Rooms Are Too Cold; Rooms Are Too Hot - Viessmann VITODENS 111-W Operating Instructions Manual

What to do if...

Rooms are too cold

Cause
The heating system is off.
Control unit or room temperature controller incorrectly
adjusted.
Only when operating with DHW heating:
DHW priority is enabled (" " is displayed).
No fuel.
" " is shown on the display.
" " and the fault code flash on the display. The burner
does not start.
Air in the heating system.
The burner is switched off. Blockage in the ventilation
air supply or flue system.

Rooms are too hot

Cause
Control unit or room temperature controller incorrectly
set.
" " is shown on the display.
16
Remedy
Turn ON the ON/OFF switch " " (see figure on
■
page 8).
Switch ON the mains isolator if installed (outside the
■
boiler room).
Set the MCB in the power distribution board (main do-
■
mestic MCB).
Operation with room temperature controller:
■
Set a higher boiler water temperature (see page 12).
Weather-compensated operation:
■
Set a higher room temperature (see page 12).
Wait until the DHW cylinder has been heated up (" "
disappears).
In the case of operation with an instantaneous water
heater, stop DHW draw-off.
With LPG:
Check the fuel reserves and re-order if required.
For natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
Notify your heating contractor of the fault code shown.
Reset burner fault (see page 18).
Notify your heating contractor if the fault recurs.
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner fault several times in
quick succession. Notify your heating contractor
if a fault recurs. Your heating contractor will be
able to analyse the cause and rectify the fault.
Bleed radiators.
Notify your local heating contractor.
Remedy
Check and correct the room temperature or boiler water
temperature (see page 12)
Room temperature controller operating instruc-
tions
Inform your heating contractor of the fault code.