There Is No Hot Water; The Dhw Is Too Hot; Fault" Is Shown In The Display - Viessmann VITOTRANS 353 Operating Instructions Manual

What to do if...

There is no hot water

Cause
Control unit incorrectly set.
DHW cylinder is cold.
The DHW temperature and boiler water temperature
are too low.
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 in the display

Cause
Heating system fault
44
Remedy
Check the settings and correct if required:
DHW heating (must be switched on; see page 33)
■
DHW temperature (see page 33)
■
Time (see page 37)
■
Switching times (see page 33)
■
Check the switching times for DHW heating (see
page 33)
Check the set DHW temperature (see page 33)
Check the temperature of the DHW cylinder.
If this is too low: Heat up the boiler (see page 11)
Charge the boiler with fuel and bring it up to tempera-
ture (see page 11)
Check the heating times. If the pump is not running ac-
cording 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 33).
Check the actual temperatures. In the event of unusual
deviations: Notify your heating contractor.
Remedy
Check the type of fault (see page 39) and notify your
heating contractor.