
Remedy
Switch on
Switch on electrical isolator switch
Inform heating contractor
Check the setting on the
Vitocontrol-S, VD2/CT3/CM2
31