Viessmann GC1 - OFF Is Displayed at the Vitotronic 100

46
Cause Remedy
Control unit incorrectly adjusted. Check and correct the DHW temperature,
if required (see page 29).
DHW heating is carried out by the solar
thermal system.
Check and correct settings, if required, at
the solar control unit.
Separate operating instructions
Emissions test mode is enabled. Terminate emissions test mode (see
page 42).
"OFF" is displayed at the Vitotronic 100
Cause Remedy
The heating program is enabled or the
boiler is shut down externally.
Set the heating program .
If necessary, notify your heating contrac-
tor.
"
ë
" is displayed at the Vitotronic 100
Cause Remedy
The time for a service, as specified by
your heating contractor, has arrived.
Proceed as described on page 39.
"ã" is displayed at the Vitotronic 100
Cause Remedy
Heating system fault. Proceed as described on page 40.
"ã" flashes and "Fault" is displayed at the Vitotronic 300-K
Cause Remedy
Heating system fault. Proceed as described on page 40.
What to do if...
The DHW is too hot
5592 675 GB