Viessmann VITOTRONIC 100 Operating Instructions Manual page 28

What to do if...
There is no hot water
Cause
"Burner fault" is displayed.
"External hook-up" enabled.
"External program" enabled.
The DHW is too hot
Cause
The control unit is set incorrectly.
The DHW is being heated by the solar thermal system.
28
(cont.)
Remedy
Vitotronic 100, type CC1E:
■
Press the reset button at the boiler burner control
unit. You can access the reset button via an opening
in the outer panel.
See separate boiler or burner instructions.
Vitotronic 100, type CC1I:
■
Follow the instructions on the display: See page 22.
Contact your contractor if the burner still fails to start.
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not acknowledge fault messages several
times in quick succession. Notify your contractor
if a fault recurs. Your contractor will be able to
analyse the cause and rectify the fault.
No action required.
The operating program set at the control unit was e.g.
changed over via an externally connected button.
Example: In a school, heating demand exists outside of
school times, e.g. for a parents' evening.
This function cannot be influenced via the control unit.
Once the external changeover no longer applies, the
set operating program becomes active again.
The operating program set at the control unit has been
changed over by another control device. E.g., by your
mobile phone using your Viessmann app.
You can change the operating program on the
Vitotronic control unit.
Remedy
Check and correct the DHW temperature if required
(see page 16).
Check the settings at the solar control unit and correct
them if required.
Separate operating instructions