There Is No Hot Water - Viessmann VITODENS Operating Instructions Manual

There is no hot water

Cause
The heating system is off.
■ Control unit incorrectly adjusted.
■ The remote control (if installed) is set
incorrectly.
Separate operating instructions
No fuel.
"Fault" is displayed. The red fault indica-
tor flashes.
The DHW is too hot
Cause
The control unit is incorrectly adjusted.
The DHW is being heated by the solar
thermal system.
Remedy
■ Turn on the ON/OFF switch (see dia-
grams from page 22).
■ Switch on the mains isolator if installed
(outside the boiler room).
■ Reset the MCB in the power distribution
board (main domestic MCB).
DHW heating must be enabled.
Check settings and correct if required:
■ Operating program (see page 31)
■ DHW temperature (see page 31)
■ Time program DHW heating (see
page 31)
■ Time (see page 36)
With oil/LPG:
Check the fuel reserves and re-order if
required.
With natural gas:
Open the gas shut-off valve. If necessary,
check with your gas supply utility.
Check what type of fault it is. Acknowl-
edge the fault (see page 41). If necessa-
ry, notify your heating contractor.
Remedy
Check and correct the DHW temperature
if required (see page 31)
Check and correct settings, if required, at
the solar control unit.
Separate operating instructions
What to do if...
47