There Is No Hot Water; The Dhw Is Too Hot; Fault" Is Shown On The Display - Viessmann VITOLIGNO 300-C Operating Instructions Manual

What to do if...

There is no hot water

Cause
Control unit incorrectly set.
DHW cylinder is cold.
The DHW cylinder pump is not running.
Mixing valve faulty

The DHW is too hot

Cause
Control unit incorrectly set.
Sensor fault

"Fault" is shown on the display

Cause
Heating system fault
44
Remedy
Check the settings and correct if required:
DHW heating must be on (see page 26)
■
DHW temperature (see page 26)
■
Time (see page 36)
■
Switching times (see page 26)
■
Check the DHW heating times (see page 26)
Check the set DHW temperature (see page 26)
If the heating times are OK: Check the temperature of
the DHW cylinder.
If it is too low: Notify your heating contractor.
Check the heating times. If the pump is supposed to be
running according to the times set in the control unit:
Notify your heating contractor.
Notify your heating contractor.
Remedy
Check and correct the DHW temperature if required
(see page 26).
Notify your heating contractor.
Remedy
Check the type of fault (see page 39) and notify your
heating contractor.