Rooms Are Too Hot; There Is No Hot Water - Viessmann VITODENS Operating Instructions Manual

Rooms are too hot

Cause
Control unit or room temperature control
unit incorrectly adjusted.
The " " symbol is shown on the display. Notify your heating contractor of the fault

There is no hot water

Cause
The heating system is OFF.
Control unit incorrectly adjusted.
No fuel.
Remedy
Check and correct settings if required:
■ Heating flow temperature (see
page 12)
or
Room temperature (see room temper-
ature controller operating instructions)
■ Time (see page 20 and room tempera-
ture controller operating instructions)
■ Time program (see page 13 and room
temperature controller operating
instructions)
code.
Acknowledge the fault message with OK
(see page 24).
Remedy
■ Switch the ON/OFF switch " " (see
page 10) ON.
■ Switch ON the mains isolator, if instal-
led (outside the boiler room).
■ Reset the MCB in the power distribution
board (main domestic MCB).
Check and correct settings if required:
■ DHW heating must be enabled (see
page 16).
■ DHW temperature (see page 16).
■ Time (see page 20)
■ Time program (see page 17).
For 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.
What to do if...
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