Operating instructions

Troubleshooting guide
31
Diagnosis and correction Vitotronic 100, GC1
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.
_1...38.
U
1. / Press / to display the
individual fault codes if sev-
eral faults have occurred
simultaneously.
2. Press to confirm;
the display changes and
shows the boiler tempera-
ture.
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.
To call up an acknowledged fault message
1. Press for approx. 2
seconds.
The fault code is displayed.
2. / Press / to display the
individual fault codes if
several faults have occurred
simultaneously.
Fault Cause Remedy
The boiler does not start up Heating system switch ”8” Switch on
Electrical isolator switch, if installed,
is switched off
Switch on electrical isolator switch
Fuse in the domestic power circuit or
in the control unit has blown or
tripped
Inform heating contractor
No heat request made via the
Vitocontrol-S, VD2/CT3/CM2
Check the setting on the
Vitocontrol-S, VD2/CT3/CM2
5351 341 v1.2